diff --git a/CHANGELOG.md b/CHANGELOG.md
index bb7d9142cc..59804c3883 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,8 @@ See [CHANGELOG - 6to5](CHANGELOG-6to5.md) for the pre-4.0.0 version changelog.
   * Don't unpack array patterns that have more elements than their right hand array expression.
  * **Polish**
   * Improve syntax highlighting in the code frame. Thanks [@lydell](https://github.com/lydell)!
+ * **Internal**
+  * Upgrade `acorn-babel`.
 
 ## 4.4.3
 
diff --git a/package.json b/package.json
index 2482431c2a..ab01429156 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
     "test": "make test"
   },
   "dependencies": {
-    "acorn-babel": "0.11.1-33",
+    "acorn-babel": "0.11.1-34",
     "ast-types": "~0.6.1",
     "chalk": "^0.5.1",
     "chokidar": "^0.12.6",