diff --git a/ckeditor5/node_modules/readable-stream/package.json b/ckeditor5/node_modules/readable-stream/package.json
index 2afa6fb..2c88e90 100644
--- a/ckeditor5/node_modules/readable-stream/package.json
+++ b/ckeditor5/node_modules/readable-stream/package.json
@@ -8,8 +8,8 @@
     "inherits": "~2.0.3",
     "isarray": "~1.0.0",
     "process-nextick-args": "~2.0.0",
-    "safe-buffer": "~5.1.1",
-    "string_decoder": "~1.1.1",
+    "safe-buffer": "~5.2.1",
+    "string_decoder": "~1.3.0",
     "util-deprecate": "~1.0.1"
   },
   "devDependencies": {