diff --git a/Changelog.md b/Changelog.md
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,3 +1,7 @@
+## 1.3.3
+
+* Increase upper-bound of `vector` to < 0.12.
+
 ## 1.3.2
 
 * Increased upper-bounds of aeson to < 0.10 and of attoparsec to < 0.14.
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: 1.3.2
+version: 1.3.3
 homepage: http://github.com/ocharles/engine.io
 license: BSD3
 license-file: LICENSE
@@ -32,7 +32,7 @@
     text >=0.11 && <1.3,
     transformers >=0.2 && <0.5,
     unordered-containers >=0.2 && <0.3,
-    vector >=0.10 && <0.11
+    vector >=0.10 && <0.12
 
   hs-source-dirs: src
   default-language: Haskell2010