diff --git a/test/pleroma/web/activity_pub/activity_pub_controller_test.exs b/test/pleroma/web/activity_pub/activity_pub_controller_test.exs
index b577e25dd..c9b421489 100644
--- a/test/pleroma/web/activity_pub/activity_pub_controller_test.exs
+++ b/test/pleroma/web/activity_pub/activity_pub_controller_test.exs
@@ -431,7 +431,7 @@ test "cached purged after activity deletion", %{conn: conn} do
 
   describe "/inbox" do
     test "it inserts an incoming activity into the database", %{conn: conn} do
-      data = File.read!("test/fixtures/mastodon-post-activity.json") |> Poison.decode!()
+      data = File.read!("test/fixtures/mastodon-post-activity.json") |> Jason.decode!()
 
       conn =
         conn
@@ -459,7 +459,7 @@ test "it inserts an incoming activity into the database" <>
 
       data =
         File.read!("test/fixtures/mastodon-post-activity.json")
-        |> Poison.decode!()
+        |> Jason.decode!()
         |> Map.put("actor", user.ap_id)
         |> put_in(["object", "attridbutedTo"], user.ap_id)
 
@@ -476,7 +476,7 @@ test "it inserts an incoming activity into the database" <>
     end
 
     test "it clears `unreachable` federation status of the sender", %{conn: conn} do
-      data = File.read!("test/fixtures/mastodon-post-activity.json") |> Poison.decode!()
+      data = File.read!("test/fixtures/mastodon-post-activity.json") |> Jason.decode!()
 
       sender_url = data["actor"]
       Instances.set_consistently_unreachable(sender_url)
@@ -534,8 +534,8 @@ test "accept follow activity", %{conn: conn} do
     test "without valid signature, " <>
            "it only accepts Create activities and requires enabled federation",
          %{conn: conn} do
-      data = File.read!("test/fixtures/mastodon-post-activity.json") |> Poison.decode!()
-      non_create_data = File.read!("test/fixtures/mastodon-announce.json") |> Poison.decode!()
+      data = File.read!("test/fixtures/mastodon-post-activity.json") |> Jason.decode!()
+      non_create_data = File.read!("test/fixtures/mastodon-announce.json") |> Jason.decode!()
 
       conn = put_req_header(conn, "content-type", "application/activity+json")
 
@@ -564,7 +564,7 @@ test "without valid signature, " <>
     setup do
       data =
         File.read!("test/fixtures/mastodon-post-activity.json")
-        |> Poison.decode!()
+        |> Jason.decode!()
 
       [data: data]
     end
@@ -747,7 +747,7 @@ test "it removes all follower collections but actor's", %{conn: conn} do
 
       data =
         File.read!("test/fixtures/activitypub-client-post-activity.json")
-        |> Poison.decode!()
+        |> Jason.decode!()
 
       object = Map.put(data["object"], "attributedTo", actor.ap_id)
 
diff --git a/test/pleroma/web/activity_pub/mrf/object_age_policy_test.exs b/test/pleroma/web/activity_pub/mrf/object_age_policy_test.exs
index cf6acc9a2..e8317b2af 100644
--- a/test/pleroma/web/activity_pub/mrf/object_age_policy_test.exs
+++ b/test/pleroma/web/activity_pub/mrf/object_age_policy_test.exs
@@ -22,7 +22,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.ObjectAgePolicyTest do
 
   defp get_old_message do
     File.read!("test/fixtures/mastodon-post-activity.json")
-    |> Poison.decode!()
+    |> Jason.decode!()
   end
 
   defp get_new_message do
diff --git a/test/pleroma/web/activity_pub/transmogrifier/accept_handling_test.exs b/test/pleroma/web/activity_pub/transmogrifier/accept_handling_test.exs
index c6ff96f08..0d431df18 100644
--- a/test/pleroma/web/activity_pub/transmogrifier/accept_handling_test.exs
+++ b/test/pleroma/web/activity_pub/transmogrifier/accept_handling_test.exs
@@ -22,7 +22,7 @@ test "it works for incoming accepts which were pre-accepted" do
 
     accept_data =
       File.read!("test/fixtures/mastodon-accept-activity.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("actor", followed.ap_id)
 
     object =
@@ -52,7 +52,7 @@ test "it works for incoming accepts which are referenced by IRI only" do
 
     accept_data =
       File.read!("test/fixtures/mastodon-accept-activity.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("actor", followed.ap_id)
       |> Map.put("object", follow_activity.data["id"])
 
