diff --git a/.github/workflows/build-plugin.yml b/.github/workflows/build-plugin.yml
index 06b8081..1649e56 100644
--- a/.github/workflows/build-plugin.yml
+++ b/.github/workflows/build-plugin.yml
@@ -2,7 +2,7 @@ name: Build VCV Rack Plugin
 on: [push, pull_request]
 
 env:
-  rack-sdk-version: latest
+  rack-sdk-version: 2.5.1
   rack-plugin-toolchain-dir: /home/build/rack-plugin-toolchain
 
 defaults: