diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index af7aba9..317bfdb 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -16,7 +16,7 @@ jobs:
         sudo apt-get update -qq
         sudo apt-get install cmake gcc g++ ninja-build -qq
     - name: Configure CMake
-      run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -GNinja
+      run: cmake -B ${{github.workspace}}/build -DCMAKE_CXX_STANDARD=17 -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -GNinja
     - name: Build
       run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}}
     - name: Install
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 3d61e2e..0f4394c 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -21,7 +21,7 @@ jobs:
       with:
         arch: ${{matrix.arch}}
     - name: Configure CMake
-      run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -DRAGEPHOTO_UNICODE=wincvt -GNinja
+      run: cmake -B ${{github.workspace}}/build -DCMAKE_CXX_STANDARD=17 -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -DRAGEPHOTO_UNICODE=wincvt -GNinja
     - name: Build
       run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}}
     - name: Install