diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 6df7fdf..1604dcd 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -33,7 +33,9 @@ jobs:
           python-version: 3.x
 
       - name: Install llvm
-        run: sudo apt install -y llvm
+        run: |
+          sudo apt update
+          sudo apt install -y llvm
 
       - name: Cache Rust and sccache
         uses: actions/cache@v4