diff --git a/package.json b/package.json
index 2f06f23..8af0c97 100644
--- a/package.json
+++ b/package.json
@@ -43,7 +43,7 @@
     "@types/react-dom": "16.8.4",
     "@typescript-eslint/eslint-plugin": "1.9.0",
     "@typescript-eslint/parser": "1.9.0",
-    "acorn": "6.1.1",
+    "acorn": "6.4.1",
     "awesome-typescript-loader": "5.2.1",
     "eslint": "5.16.0",
     "eslint-config-standard": "12.0.0",
diff --git a/yarn.lock b/yarn.lock
index 578571c..5172aca 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -713,10 +713,10 @@ acorn-walk@^6.0.1:
   resolved "https://registry.yarnpkg.com/acorn-walk/-/acorn-walk-6.1.1.tgz#d363b66f5fac5f018ff9c3a1e7b6f8e310cc3913"
   integrity sha512-OtUw6JUTgxA2QoqqmrmQ7F2NYqiBPi/L2jqHyFtllhOUvXYQXf0Z1CYUinIfyT4bTCGmrA7gX9FvHA81uzCoVw==
 
-acorn@6.1.1, acorn@^6.0.1, acorn@^6.0.5, acorn@^6.0.7, acorn@^6.1.1:
-  version "6.1.1"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.1.1.tgz#7d25ae05bb8ad1f9b699108e1094ecd7884adc1f"
-  integrity sha512-jPTiwtOxaHNaAPg/dmrJ/beuzLRnXtB0kQPQ8JpotKJgTB6rX6c8mlf315941pyjBSaPg8NHXS9fhP4u17DpGA==
+acorn@6.4.1, acorn@^6.0.1, acorn@^6.0.5, acorn@^6.0.7, acorn@^6.1.1:
+  version "6.4.1"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.4.1.tgz#531e58ba3f51b9dacb9a6646ca4debf5b14ca474"
+  integrity sha512-ZVA9k326Nwrj3Cj9jlh3wGFutC2ZornPNARZwsNYqQYgN0EsV2d53w5RN/co65Ohn4sUAUtb1rSUAOD6XN9idA==
 
 acorn@^5.5.3:
   version "5.7.3"