diff --git a/src/NSwag.Npm/bin/nswag.js b/src/NSwag.Npm/bin/nswag.js
index 4276f3973b..fdffc83535 100644
--- a/src/NSwag.Npm/bin/nswag.js
+++ b/src/NSwag.Npm/bin/nswag.js
@@ -1,7 +1,7 @@
 #!/usr/bin/env node
 "use strict";
 
-var defaultCoreVersion = "22";
+var defaultCoreVersion = "21";
 var supportedCoreVersions = ["10", "11", "20", "21", "22"];
 
 // Initialize