diff --git a/language-python/language-python.cabal b/language-python/language-python.cabal
index 1ecde97..54ce724 100644
--- a/language-python/language-python.cabal
+++ b/language-python/language-python.cabal
@@ -41,7 +41,7 @@ Library
       pretty == 1.1.*,
       array >= 0.4 && < 0.6,
       transformers >= 0.3 && < 0.7,
-      monads-tf == 0.1.*,
+      monads-tf == 0.3.*,
       utf8-string >= 1 && < 2
    build-tools: happy, alex
    exposed-modules: