diff --git a/scripts/src/lib/Api.ts b/scripts/src/lib/Api.ts
index f5d856a5..2ff26d54 100644
--- a/scripts/src/lib/Api.ts
+++ b/scripts/src/lib/Api.ts
@@ -128,6 +128,8 @@ export function isApiVersionvalidForMcVersion(apiVersion: string, mcVersion: str
         branch = "1.20.5"
     } else if (mcVersion.startsWith("1.20.6")) {
         branch = "1.20.6"
+    } else if (mcVersion.startsWith("1.21.1")) {
+        branch = "1.21.1"
     } else if (mcVersion.startsWith("1.21")) {
         branch = "1.21"
     } else if (mcVersion.startsWith("21w")) {