@@ -76,7 +76,7 @@ test "it fails for incoming accepts which cannot be correlated" do
 
     accept_data =
       File.read!("test/fixtures/mastodon-accept-activity.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("actor", followed.ap_id)
 
     accept_data =
diff --git a/test/pleroma/web/activity_pub/transmogrifier/announce_handling_test.exs b/test/pleroma/web/activity_pub/transmogrifier/announce_handling_test.exs
index 99c296c74..c06bbc5e9 100644
--- a/test/pleroma/web/activity_pub/transmogrifier/announce_handling_test.exs
+++ b/test/pleroma/web/activity_pub/transmogrifier/announce_handling_test.exs
@@ -36,7 +36,7 @@ test "it works for incoming honk announces" do
   end
 
   test "it works for incoming announces with actor being inlined (kroeg)" do
-    data = File.read!("test/fixtures/kroeg-announce-with-inline-actor.json") |> Poison.decode!()
+    data = File.read!("test/fixtures/kroeg-announce-with-inline-actor.json") |> Jason.decode!()
 
     _user = insert(:user, local: false, ap_id: data["actor"]["id"])
     other_user = insert(:user)
@@ -55,7 +55,7 @@ test "it works for incoming announces with actor being inlined (kroeg)" do
   test "it works for incoming announces, fetching the announced object" do
     data =
       File.read!("test/fixtures/mastodon-announce.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("object", "http://mastodon.example.org/users/admin/statuses/99541947525187367")
 
     Tesla.Mock.mock(fn
@@ -90,7 +90,7 @@ test "it works for incoming announces with an existing activity" do
 
     data =
       File.read!("test/fixtures/mastodon-announce.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("object", activity.data["object"])
 
     _user = insert(:user, local: false, ap_id: data["actor"])
@@ -113,7 +113,7 @@ test "it works for incoming announces with an existing activity" do
   test "it works for incoming announces with an inlined activity" do
     data =
       File.read!("test/fixtures/mastodon-announce-private.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
 
     _user =
       insert(:user,
@@ -144,7 +144,7 @@ test "it rejects incoming announces with an inlined activity from another origin
 
     data =
       File.read!("test/fixtures/bogus-mastodon-announce.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
 
     _user = insert(:user, local: false, ap_id: data["actor"])
 
@@ -157,7 +157,7 @@ test "it does not clobber the addressing on announce activities" do
 
     data =
       File.read!("test/fixtures/mastodon-announce.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("object", Object.normalize(activity).data["id"])
       |> Map.put("to", ["http://mastodon.example.org/users/admin/followers"])
       |> Map.put("cc", [])
diff --git a/test/pleroma/web/activity_pub/transmogrifier/answer_handling_test.exs b/test/pleroma/web/activity_pub/transmogrifier/answer_handling_test.exs
index e7d85a2c5..a1c2ba28a 100644
--- a/test/pleroma/web/activity_pub/transmogrifier/answer_handling_test.exs
+++ b/test/pleroma/web/activity_pub/transmogrifier/answer_handling_test.exs
@@ -31,7 +31,7 @@ test "incoming, rewrites Note to Answer and increments vote counters" do
 
     data =
       File.read!("test/fixtures/mastodon-vote.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Kernel.put_in(["to"], user.ap_id)
       |> Kernel.put_in(["object", "inReplyTo"], object.data["id"])
       |> Kernel.put_in(["object", "to"], user.ap_id)
@@ -66,7 +66,7 @@ test "outgoing, rewrites Answer to Note" do
     # TODO: Replace with CommonAPI vote creation when implemented
     data =
       File.read!("test/fixtures/mastodon-vote.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Kernel.put_in(["to"], user.ap_id)
       |> Kernel.put_in(["object", "inReplyTo"], poll_object.data["id"])
       |> Kernel.put_in(["object", "to"], user.ap_id)
diff --git a/test/pleroma/web/activity_pub/transmogrifier/audio_handling_test.exs b/test/pleroma/web/activity_pub/transmogrifier/audio_handling_test.exs
index 6eeb1c863..7a2ac5d4d 100644
--- a/test/pleroma/web/activity_pub/transmogrifier/audio_handling_test.exs
+++ b/test/pleroma/web/activity_pub/transmogrifier/audio_handling_test.exs
@@ -53,7 +53,7 @@ test "Funkwhale Audio object" do
         }
     end)
 
