diff --git a/npm/ng-packs/packages/core/package.json b/npm/ng-packs/packages/core/package.json
index 322b20e951..11433378e1 100644
--- a/npm/ng-packs/packages/core/package.json
+++ b/npm/ng-packs/packages/core/package.json
@@ -16,7 +16,7 @@
     "just-clone": "^3.1.0",
     "just-compare": "^1.3.0",
     "snq": "^1.0.3",
-    "ts-toolbelt": "^6.15.5",
+    "ts-toolbelt": "6.15.4",
     "tslib": "^2.0.0"
   },
   "publishConfig": {