diff --git a/Changelog.md b/Changelog.md
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,3 +1,7 @@
+## 1.3.9
+
+* Increased the bound of `aeson`.
+
 ## 1.3.8
 
 * Increased the bound of `aeson` and `base`.
diff --git a/socket-io.cabal b/socket-io.cabal
--- a/socket-io.cabal
+++ b/socket-io.cabal
@@ -1,5 +1,5 @@
 name: socket-io
-version: 1.3.8
+version: 1.3.9
 homepage: http://github.com/ocharles/engine.io
 license: BSD3
 license-file: LICENSE
@@ -22,7 +22,7 @@
     FlexibleContexts, OverloadedStrings, RankNTypes
 
   build-depends:
-    aeson >=0.7 && <1.3,
+    aeson >=0.7 && <1.4,
     attoparsec >=0.10 && <0.14,
     base >=4.6 && <4.11,
     bytestring >=0.10 && <0.11,