-    data = File.read!("test/fixtures/tesla_mock/funkwhale_create_audio.json") |> Poison.decode!()
+    data = File.read!("test/fixtures/tesla_mock/funkwhale_create_audio.json") |> Jason.decode!()
 
     {:ok, %Activity{local: false} = activity} = Transmogrifier.handle_incoming(data)
 
diff --git a/test/pleroma/web/activity_pub/transmogrifier/block_handling_test.exs b/test/pleroma/web/activity_pub/transmogrifier/block_handling_test.exs
index 71f1a0ed5..b8e4ad827 100644
--- a/test/pleroma/web/activity_pub/transmogrifier/block_handling_test.exs
+++ b/test/pleroma/web/activity_pub/transmogrifier/block_handling_test.exs
@@ -16,7 +16,7 @@ test "it works for incoming blocks" do
 
     data =
       File.read!("test/fixtures/mastodon-block-activity.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("object", user.ap_id)
 
     blocker = insert(:user, ap_id: data["actor"])
@@ -36,7 +36,7 @@ test "incoming blocks successfully tear down any follow relationship" do
 
     data =
       File.read!("test/fixtures/mastodon-block-activity.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("object", blocked.ap_id)
       |> Map.put("actor", blocker.ap_id)
 
diff --git a/test/pleroma/web/activity_pub/transmogrifier/chat_message_test.exs b/test/pleroma/web/activity_pub/transmogrifier/chat_message_test.exs
index 31274c067..2adaa1ade 100644
--- a/test/pleroma/web/activity_pub/transmogrifier/chat_message_test.exs
+++ b/test/pleroma/web/activity_pub/transmogrifier/chat_message_test.exs
@@ -53,7 +53,7 @@ test "handles chonks with attachment" do
     test "it rejects messages that don't contain content" do
       data =
         File.read!("test/fixtures/create-chat-message.json")
-        |> Poison.decode!()
+        |> Jason.decode!()
 
       object =
         data["object"]
@@ -79,7 +79,7 @@ test "it rejects messages that don't contain content" do
     test "it rejects messages that don't concern local users" do
       data =
         File.read!("test/fixtures/create-chat-message.json")
-        |> Poison.decode!()
+        |> Jason.decode!()
 
       _author =
         insert(:user, ap_id: data["actor"], local: false, last_refreshed_at: DateTime.utc_now())
@@ -97,7 +97,7 @@ test "it rejects messages that don't concern local users" do
     test "it rejects messages where the `to` field of activity and object don't match" do
       data =
         File.read!("test/fixtures/create-chat-message.json")
-        |> Poison.decode!()
+        |> Jason.decode!()
 
       author = insert(:user, ap_id: data["actor"])
       _recipient = insert(:user, ap_id: List.first(data["to"]))
@@ -115,7 +115,7 @@ test "it fetches the actor if they aren't in our system" do
 
       data =
         File.read!("test/fixtures/create-chat-message.json")
-        |> Poison.decode!()
+        |> Jason.decode!()
         |> Map.put("actor", "http://mastodon.example.org/users/admin")
         |> put_in(["object", "actor"], "http://mastodon.example.org/users/admin")
 
@@ -127,7 +127,7 @@ test "it fetches the actor if they aren't in our system" do
     test "it doesn't work for deactivated users" do
       data =
         File.read!("test/fixtures/create-chat-message.json")
-        |> Poison.decode!()
+        |> Jason.decode!()
 
       _author =
         insert(:user,
@@ -145,7 +145,7 @@ test "it doesn't work for deactivated users" do
     test "it inserts it and creates a chat" do
       data =
         File.read!("test/fixtures/create-chat-message.json")
-        |> Poison.decode!()
+        |> Jason.decode!()
 
       author =
         insert(:user, ap_id: data["actor"], local: false, last_refreshed_at: DateTime.utc_now())
diff --git a/test/pleroma/web/activity_pub/transmogrifier/delete_handling_test.exs b/test/pleroma/web/activity_pub/transmogrifier/delete_handling_test.exs
index c9a53918c..cffaa7c44 100644
--- a/test/pleroma/web/activity_pub/transmogrifier/delete_handling_test.exs
+++ b/test/pleroma/web/activity_pub/transmogrifier/delete_handling_test.exs
@@ -25,7 +25,7 @@ test "it works for incoming deletes" do
 
     data =
       File.read!("test/fixtures/mastodon-delete.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("actor", deleting_user.ap_id)
       |> put_in(["object", "id"], activity.data["object"])
 
