diff --git a/package-lock.json b/package-lock.json
index c8fd4d3e..f133cb67 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -784,9 +784,9 @@
       }
     },
     "acorn": {
-      "version": "6.2.1",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.2.1.tgz",
-      "integrity": "sha512-JD0xT5FCRDNyjDda3Lrg/IxFscp9q4tiYtxE1/nOzlKCk7hIRuYjhq1kCNkbPjMRMZuFq20HNQn1I9k8Oj0E+Q=="
+      "version": "6.4.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.4.1.tgz",
+      "integrity": "sha512-ZVA9k326Nwrj3Cj9jlh3wGFutC2ZornPNARZwsNYqQYgN0EsV2d53w5RN/co65Ohn4sUAUtb1rSUAOD6XN9idA=="
     },
     "acorn-globals": {
       "version": "4.3.3",
diff --git a/package.json b/package.json
old mode 100755
new mode 100644
index 1e9e4790..e26ff1f1
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
   },
   "dependencies": {
     "@ministryofjustice/frontend": "0.0.10-alpha",
-    "acorn": "^6.0.5",
+    "acorn": "^6.4.1",
     "ansi-colors": "^3.2.3",
     "basic-auth": "^2.0.0",
     "basic-auth-connect": "^1.0.0",