diff --git a/.github/workflows/cmake_macos.yml b/.github/workflows/cmake_macos.yml
index 45b5f2f3e..5a6a26752 100644
--- a/.github/workflows/cmake_macos.yml
+++ b/.github/workflows/cmake_macos.yml
@@ -43,7 +43,7 @@ jobs:
           ${{ runner.os }}-pip-
 
     - name: Clone PHARE
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         submodules: 'recursive'
 
diff --git a/.github/workflows/cmake_ubuntu.yml b/.github/workflows/cmake_ubuntu.yml
index 5da4b0955..504fa2949 100644
--- a/.github/workflows/cmake_ubuntu.yml
+++ b/.github/workflows/cmake_ubuntu.yml
@@ -15,6 +15,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
+        cc: [gcc, clang]
 
     steps:
     - name: Build Info
@@ -40,7 +41,7 @@ jobs:
           ${{ runner.os }}-pip-
 
     - name: Clone PHARE
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         submodules: 'recursive'
 
@@ -68,10 +69,11 @@ jobs:
       run: cmake -E make_directory ${{runner.workspace}}/build
 
     - name: Configure CMake
-      # builds samrai with 2 threads as it does not OOM (yet)
       working-directory: ${{runner.workspace}}/build
       run: |
         set -ex
+        export CC=gcc CXX=g++
+        [ "${{ matrix.cc }}" = "clang" ] && export CC=clang CXX=clang++
         cmake $GITHUB_WORKSPACE
         cd ${{runner.workspace}}/PHARE/subprojects/samrai && mkdir build && cd build
         cmake .. -DENABLE_SAMRAI_TESTS=OFF -DCMAKE_BUILD_TYPE=RelWithDebInfo
@@ -86,8 +88,7 @@ jobs:
 
     - name: Build
       working-directory: ${{runner.workspace}}/build
-      run: |
-        cmake --build . # OOM if more threads
+      run: cmake --build . -j 2
 
     - name: Test
       working-directory: ${{runner.workspace}}/build
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index e45ae0ea9..76318cbed 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -29,7 +29,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           submodules: recursive
 
@@ -38,14 +38,14 @@ jobs:
         run: mkdir build; cd build; cmake .. -Dphare_configurator=ON
 
       - name: Initialize CodeQL
-        uses: github/codeql-action/init@v2
+        uses: github/codeql-action/init@v3
         with:
           config-file: ./.github/codeql-config.yml
           languages: ${{ matrix.language }}
           queries: +security-and-quality
 
       - name: Autobuild
-        uses: github/codeql-action/autobuild@v2
+        uses: github/codeql-action/autobuild@v3
         if: ${{ matrix.language == 'python' }}
 
       - name: Build cpp
@@ -53,6 +53,6 @@ jobs:
         run: cd build; make
 
       - name: Perform CodeQL Analysis
-        uses: github/codeql-action/analyze@v2
+        uses: github/codeql-action/analyze@v3
         with:
           category: "/language:${{ matrix.language }}"
diff --git a/tests/amr/data/particles/copy/test_particledata_copyNd.cpp b/tests/amr/data/particles/copy/test_particledata_copyNd.cpp
index 86ce92e6d..2e0b3531f 100644
--- a/tests/amr/data/particles/copy/test_particledata_copyNd.cpp
+++ b/tests/amr/data/particles/copy/test_particledata_copyNd.cpp
@@ -142,7 +142,7 @@ TYPED_TEST(AParticlesDataND, PreservesAllParticleAttributesAfterCopy)
 TYPED_TEST(AParticlesDataND, copiesDataWithOverlapNoTransform)
 {
     static constexpr auto dim = TypeParam{}();
-    auto dimension            = SAMRAI::tbox::Dimension{this->dim};
+    auto dimension            = SAMRAI::tbox::Dimension{dim};
 
     // now, with an overlap as union of 2 boxes
     //