@@ -57,7 +57,7 @@ test "it works for incoming when the object has been pruned" do
 
     data =
       File.read!("test/fixtures/mastodon-delete.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("actor", deleting_user.ap_id)
       |> put_in(["object", "id"], activity.data["object"])
 
@@ -78,7 +78,7 @@ test "it fails for incoming deletes with spoofed origin" do
 
     data =
       File.read!("test/fixtures/mastodon-delete.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("actor", ap_id)
       |> put_in(["object", "id"], activity.data["object"])
 
@@ -91,7 +91,7 @@ test "it works for incoming user deletes" do
 
     data =
       File.read!("test/fixtures/mastodon-delete-user.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
 
     {:ok, _} = Transmogrifier.handle_incoming(data)
     ObanHelpers.perform_all()
@@ -104,7 +104,7 @@ test "it fails for incoming user deletes with spoofed origin" do
 
     data =
       File.read!("test/fixtures/mastodon-delete-user.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("actor", ap_id)
 
     assert match?({:error, _}, Transmogrifier.handle_incoming(data))
diff --git a/test/pleroma/web/activity_pub/transmogrifier/emoji_react_handling_test.exs b/test/pleroma/web/activity_pub/transmogrifier/emoji_react_handling_test.exs
index 0fb056b50..aea4ed6f8 100644
--- a/test/pleroma/web/activity_pub/transmogrifier/emoji_react_handling_test.exs
+++ b/test/pleroma/web/activity_pub/transmogrifier/emoji_react_handling_test.exs
@@ -19,7 +19,7 @@ test "it works for incoming emoji reactions" do
 
     data =
       File.read!("test/fixtures/emoji-reaction.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("object", activity.data["object"])
       |> Map.put("actor", other_user.ap_id)
 
@@ -44,7 +44,7 @@ test "it reject invalid emoji reactions" do
 
     data =
       File.read!("test/fixtures/emoji-reaction-too-long.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("object", activity.data["object"])
       |> Map.put("actor", other_user.ap_id)
 
@@ -52,7 +52,7 @@ test "it reject invalid emoji reactions" do
 
     data =
       File.read!("test/fixtures/emoji-reaction-no-emoji.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("object", activity.data["object"])
       |> Map.put("actor", other_user.ap_id)
 
diff --git a/test/pleroma/web/activity_pub/transmogrifier/follow_handling_test.exs b/test/pleroma/web/activity_pub/transmogrifier/follow_handling_test.exs
index 4ef8210ad..985c26def 100644
--- a/test/pleroma/web/activity_pub/transmogrifier/follow_handling_test.exs
+++ b/test/pleroma/web/activity_pub/transmogrifier/follow_handling_test.exs
@@ -28,7 +28,7 @@ test "it works for osada follow request" do
 
       data =
         File.read!("test/fixtures/osada-follow-activity.json")
-        |> Poison.decode!()
+        |> Jason.decode!()
         |> Map.put("object", user.ap_id)
 
       {:ok, %Activity{data: data, local: false} = activity} = Transmogrifier.handle_incoming(data)
@@ -47,7 +47,7 @@ test "it works for incoming follow requests" do
 
       data =
         File.read!("test/fixtures/mastodon-follow-activity.json")
-        |> Poison.decode!()
+        |> Jason.decode!()
         |> Map.put("object", user.ap_id)
 
       {:ok, %Activity{data: data, local: false} = activity} = Transmogrifier.handle_incoming(data)
@@ -69,7 +69,7 @@ test "with locked accounts, it does create a Follow, but not an Accept" do
 
       data =
         File.read!("test/fixtures/mastodon-follow-activity.json")
-        |> Poison.decode!()
+        |> Jason.decode!()
         |> Map.put("object", user.ap_id)
 
