diff --git a/package-lock.json b/package-lock.json
index d2371ff..cbd3bac 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2669,9 +2669,9 @@
       }
     },
     "google-closure-library": {
-      "version": "20160315.0.0",
-      "resolved": "https://registry.npmjs.org/google-closure-library/-/google-closure-library-20160315.0.0.tgz",
-      "integrity": "sha1-wTG3DatB/tu784It+OTD50Ta1cE=",
+      "version": "20200315.0.0",
+      "resolved": "https://registry.npmjs.org/google-closure-library/-/google-closure-library-20200315.0.0.tgz",
+      "integrity": "sha512-LdCecdztxDvA9K+8b6E9aE4Hw7ABdYokfA7d5qW1sd/iy8O1l0+eXLlddE2JtW62gf8UjcPskBua4fU4J5lmHA==",
       "dev": true
     },
     "graceful-fs": {
diff --git a/package.json b/package.json
index 7409d23..50986ea 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,7 @@
   "devDependencies": {
     "chai": "4.3.4",
     "google-closure-compiler": "20160315.2.0",
-    "google-closure-library": "20160315.0.0",
+    "google-closure-library": "20200315.0.0",
     "gulp": "4.0.2",
     "gulp-clean-css": "4.3.0",
     "gulp-closure-compiler": "0.4.0",