diff --git a/bigint/src/lib.rs b/bigint/src/lib.rs
index 5d261da..586eeec 100644
--- a/bigint/src/lib.rs
+++ b/bigint/src/lib.rs
@@ -120,8 +120,9 @@ use std::hash;
 
 #[cfg(test)]
 fn hash<T: hash::Hash>(x: &T) -> u64 {
-    use std::hash::Hasher;
-    let mut hasher = hash::SipHasher::new();
+    use std::hash::{BuildHasher, Hasher};
+    use std::collections::hash_map::RandomState;
+    let mut hasher = <RandomState as BuildHasher>::Hasher::new();
     x.hash(&mut hasher);
     hasher.finish()
 }
diff --git a/complex/src/lib.rs b/complex/src/lib.rs
index c73cb42..cb605a2 100644
--- a/complex/src/lib.rs
+++ b/complex/src/lib.rs
@@ -765,8 +765,9 @@ impl<T> serde::Deserialize for Complex<T> where
 
 #[cfg(test)]
 fn hash<T: hash::Hash>(x: &T) -> u64 {
-    use std::hash::Hasher;
-    let mut hasher = hash::SipHasher::new();
+    use std::hash::{BuildHasher, Hasher};
+    use std::collections::hash_map::RandomState;
+    let mut hasher = <RandomState as BuildHasher>::Hasher::new();
     x.hash(&mut hasher);
     hasher.finish()
 }
diff --git a/rational/src/lib.rs b/rational/src/lib.rs
index 7162202..e12b987 100644
--- a/rational/src/lib.rs
+++ b/rational/src/lib.rs
@@ -843,8 +843,9 @@ fn approximate_float_unsigned<T, F>(val: F, max_error: F, max_iterations: usize)
 
 #[cfg(test)]
 fn hash<T: hash::Hash>(x: &T) -> u64 {
-    use std::hash::Hasher;
-    let mut hasher = hash::SipHasher::new();
+    use std::hash::{BuildHasher, Hasher};
+    use std::collections::hash_map::RandomState;
+    let mut hasher = <RandomState as BuildHasher>::Hasher::new();
     x.hash(&mut hasher);
     hasher.finish()
 }