diff --git a/.github/ci_env.yml b/.github/ci_env.yml
index 3cb913d..5de2b6f 100644
--- a/.github/ci_env.yml
+++ b/.github/ci_env.yml
@@ -3,4 +3,3 @@ channels:
   - conda-forge
 dependencies:
   - cookiecutter
-
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index a904dc5..9f6f576 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -85,6 +85,9 @@ jobs:
       - name: install mamba
         uses: mamba-org/setup-micromamba@v1
         with:
+          init-shell: >-
+            powershell
+            cmd.exe
           environment-file: .github/ci_env.yml
 
       - name: micromamba shell hook
@@ -104,13 +107,13 @@ jobs:
           micromamba activate xeus_cookiecutter_test_env
 
       - name: install cxx compiler
-        shell: cmd
+        shell: cmd /C CALL {0}
         run: |
           call C:\Users\runneradmin\micromamba-root\condabin\micromamba.bat activate xeus_cookiecutter_test_env
           call C:\Users\runneradmin\micromamba-root\condabin\micromamba.bat install cxx-compiler -c conda-forge -y
 
       - name: cmake configure
-        shell: cmd
+        shell: cmd /C CALL {0}
         run: |
           call C:\Users\runneradmin\micromamba-root\condabin\micromamba.bat activate xeus_cookiecutter_test_env
           cd xeus-mylang
@@ -119,7 +122,7 @@ jobs:
           cmake .. -G "NMake Makefiles" -DCMAKE_BUILD_TYPE=Release -DXEUS_BUILD_TESTS=ON -DDEPENDENCY_SEARCH_PREFIX="%CONDA_PREFIX%\Library" -DCMAKE_PREFIX_PATH="%CONDA_PREFIX%\Library" -DCMAKE_INSTALL_PREFIX="%CONDA_PREFIX%"
 
       - name: build
-        shell: cmd
+        shell: cmd /C CALL {0}
         run: |
           call C:\Users\runneradmin\micromamba-root\condabin\micromamba.bat activate xeus_cookiecutter_test_env
           cd xeus-mylang/bld
@@ -127,7 +130,7 @@ jobs:
           nmake install
 
       - name: test
-        shell: cmd
+        shell: cmd /C CALL {0}
         run: |
           call C:\Users\runneradmin\micromamba-root\condabin\micromamba.bat activate xeus_cookiecutter_test_env
           cd xeus-mylang/test
@@ -225,7 +228,7 @@ jobs:
             -DCMAKE_INSTALL_PREFIX=$GITHUB_WORKSPACE/custom_sysroot \
             -Dnlohmann_json_DIR=$GITHUB_WORKSPACE/custom_sysroot/lib/cmake/nlohmann_json \
             -Dxtl_DIR=$GITHUB_WORKSPACE/custom_sysroot/share/cmake/xtl \
-            -Dxeus_DIR=$GITHUB_WORKSPACE/custom_sysroot/lib/cmake/xeus 
+            -Dxeus_DIR=$GITHUB_WORKSPACE/custom_sysroot/lib/cmake/xeus
 
           emmake make -j2
           emmake make -j2 install