diff --git a/rest-gen.cabal b/rest-gen.cabal
--- a/rest-gen.cabal
+++ b/rest-gen.cabal
@@ -1,5 +1,5 @@
 name:                rest-gen
-version:             0.20.0.2
+version:             0.20.0.3
 description:         Documentation and client generation from rest definition.
 synopsis:            Documentation and client generation from rest definition.
 maintainer:          code@silk.co
@@ -60,7 +60,7 @@
     , fclabels >= 1.0.4 && < 2.1
     , filepath >= 1.2 && < 1.5
     , hashable >= 1.1 && < 1.3
-    , haskell-src-exts >= 1.18.1 && < 1.21
+    , haskell-src-exts >= 1.20 && < 1.21
     , hxt >= 9.2 && < 9.4
     , json-schema >= 0.6 && < 0.8
     , pretty >= 1.0 && < 1.2