diff --git a/.github/workflows/run-tck.yml b/.github/workflows/run-tck.yml
index 744ff8082..a4ef8a8b7 100644
--- a/.github/workflows/run-tck.yml
+++ b/.github/workflows/run-tck.yml
@@ -11,7 +11,7 @@ on:
 
 env:
   # Tag/branch of the TCK
-  TCK_VERSION: main
+  TCK_VERSION: 1.0.0.alpha2
   TCK_VERSION_0_3: 0.3.0.beta5
   # Tells uv to not need a venv, and instead use system
   UV_SYSTEM_PYTHON: 1