diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index 85438b1bd..b12f5cb25 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -99,6 +99,7 @@ jobs:
           wget https://apt.llvm.org/llvm.sh
           chmod +x llvm.sh
           sudo ./llvm.sh 11
+          sudo apt-get install clang-tools-11
         shell: bash
       - name: cmake
         run: cmake -S . -B build -DJSON_CI=On