diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 45004a91d..91e30d6c7 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -526,7 +526,7 @@ jobs:
       matrix:
         ubuntu_version: [20.04, 22.04]
         build_type: [Release, Debug]
-        llvm_version: [17, 18, 19, 20, 21]
+        llvm_version: [17, 18, 19]
 
     steps:
       - uses: actions/checkout@v4