       {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
@@ -100,7 +100,7 @@ test "it works for follow requests when you are already followed, creating a new
 
       data =
         File.read!("test/fixtures/mastodon-follow-activity.json")
-        |> Poison.decode!()
+        |> Jason.decode!()
         |> Map.put("object", user.ap_id)
 
       {:ok, %Activity{local: false}} = Transmogrifier.handle_incoming(data)
@@ -116,7 +116,7 @@ test "it works for follow requests when you are already followed, creating a new
 
       data =
         File.read!("test/fixtures/mastodon-follow-activity.json")
-        |> Poison.decode!()
+        |> Jason.decode!()
         |> Map.put("id", String.replace(data["id"], "2", "3"))
         |> Map.put("object", user.ap_id)
 
@@ -142,7 +142,7 @@ test "it rejects incoming follow requests from blocked users when deny_follow_bl
 
       data =
         File.read!("test/fixtures/mastodon-follow-activity.json")
-        |> Poison.decode!()
+        |> Jason.decode!()
         |> Map.put("object", user.ap_id)
 
       {:ok, %Activity{data: %{"id" => id}}} = Transmogrifier.handle_incoming(data)
@@ -157,7 +157,7 @@ test "it rejects incoming follow requests if the following errors for some reaso
 
       data =
         File.read!("test/fixtures/mastodon-follow-activity.json")
-        |> Poison.decode!()
+        |> Jason.decode!()
         |> Map.put("object", user.ap_id)
 
       with_mock Pleroma.User, [:passthrough], follow: fn _, _, _ -> {:error, :testing} end do
@@ -174,7 +174,7 @@ test "it works for incoming follow requests from hubzilla" do
 
       data =
         File.read!("test/fixtures/hubzilla-follow-activity.json")
-        |> Poison.decode!()
+        |> Jason.decode!()
         |> Map.put("object", user.ap_id)
         |> Utils.normalize_params()
 
@@ -192,7 +192,7 @@ test "it works for incoming follows to locked account" do
 
       data =
         File.read!("test/fixtures/mastodon-follow-activity.json")
-        |> Poison.decode!()
+        |> Jason.decode!()
         |> Map.put("object", user.ap_id)
 
       {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
diff --git a/test/pleroma/web/activity_pub/transmogrifier/like_handling_test.exs b/test/pleroma/web/activity_pub/transmogrifier/like_handling_test.exs
index 53fe1d550..967bad151 100644
--- a/test/pleroma/web/activity_pub/transmogrifier/like_handling_test.exs
+++ b/test/pleroma/web/activity_pub/transmogrifier/like_handling_test.exs
@@ -18,7 +18,7 @@ test "it works for incoming likes" do
 
     data =
       File.read!("test/fixtures/mastodon-like.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("object", activity.data["object"])
 
     _actor = insert(:user, ap_id: data["actor"], local: false)
@@ -40,7 +40,7 @@ test "it works for incoming misskey likes, turning them into EmojiReacts" do
 
     data =
       File.read!("test/fixtures/misskey-like.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("object", activity.data["object"])
 
     _actor = insert(:user, ap_id: data["actor"], local: false)
@@ -61,7 +61,7 @@ test "it works for incoming misskey likes that contain unicode emojis, turning t
 
     data =
       File.read!("test/fixtures/misskey-like.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("object", activity.data["object"])
       |> Map.put("_misskey_reaction", "⭐")
 
diff --git a/test/pleroma/web/activity_pub/transmogrifier/question_handling_test.exs b/test/pleroma/web/activity_pub/transmogrifier/question_handling_test.exs
index d2822ce75..47f92cf4d 100644
--- a/test/pleroma/web/activity_pub/transmogrifier/question_handling_test.exs
+++ b/test/pleroma/web/activity_pub/transmogrifier/question_handling_test.exs
@@ -18,7 +18,7 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier.QuestionHandlingTest do
   end
 
   test "Mastodon Question activity" do
-    data = File.read!("test/fixtures/mastodon-question-activity.json") |> Poison.decode!()
+    data = File.read!("test/fixtures/mastodon-question-activity.json") |> Jason.decode!()
 
     {:ok, %Activity{local: false} = activity} = Transmogrifier.handle_incoming(data)
 
