diff --git a/web/time-wasting-thread-memorial.cabal b/web/time-wasting-thread-memorial.cabal
index de3a315..eff264b 100644
--- a/web/time-wasting-thread-memorial.cabal
+++ b/web/time-wasting-thread-memorial.cabal
@@ -68,6 +68,7 @@ executable time-wasting-thread-memorial
                      , pandoc >=1.15.0.6
                      , mtl >=2.2.1
                      , containers >=0.5.0.0
+                     , transformers >=0.4.3.0
 
   -- Directories containing source files.
   hs-source-dirs:      src