diff --git a/package-lock.json b/package-lock.json
index 64183373..881bdb7d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10950,9 +10950,9 @@
       }
     },
     "tslib": {
-      "version": "1.9.0",
-      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.9.0.tgz",
-      "integrity": "sha512-f/qGG2tUkrISBlQZEjEqoZ3B2+npJjIf04H1wuAv9iA8i04Icp+61KRXxFdha22670NJopsZCIjhC3SnjPRKrQ=="
+      "version": "1.9.1",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.9.1.tgz",
+      "integrity": "sha512-avfPS28HmGLLc2o4elcc2EIq2FcH++Yo5YxpBZi9Yw93BCTGFthI4HPE4Rpep6vSYQaK8e69PelM44tPj+RaQg=="
     },
     "tslint": {
       "version": "5.10.0",
diff --git a/package.json b/package.json
index 91da8940..61dc33f4 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
   },
   "dependencies": {
     "babel-runtime": "^6.26.0",
-    "tslib": "^1.9.0",
+    "tslib": "^1.9.1",
     "worker-factory": "^2.4.2"
   },
   "description": "The worker which is used by the async-array-buffer package.",