diff --git a/pkgs/development/libraries/haskell/socket-io/default.nix b/pkgs/development/libraries/haskell/socket-io/default.nix
index c64c7c48edc..57827d495f3 100644
--- a/pkgs/development/libraries/haskell/socket-io/default.nix
+++ b/pkgs/development/libraries/haskell/socket-io/default.nix
@@ -6,8 +6,8 @@
 
 cabal.mkDerivation (self: {
   pname = "socket-io";
-  version = "1.1.1";
-  sha256 = "0zr5kj519hw90rlicang5f573dd325rxv24psf12fxl6vmyxx1zc";
+  version = "1.2.0";
+  sha256 = "1271qmd83q669dcs6ni0f84i5kgvh8vgr4xgx2lcprirbzkx0gdl";
   buildDepends = [
     aeson attoparsec engineIo mtl stm text transformers
     unorderedContainers vector