diff --git a/package-lock.json b/package-lock.json
index 54273a3..91c4715 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -210,9 +210,9 @@
       "dev": true
     },
     "acorn": {
-      "version": "2.7.0",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-2.7.0.tgz",
-      "integrity": "sha1-q259nYhqrKiwhbwzEreaGYQz8Oc="
+      "version": "5.7.4",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.4.tgz",
+      "integrity": "sha512-1D++VG7BhrtvQpNbBzovKNc1FLGGEE/oGe7b9xJm/RFHMBeUaUGpluV9RLjZa47YFdPcDAenEYuq9pQPcMdLJg=="
     },
     "acorn-jsx": {
       "version": "3.0.1",
diff --git a/package.json b/package.json
index bd2169d..939d9cc 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
   },
   "dependencies": {
     "@helpdotcom/build-ast": "^2.3.1",
-    "acorn": "~2.7.0",
+    "acorn": "~5.7.4",
     "escodegen": "~1.8.0",
     "github-slugger": "~1.0.1",
     "help": "~2.1.3",