diff --git a/.github/workflows/ubuntu-pyston.yml b/.github/workflows/ubuntu-pyston.yml
index 40039c391..08158986d 100644
--- a/.github/workflows/ubuntu-pyston.yml
+++ b/.github/workflows/ubuntu-pyston.yml
@@ -8,7 +8,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-20.04
     strategy:
       matrix:
         pyston-version: [2.3.5]
@@ -16,9 +16,9 @@ jobs:
     - uses: actions/checkout@v3
     - name: Set up Pyston ${{ matrix.pyston-version }}
       run: |
-        wget https://github.com/pyston/pyston/releases/download/pyston_2.3.4/pyston_2.3.4_20.04_amd64.deb
+        wget https://github.com/pyston/pyston/releases/download/pyston_2.3.5/pyston_2.3.5_20.04_amd64.deb
         sudo apt-get install tk8.6-blt2.5 libffi7
-        sudo dpkg -i pyston_2.3.4_20.04_amd64.deb
+        sudo dpkg -i pyston_2.3.5_20.04_amd64.deb
     - name: Install dependencies
       run: |
         sudo apt-get update -qq && sudo apt-get install -qq liblapack-dev llvm-11 llvm-11-dev libopenblas0 tesseract-ocr
@@ -34,11 +34,10 @@ jobs:
         wget https://github.com/Mathics3/mathics-omnibus/raw/mathics-6.x/docker/src/scikit_image-0.19.3-pyston38-pyston_23_x86_64_linux_gnu-linux_x86_64.whl
         wget https://github.com/Mathics3/mathics-omnibus/raw/mathics-6.x/docker/src/matplotlib-3.5.2-pyston38-pyston_23_x86_64_linux_gnu-linux_x86_64.whl
         wget https://github.com/Mathics3/mathics-omnibus/raw/mathics-6.x/docker/src/PyWavelets-1.3.0-pyston38-pyston_23_x86_64_linux_gnu-linux_x86_64.whl
-        # Scipy wheel does not work....
-        wget www2.fisica.unlp.edu.ar/~matera/scipy-1.7.3-pyston38-pyston_23_x86_64_linux_gnu-linux_x86_64.whl
+        wget https://github.com/Mathics3/mathics-omnibus/blob/master/docker/src/scipy-1.10.1-pyston38-pyston_23_x86_64_linux_gnu-linux_x86_64.whl
         wget https://github.com/Mathics3/mathics-omnibus/raw/mathics-6.x/docker/src/pyzmq-23.2.0-pyston38-pyston_23_x86_64_linux_gnu-linux_x86_64.whl
         pip install numpy-1.24.0-pyston38-pyston_23_x86_64_linux_gnu-linux_x86_64.whl
-        pip install scipy-1.7.3-pyston38-pyston_23_x86_64_linux_gnu-linux_x86_64.whl
+        pip install scipy-1.10.1-pyston38-pyston_23_x86_64_linux_gnu-linux_x86_64.whl
         pip install PyWavelets-1.3.0-pyston38-pyston_23_x86_64_linux_gnu-linux_x86_64.whl
         pip install Pillow-9.2.0-pyston38-pyston_23_x86_64_linux_gnu-linux_x86_64.whl
         pip install matplotlib-3.5.2-pyston38-pyston_23_x86_64_linux_gnu-linux_x86_64.whl