diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,10 @@
 # Changelog
 
-#### 0.2.2.0
+#### 0.2.2.1
+
+* Allow `attoparsec 0.12.*`
+
+### 0.2.2.0
 
 * Deprecate `parseNumber` in favor of `Data.Scientific.floatingOrInteger`
 * Re-export `Data.Scientific.floatingOrInteger`
diff --git a/aeson-utils.cabal b/aeson-utils.cabal
--- a/aeson-utils.cabal
+++ b/aeson-utils.cabal
@@ -1,5 +1,5 @@
 name:                aeson-utils
-version:             0.2.2.0
+version:             0.2.2.1
 synopsis:            Utilities for working with Aeson.
 description:         Utilities for working with Aeson.
 license:             BSD3
@@ -28,7 +28,7 @@
   build-depends:
       base == 4.*
     , aeson >= 0.6 && < 0.8
-    , attoparsec >= 0.10 && < 0.12
+    , attoparsec >= 0.10 && < 0.13
     , bytestring >= 0.9 && < 0.11
     , scientific >= 0.3.2 && < 0.4
     , text >= 0.11 && < 1.2