diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index c1ea5f5..1117fc2 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -10,6 +10,15 @@ jobs:
   ci-ubuntu:
     runs-on: ubuntu-22.04
     steps:
+    - name: install clang
+      shell: bash
+      run: |
+        wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
+        sudo echo "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy main" >> /etc/apt/sources.list.d/llvm.list
+        sudo echo "deb-src http://apt.llvm.org/jammy/ llvm-toolchain-jammy main" >> /etc/apt/sources.list.d/llvm.list
+        sudo apt update -y
+        sudo apt upgrade -y
+        sudo apt install clang-17 -y
     - uses: actions/checkout@v4
       with:
         submodules: recursive
@@ -27,7 +36,7 @@ jobs:
       run: curl https://qoiformat.org/benchmark/qoi_benchmark_suite.tar | tar x
     - name: build
       shell: bash
-      run: make -j
+      run: CXX=clang++-17 make -j
     - name: run
       shell: bash
       run: bin/qoibench 1 images --noreference --nowarmup
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index dd63dab..2399cad 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -18,7 +18,7 @@ jobs:
           git
           curl
           mingw-w64-ucrt-x86_64-make
-          mingw-w64-ucrt-x86_64-gcc
+          mingw-w64-ucrt-x86_64-clang
     - uses: actions/checkout@v4
       with:
         submodules: recursive
@@ -36,7 +36,7 @@ jobs:
       run: curl https://qoiformat.org/benchmark/qoi_benchmark_suite.tar | tar x
     - name: build
       shell: msys2 {0}
-      run: mingw32-make -j
+      run: CXX=clang++ mingw32-make -j
     - name: run
       shell: msys2 {0}
       run: bin/qoibench 1 images --noreference --nowarmup