diff --git a/CHANGELOG.md b/CHANGELOG.md
index ea9b4a0b3d..105d0e734b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 1.12.15
+
+ * Update `acorn-6to5`.
+
 # 1.12.14
 
  * Fix duplicate let scoping in functions.
diff --git a/package.json b/package.json
index b1a73c76bd..2778706cd2 100644
--- a/package.json
+++ b/package.json
@@ -48,7 +48,7 @@
     "chokidar": "0.10.5",
     "source-map-support": "0.2.8",
     "esutils": "1.1.4",
-    "acorn-6to5": "https://github.com/6to5/acorn-6to5/archive/a6c34ba73e215bd16ee585f6794f6a6587820c58.tar.gz",
+    "acorn-6to5": "https://github.com/6to5/acorn-6to5/archive/74d8e9bed20ba302d3504f53d0b1c649968959e1.tar.gz",
     "estraverse": "^1.7.0"
   },
   "devDependencies": {