@@ -97,7 +97,7 @@ test "Mastodon Question activity with HTML tags in plaintext" do
 
     data =
       File.read!("test/fixtures/mastodon-question-activity.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Kernel.put_in(["object", "oneOf"], options)
 
     {:ok, %Activity{local: false} = activity} = Transmogrifier.handle_incoming(data)
@@ -142,7 +142,7 @@ test "Mastodon Question activity with custom emojis" do
 
     data =
       File.read!("test/fixtures/mastodon-question-activity.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Kernel.put_in(["object", "oneOf"], options)
       |> Kernel.put_in(["object", "tag"], tag)
 
@@ -158,7 +158,7 @@ test "Mastodon Question activity with custom emojis" do
   end
 
   test "returns same activity if received a second time" do
-    data = File.read!("test/fixtures/mastodon-question-activity.json") |> Poison.decode!()
+    data = File.read!("test/fixtures/mastodon-question-activity.json") |> Jason.decode!()
 
     assert {:ok, %Activity{local: false} = activity} = Transmogrifier.handle_incoming(data)
 
@@ -168,7 +168,7 @@ test "returns same activity if received a second time" do
   test "accepts a Question with no content" do
     data =
       File.read!("test/fixtures/mastodon-question-activity.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Kernel.put_in(["object", "content"], "")
 
     assert {:ok, %Activity{local: false}} = Transmogrifier.handle_incoming(data)
diff --git a/test/pleroma/web/activity_pub/transmogrifier/reject_handling_test.exs b/test/pleroma/web/activity_pub/transmogrifier/reject_handling_test.exs
index 5c1451def..cc28eb7ef 100644
--- a/test/pleroma/web/activity_pub/transmogrifier/reject_handling_test.exs
+++ b/test/pleroma/web/activity_pub/transmogrifier/reject_handling_test.exs
@@ -18,7 +18,7 @@ test "it fails for incoming rejects which cannot be correlated" do
 
     accept_data =
       File.read!("test/fixtures/mastodon-reject-activity.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("actor", followed.ap_id)
 
     accept_data =
@@ -42,7 +42,7 @@ test "it works for incoming rejects which are referenced by IRI only" do
 
     reject_data =
       File.read!("test/fixtures/mastodon-reject-activity.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("actor", followed.ap_id)
       |> Map.put("object", follow_activity.data["id"])
 
@@ -58,7 +58,7 @@ test "it rejects activities without a valid ID" do
 
     data =
       File.read!("test/fixtures/mastodon-follow-activity.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("object", user.ap_id)
       |> Map.put("id", "")
 
diff --git a/test/pleroma/web/activity_pub/transmogrifier/undo_handling_test.exs b/test/pleroma/web/activity_pub/transmogrifier/undo_handling_test.exs
index 8683f7135..fcfc7b4b6 100644
--- a/test/pleroma/web/activity_pub/transmogrifier/undo_handling_test.exs
+++ b/test/pleroma/web/activity_pub/transmogrifier/undo_handling_test.exs
@@ -21,7 +21,7 @@ test "it works for incoming emoji reaction undos" do
 
     data =
       File.read!("test/fixtures/mastodon-undo-like.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("object", reaction_activity.data["id"])
       |> Map.put("actor", user.ap_id)
 
@@ -38,7 +38,7 @@ test "it returns an error for incoming unlikes wihout a like activity" do
 
     data =
       File.read!("test/fixtures/mastodon-undo-like.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("object", activity.data["object"])
 
     assert Transmogrifier.handle_incoming(data) == :error
@@ -50,7 +50,7 @@ test "it works for incoming unlikes with an existing like activity" do
 
     like_data =
       File.read!("test/fixtures/mastodon-like.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("object", activity.data["object"])
 
     _liker = insert(:user, ap_id: like_data["actor"], local: false)
@@ -59,7 +59,7 @@ test "it works for incoming unlikes with an existing like activity" do
 
     data =
       File.read!("test/fixtures/mastodon-undo-like.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("object", like_data)
       |> Map.put("actor", like_data["actor"])
 
@@ -81,7 +81,7 @@ test "it works for incoming unlikes with an existing like activity and a compact
 
     like_data =
       File.read!("test/fixtures/mastodon-like.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("object", activity.data["object"])
 
