diff --git a/History.md b/History.md
index 3c9eb7b..07fa20a 100644
--- a/History.md
+++ b/History.md
@@ -1,4 +1,9 @@
 
+3.1.1 / 2017-04-25
+==================
+
+  * [fix] Ensure globals are functions before running `instanceof` (#68)
+
 3.1.0 / 2017-04-24
 ==================
 
diff --git a/package.json b/package.json
index c658a90..e6f07f6 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "socket.io-parser",
-  "version": "3.1.0",
+  "version": "3.1.1",
   "description": "socket.io protocol parser",
   "repository": {
     "type": "git",