diff --git a/package.json b/package.json
index 6560dec..715ff47 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
     "define-property": "2.0.2"
   },
   "devDependencies": {
-    "acorn": "5.5.1",
+    "acorn": "5.5.3",
     "clone-deep": "2.0.2",
     "eslint-config-standard-tunnckocore": "1.0.10",
     "espree": "3.5.4",
diff --git a/yarn.lock b/yarn.lock
index 5637259..a93d33c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -8,9 +8,9 @@ acorn-jsx@^3.0.0:
   dependencies:
     acorn "^3.0.4"
 
-acorn@5.5.1:
-  version "5.5.1"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.5.1.tgz#84e05a9ea0acbe131227da50301e62464dc9c1d8"
+acorn@5.5.3:
+  version "5.5.3"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.5.3.tgz#f473dd47e0277a08e28e9bec5aeeb04751f0b8c9"
 
 acorn@^3.0.4:
   version "3.3.0"