     _liker = insert(:user, ap_id: like_data["actor"], local: false)
@@ -90,7 +90,7 @@ test "it works for incoming unlikes with an existing like activity and a compact
 
     data =
       File.read!("test/fixtures/mastodon-undo-like.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("object", like_data["id"])
       |> Map.put("actor", like_data["actor"])
 
@@ -108,7 +108,7 @@ test "it works for incoming unannounces with an existing notice" do
 
     announce_data =
       File.read!("test/fixtures/mastodon-announce.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("object", activity.data["object"])
 
     _announcer = insert(:user, ap_id: announce_data["actor"], local: false)
@@ -118,7 +118,7 @@ test "it works for incoming unannounces with an existing notice" do
 
     data =
       File.read!("test/fixtures/mastodon-undo-announce.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("object", announce_data)
       |> Map.put("actor", announce_data["actor"])
 
@@ -135,7 +135,7 @@ test "it works for incoming unfollows with an existing follow" do
 
     follow_data =
       File.read!("test/fixtures/mastodon-follow-activity.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("object", user.ap_id)
 
     _follower = insert(:user, ap_id: follow_data["actor"], local: false)
@@ -144,7 +144,7 @@ test "it works for incoming unfollows with an existing follow" do
 
     data =
       File.read!("test/fixtures/mastodon-unfollow-activity.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("object", follow_data)
 
     {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
@@ -162,7 +162,7 @@ test "it works for incoming unblocks with an existing block" do
 
     block_data =
       File.read!("test/fixtures/mastodon-block-activity.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("object", user.ap_id)
 
     _blocker = insert(:user, ap_id: block_data["actor"], local: false)
@@ -171,7 +171,7 @@ test "it works for incoming unblocks with an existing block" do
 
     data =
       File.read!("test/fixtures/mastodon-unblock-activity.json")
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("object", block_data)
 
     {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
diff --git a/test/pleroma/web/activity_pub/transmogrifier/user_update_handling_test.exs b/test/pleroma/web/activity_pub/transmogrifier/user_update_handling_test.exs
index 7c4d16db7..c62d5e139 100644
--- a/test/pleroma/web/activity_pub/transmogrifier/user_update_handling_test.exs
+++ b/test/pleroma/web/activity_pub/transmogrifier/user_update_handling_test.exs
@@ -14,7 +14,7 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier.UserUpdateHandlingTest do
   test "it works for incoming update activities" do
     user = insert(:user, local: false)
 
-    update_data = File.read!("test/fixtures/mastodon-update.json") |> Poison.decode!()
+    update_data = File.read!("test/fixtures/mastodon-update.json") |> Jason.decode!()
 
     object =
       update_data["object"]
@@ -58,7 +58,7 @@ test "it works with alsoKnownAs" do
     {:ok, _activity} =
       "test/fixtures/mastodon-update.json"
       |> File.read!()
-      |> Poison.decode!()
+      |> Jason.decode!()
       |> Map.put("actor", actor)
       |> Map.update!("object", fn object ->
         object
@@ -82,7 +82,7 @@ test "it works with custom profile fields" do
 
     assert user.fields == []
 
-    update_data = File.read!("test/fixtures/mastodon-update.json") |> Poison.decode!()
+    update_data = File.read!("test/fixtures/mastodon-update.json") |> Jason.decode!()
 
     object =
       update_data["object"]
@@ -138,7 +138,7 @@ test "it works with custom profile fields" do
   test "it works for incoming update activities which lock the account" do
     user = insert(:user, local: false)
 
-    update_data = File.read!("test/fixtures/mastodon-update.json") |> Poison.decode!()
+    update_data = File.read!("test/fixtures/mastodon-update.json") |> Jason.decode!()
 
     object =
       update_data["object"]
diff --git a/test/pleroma/web/activity_pub/transmogrifier_test.exs b/test/pleroma/web/activity_pub/transmogrifier_test.exs
index 333bb4f9b..66ea7664a 100644
--- a/test/pleroma/web/activity_pub/transmogrifier_test.exs
+++ b/test/pleroma/web/activity_pub/transmogrifier_test.exs
@@ -31,14 +31,14 @@ test "it works for incoming unfollows with an existing follow" do
 
       follow_data =
         File.read!("test/fixtures/mastodon-follow-activity.json")
-        |> Poison.decode!()
+        |> Jason.decode!()
         |> Map.put("object", user.ap_id)
 
