diff --git a/language-python.cabal b/language-python.cabal
--- a/language-python.cabal
+++ b/language-python.cabal
@@ -1,5 +1,5 @@
 name:                language-python
-version:             0.3.0
+version:             0.3.1
 cabal-version:       >= 1.6
 synopsis:            Parsing and pretty printing of Python code. 
 description:         language-python is a Haskell library for lexical analysis, parsing 
@@ -19,7 +19,7 @@
 
 Library
    hs-source-dirs:   src
-   build-depends:    base == 4.*, containers == 0.2.*, pretty == 1.0.*, array == 0.2.*, transformers == 0.2.*, 
+   build-depends:    base == 4.*, containers < 0.4, pretty == 1.0.*, array < 0.4, transformers == 0.2.*, 
                      monads-tf == 0.1.*
    build-tools:      happy, alex
    exposed-modules: