diff --git a/engine-io-wai.cabal b/engine-io-wai.cabal
--- a/engine-io-wai.cabal
+++ b/engine-io-wai.cabal
@@ -1,5 +1,5 @@
 name: engine-io-wai
-version: 1.0.2
+version: 1.0.3
 homepage: http://github.com/ocharles/engine.io
 license: BSD3
 license-file: LICENSE
@@ -31,7 +31,7 @@
         either >= 4,
         transformers >= 0.2 && < 0.5,
         transformers-compat >= 0.4,
-        attoparsec >= 0.13 && < 0.14
+        attoparsec >= 0.10 && < 0.14
 
     hs-source-dirs: src
     default-language: Haskell2010