diff --git a/gi-webkit2webextension.cabal b/gi-webkit2webextension.cabal
--- a/gi-webkit2webextension.cabal
+++ b/gi-webkit2webextension.cabal
@@ -1,5 +1,5 @@
 name:               gi-webkit2webextension
-version:            4.0.1
+version:            4.0.2
 synopsis:           WebKit2-WebExtension bindings
 description:        Bindings for WebKit2-WebExtension, autogenerated by haskell-gi.
 homepage:           https://github.com/haskell-gi/haskell-gi
@@ -32,4 +32,4 @@
         bytestring >= 0.10,
         containers >= 0.5,
         text >= 1.0,
-        transformers >= 0.5
+        transformers >= 0.4