diff --git a/package.json b/package.json
index ebf064f..c1a92ca 100644
--- a/package.json
+++ b/package.json
@@ -48,6 +48,6 @@
     "proc-that": "^1.0.2",
     "@types/node": "^9.3.0",
     "rxjs": "^5.5.6",
-    "tslib": "^1.8.1"
+    "tslib": "^1.9.3"
   }
 }