diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index d4801df..4853051 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -22,19 +22,20 @@ jobs:
     steps:
       - name: Checkout CyIpopt
         uses: actions/checkout@v3
-      - uses: conda-incubator/setup-miniconda@v2
+      - uses: conda-incubator/setup-miniconda@v3
         with:
           auto-update-conda: true
           activate-environment: test-environment
           python-version: ${{ matrix.python-version }}
           channels: conda-forge
-          miniforge-variant: Mambaforge
+          conda-remove-defaults: "true"
+          miniforge-version: latest
       - name: Install basic dependencies
-        run: mamba install -y -v lapack "libblas=*=*netlib" "cython>=0.29.28" "ipopt=${{ matrix.ipopt-version }}" numpy>=1.25 pkg-config>=0.29.2 setuptools>=44.1.1 --file docs/requirements.txt
+        run: conda install -y -v lapack "libblas=*=*netlib" "cython>=0.29.28" "ipopt=${{ matrix.ipopt-version }}" numpy>=1.25 pkg-config>=0.29.2 setuptools>=44.1.1 --file docs/requirements.txt
       - name: Install CyIpopt
         run: |
           rm pyproject.toml
           python -m pip install .
-          mamba list
+          conda list
       - name: Test building documentation
         run: cd docs && make clean && make html && cd ..
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index b1d250c..49de015 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -14,7 +14,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        # TODO : Move to macos-latet which is an arm image, but then the old
+        # ipopts will not be available, see: https://github.com/actions/runner-images?tab=readme-ov-file#available-images
+        os: [ubuntu-latest, macos-13, windows-latest]
         python-version: ['3.9', '3.10', '3.11', '3.12']
         ipopt-version: ['3.12', '3.13', '3.14']
         exclude:
@@ -25,27 +27,28 @@ jobs:
         shell: bash -l {0}
     steps:
       - name: Checkout CyIpopt
-        uses: actions/checkout@v3
-      - uses: conda-incubator/setup-miniconda@v2
+        uses: actions/checkout@v4
+      - uses: conda-incubator/setup-miniconda@v3
         with:
           auto-update-conda: true
           activate-environment: test-environment
           python-version: ${{ matrix.python-version }}
           channels: conda-forge
-          miniforge-variant: Mambaforge
+          conda-remove-defaults: "true"
+          miniforge-version: latest
       - name: Install basic dependencies against generic blas/lapack
         run: |
-          mamba install -q -y "ipopt=${{ matrix.ipopt-version }}" "numpy>=1.25" "pkg-config>=0.29.2" "setuptools>=44.1.1" "cython>=0.29.28" "pytest>=6.2.5"
+          conda install -q -y "ipopt=${{ matrix.ipopt-version }}" "numpy>=1.25" "pkg-config>=0.29.2" "setuptools>=44.1.1" "cython>=0.29.28" "pytest>=6.2.5"
       - run: echo "IPOPTWINDIR=USECONDAFORGEIPOPT" >> $GITHUB_ENV
       - name: Install cyipopt
         run: |
           rm pyproject.toml
           python -m pip install --no-deps --no-build-isolation .
-          mamba list
+          conda list
       - name: Test with pytest and run examples
         run: |
           python -c "import cyipopt"
-          mamba list
+          conda list
           pytest
           python examples/hs071.py
           python examples/exception_handling.py
@@ -55,6 +58,6 @@ jobs:
         # Ipopt needed different libfortrans.
         if: (matrix.ipopt-version != '3.12' && matrix.python-version != '3.11') || (matrix.ipopt-version != '3.12' && matrix.python-version != '3.10' && matrix.os != 'macos-latest')
         run: |
-          mamba install -q -y -c conda-forge "ipopt=${{ matrix.ipopt-version }}" "numpy>=1.25" "pkg-config>=0.29.2" "setuptools>=44.1.1" "scipy>1.8.0" "pytest>=6.2.5" "cython=0.29.*"
-          mamba list
+          conda install -q -y -c conda-forge "ipopt=${{ matrix.ipopt-version }}" "numpy>=1.25" "pkg-config>=0.29.2" "setuptools>=44.1.1" "scipy>1.8.0" "pytest>=6.2.5" "cython=0.29.*"
+          conda list
           pytest