diff --git a/.github/workflows/integration-test.yml b/.github/workflows/integration-test.yml
index 5f5afe7..373cf16 100644
--- a/.github/workflows/integration-test.yml
+++ b/.github/workflows/integration-test.yml
@@ -12,37 +12,76 @@ on:
 
 jobs:
 
-#  ubuntu-test:
-#    runs-on: ubuntu-20.04
+  ubuntu-test:
+    runs-on: ubuntu-20.04
+    strategy:
+      fail-fast: true
+      matrix:
+        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "3.11"]
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Cache dependencies (soplex)
+        id: cache-soplex
+        uses: actions/cache@v3
+        with:
+          path: |
+            ${{ runner.workspace }}/PySoPlex
+          key: ${{ runner.os }}-soplex-${{ env.version }}-${{ hashFiles('**/lockfiles') }}
+          restore-keys: |
+            ${{ runner.os }}-soplex-${{ env.version }}-
+
+      - name: Install dependencies (soplex)
+        if: steps.cache-soplex.outputs.cache-hit != 'true'
+        run: |
+          sudo apt-get update
+          sudo apt-get install git cmake gcc g++
+          git clone -b master https://github.com/scipopt/soplex.git
+          cd soplex
+          mkdir build
+          cd build
+          cmake ../ -DCMAKE_INSTALL_PREFIX=./install
+          make -j
+          make install
+
+      - name: Setup python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Prepare python environment
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install cython wheel pytest
+
+      - name: Install PySoPlex
+        run: |
+          export SOPLEX_DIR=${{ runner.workspace }}/PySoPlex/soplex/build/install
+          python -m pip install .
+
+      - name: Run pysoplex tests
+        run: |
+          export SOPLEX_DIR=${{ runner.workspace }}/PySoPlex/soplex/build/install
+          py.test
+
+#  windows-test:
+#    runs-on: windows-latest
 #    strategy:
-#      fail-fast: true
 #      matrix:
-#        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "3.11"]
+#        python-version: ["3.10", "3.11"]
 #    steps:
 #      - uses: actions/checkout@v3
 #
-#      - name: Cache dependencies (soplex)
-#        id: cache-soplex
-#        uses: actions/cache@v3
-#        with:
-#          path: |
-#            ${{ runner.workspace }}/PySoPlex
-#          key: ${{ runner.os }}-soplex-${{ env.version }}-${{ hashFiles('**/lockfiles') }}
-#          restore-keys: |
-#            ${{ runner.os }}-soplex-${{ env.version }}-
-#
 #      - name: Install dependencies (soplex)
-#        if: steps.cache-soplex.outputs.cache-hit != 'true'
+#        shell: powershell
 #        run: |
-#          sudo apt-get update
-#          sudo apt-get install git cmake gcc g++
 #          git clone -b C_interface_update https://github.com/scipopt/soplex.git
 #          cd soplex
 #          mkdir build
 #          cd build
-#          cmake ../ -DCMAKE_INSTALL_PREFIX=./install
-#          make -j
-#          make install
+#          cmake -DCMAKE_INSTALL_PREFIX=install -DCMAKE_BUILD_TYPE=Release -DMT=on ..
+#          cmake --build . --config Release
+#          cmake --install .
 #
 #      - name: Setup python ${{ matrix.python-version }}
 #        uses: actions/setup-python@v4
@@ -50,62 +89,23 @@ jobs:
 #          python-version: ${{ matrix.python-version }}
 #
 #      - name: Prepare python environment
+#        shell: powershell
 #        run: |
 #          python -m pip install --upgrade pip
 #          python -m pip install cython wheel pytest
 #
 #      - name: Install PySoPlex
+#        shell: powershell
 #        run: |
-#          export SOPLEX_DIR=${{ runner.workspace }}/PySoPlex/soplex/build/install
+#          $Env:SOPLEX_DIR = "${{ runner.workspace }}\PySoPlex\soplex\build\install"
 #          python -m pip install .
 #
 #      - name: Run pysoplex tests
+#        shell: powershell
 #        run: |
-#          export SOPLEX_DIR=${{ runner.workspace }}/PySoPlex/soplex/build/install
+#          $Env:PATH = "${{ runner.workspace }}\PySoPlex\soplex\build\install\bin;%PATH%"
 #          py.test
 
-  windows-test:
-    runs-on: windows-latest
-    strategy:
-      matrix:
-        python-version: ["3.10", "3.11"]
-    steps:
-      - uses: actions/checkout@v3
-
-      - name: Install dependencies (soplex)
-        shell: powershell
-        run: |
-          git clone -b C_interface_update https://github.com/scipopt/soplex.git
-          cd soplex
-          mkdir build
-          cd build
-          cmake -DCMAKE_INSTALL_PREFIX=install -DCMAKE_BUILD_TYPE=Release -DMT=on ..
-          cmake --build . --config Release
-          cmake --install .
-
-      - name: Setup python ${{ matrix.python-version }}
-        uses: actions/setup-python@v4
-        with:
-          python-version: ${{ matrix.python-version }}
-
-      - name: Prepare python environment
-        shell: powershell
-        run: |
-          python -m pip install --upgrade pip
-          python -m pip install cython wheel pytest
-
-      - name: Install PySoPlex
-        shell: powershell
-        run: |
-          $Env:SOPLEX_DIR = "${{ runner.workspace }}\PySoPlex\soplex\build\install"
-          python -m pip install .
-
-      - name: Run pysoplex tests
-        shell: powershell
-        run: |
-          $Env:PATH = "${{ runner.workspace }}\PySoPlex\soplex\build\install\bin;%PATH%"
-          py.test
-
 #  mac-test:
 #    runs-on: macos-latest
 #    strategy: