diff --git a/dot.cabal b/dot.cabal
--- a/dot.cabal
+++ b/dot.cabal
@@ -1,5 +1,5 @@
 name:                dot
-version:             0.2.1
+version:             0.2.2
 synopsis:            Data types and encoding for graphviz dot files
 description:         Please see README.md
 homepage:            https://github.com/andrewthad/dot#readme
@@ -21,7 +21,7 @@
   build-depends:
       base >= 4.7 && < 5
     , text
-    , impure-containers >= 0.3 && < 0.4
+    , impure-containers >= 0.3 && < 0.5
   default-language:    Haskell2010
 
 source-repository head