diff --git a/.github/workflows/linux-other-builds.yml b/.github/workflows/linux-other-builds.yml
index 31dcb921..cf4e2c06 100644
--- a/.github/workflows/linux-other-builds.yml
+++ b/.github/workflows/linux-other-builds.yml
@@ -86,6 +86,7 @@ jobs:
         cmake -Bbuild -H$GITHUB_WORKSPACE \
               -DCMAKE_BUILD_TYPE=${{matrix.build_type}} \
               -DCMAKE_CXX_STANDARD=${{matrix.std}} \
+              -DCMAKE_CXX_STANDARD_REQUIRED=ON \
               -DCMAKE_CXX_EXTENSIONS=OFF \
               -DCATCH_DEVELOPMENT_BUILD=ON \
               ${{matrix.cmake_configurations}} \
diff --git a/.github/workflows/linux-simple-builds.yml b/.github/workflows/linux-simple-builds.yml
index 5017e8fa..72e3bd9d 100644
--- a/.github/workflows/linux-simple-builds.yml
+++ b/.github/workflows/linux-simple-builds.yml
@@ -89,6 +89,7 @@ jobs:
         cmake -Bbuild -H$GITHUB_WORKSPACE \
               -DCMAKE_BUILD_TYPE=${{matrix.build_type}} \
               -DCMAKE_CXX_STANDARD=${{matrix.std}} \
+              -DCMAKE_CXX_STANDARD_REQUIRED=ON \
               -DCMAKE_CXX_EXTENSIONS=OFF \
               -DCATCH_DEVELOPMENT_BUILD=ON \
               -G Ninja
diff --git a/.github/workflows/mac-builds.yml b/.github/workflows/mac-builds.yml
index 39908f43..955b81fc 100644
--- a/.github/workflows/mac-builds.yml
+++ b/.github/workflows/mac-builds.yml
@@ -33,8 +33,11 @@ jobs:
       #       This is important
       run: |
         cmake -Bbuild -H$GITHUB_WORKSPACE \
-              -DCMAKE_BUILD_TYPE=${{matrix.build_type}} -DCMAKE_CXX_STANDARD=${{matrix.std}} \
-              -DCATCH_DEVELOPMENT_BUILD=ON -DCATCH_BUILD_EXAMPLES=${{matrix.examples}} \
+              -DCMAKE_BUILD_TYPE=${{matrix.build_type}} \
+              -DCMAKE_CXX_STANDARD=${{matrix.std}} \
+              -DCMAKE_CXX_STANDARD_REQUIRED=ON \
+              -DCATCH_DEVELOPMENT_BUILD=ON \
+              -DCATCH_BUILD_EXAMPLES=${{matrix.examples}} \
               -DCATCH_BUILD_EXTRA_TESTS=${{matrix.examples}}
 
     - name: Build tests + lib