diff --git a/package.json b/package.json
index 2571995..b8bbb32 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
   "bugs": "http://github.com/devongovett/pdfkit/issues",
   "devDependencies": {
     "coffee-script": ">=1.0.1",
-    "codemirror": "~3.21.0",
+    "codemirror": "~3.20.0",
     "markdown": "~0.5.0"
   },
   "dependencies": {