diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+#### 0.13.1.1
+
+* Allow `attoparsec 0.12.*`
+
 ### 0.13.1
 
 * Derive `Eq, Show` for all types in `Rest.Gen.Types`
diff --git a/rest-gen.cabal b/rest-gen.cabal
--- a/rest-gen.cabal
+++ b/rest-gen.cabal
@@ -1,5 +1,5 @@
 name:                rest-gen
-version:             0.13.1
+version:             0.13.1.1
 description:         Documentation and client generation from rest definition.
 synopsis:            Documentation and client generation from rest definition.
 maintainer:          code@silk.co
@@ -52,7 +52,7 @@
     , Cabal >= 1.18 && < 1.22
     , HStringTemplate >= 0.6 && < 0.8
     , aeson >= 0.7 && < 0.8
-    , attoparsec >= 0.10 && < 0.12
+    , attoparsec >= 0.10 && < 0.13
     , blaze-html >= 0.5 && < 0.8
     , bytestring >= 0.9 && < 0.11
     , code-builder == 0.1.*