diff --git a/heist.cabal b/heist.cabal
--- a/heist.cabal
+++ b/heist.cabal
@@ -1,5 +1,5 @@
 name:           heist
-version:        0.5.2
+version:        0.5.2.1
 synopsis:       An xhtml templating system
 description:    An xhtml templating system
 license:        BSD3
@@ -80,7 +80,7 @@
     Text.Templating.Heist.Types
 
   build-depends:
-    attoparsec >= 0.8.1 && < 0.9,
+    attoparsec >= 0.8.1 && < 0.10,
     attoparsec-text >= 0.8 && < 0.9,
     base >= 4 && < 5,
     blaze-builder >= 0.2 && <0.4,