       {:ok, %Activity{data: _, local: false}} = Transmogrifier.handle_incoming(follow_data)
 
       data =
         File.read!("test/fixtures/mastodon-unfollow-activity.json")
-        |> Poison.decode!()
+        |> Jason.decode!()
         |> Map.put("object", follow_data)
 
       {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
diff --git a/test/pleroma/web/federator_test.exs b/test/pleroma/web/federator_test.exs
index 592fdccd1..67001add7 100644
--- a/test/pleroma/web/federator_test.exs
+++ b/test/pleroma/web/federator_test.exs
@@ -164,7 +164,7 @@ test "it does not crash if MRF rejects the post" do
 
       params =
         File.read!("test/fixtures/mastodon-post-activity.json")
-        |> Poison.decode!()
+        |> Jason.decode!()
 
       assert {:ok, job} = Federator.incoming_ap_doc(params)
       assert {:error, _} = ObanHelpers.perform(job)
diff --git a/test/pleroma/web/o_auth/o_auth_controller_test.exs b/test/pleroma/web/o_auth/o_auth_controller_test.exs
index a00df8cc7..c6526d8c9 100644
--- a/test/pleroma/web/o_auth/o_auth_controller_test.exs
+++ b/test/pleroma/web/o_auth/o_auth_controller_test.exs
@@ -81,7 +81,7 @@ test "GET /oauth/prepare_request encodes parameters as `state` and redirects", %
 
       redirect_query = URI.parse(redirected_to(conn)).query
       assert %{"state" => state_param} = URI.decode_query(redirect_query)
-      assert {:ok, state_components} = Poison.decode(state_param)
+      assert {:ok, state_components} = Jason.decode(state_param)
 
       expected_client_id = app.client_id
       expected_redirect_uri = app.redirect_uris
@@ -115,7 +115,7 @@ test "with user-bound registration, GET /oauth/<provider>/callback redirects to
             "oauth_token" => "G-5a3AAAAAAAwMH9AAABaektfSM",
             "oauth_verifier" => "QZl8vUqNvXMTKpdmUnGejJxuHG75WWWs",
             "provider" => "twitter",
-            "state" => Poison.encode!(state_params)
+            "state" => Jason.encode!(state_params)
           }
         )
 
@@ -147,7 +147,7 @@ test "with user-unbound registration, GET /oauth/<provider>/callback renders reg
             "oauth_token" => "G-5a3AAAAAAAwMH9AAABaektfSM",
             "oauth_verifier" => "QZl8vUqNvXMTKpdmUnGejJxuHG75WWWs",
             "provider" => "twitter",
-            "state" => Poison.encode!(state_params)
+            "state" => Jason.encode!(state_params)
           }
         )
 
@@ -178,7 +178,7 @@ test "on authentication error, GET /oauth/<provider>/callback redirects to `redi
             "oauth_token" => "G-5a3AAAAAAAwMH9AAABaektfSM",
             "oauth_verifier" => "QZl8vUqNvXMTKpdmUnGejJxuHG75WWWs",
             "provider" => "twitter",
-            "state" => Poison.encode!(state_params)
+            "state" => Jason.encode!(state_params)
           }
         )
 
diff --git a/test/pleroma/web/streamer_test.exs b/test/pleroma/web/streamer_test.exs
index 0d89e01d0..dd210c3b5 100644
--- a/test/pleroma/web/streamer_test.exs
+++ b/test/pleroma/web/streamer_test.exs
@@ -222,7 +222,7 @@ test "it streams boosts of mastodon user in the 'user' stream", %{
 
       data =
         File.read!("test/fixtures/mastodon-announce.json")
-        |> Poison.decode!()
+        |> Jason.decode!()
         |> Map.put("object", activity.data["object"])
         |> Map.put("actor", user.ap_id)
 
diff --git a/test/support/helpers.ex b/test/support/helpers.ex
index ecd4b1e18..224034521 100644
--- a/test/support/helpers.ex
+++ b/test/support/helpers.ex
@@ -85,8 +85,8 @@ def render_json(view, template, assigns) do
         assigns = Map.new(assigns)
 
         view.render(template, assigns)
-        |> Poison.encode!()
-        |> Poison.decode!()
+        |> Jason.encode!()
+        |> Jason.decode!()
       end
 
       def stringify_keys(nil), do: nil