diff --git a/.github/workflows/ubuntu-pyston.yml b/.github/workflows/ubuntu-pyston.yml
index 3c18c387e..cbac8366d 100644
--- a/.github/workflows/ubuntu-pyston.yml
+++ b/.github/workflows/ubuntu-pyston.yml
@@ -26,12 +26,12 @@ jobs:
         sudo pyston -m pip install --upgrade pip
         sudo LLVM_CONFIG=/usr/lib/llvm-11/bin/llvm-config  pyston -m pip install llvmlite
         # Download wheels for heavy packages from mathics-omnibus
-        wget https://github.com/Mathics3/mathics-omnibus/raw/master/docker/src/Pillow-10.0.0-cp310-cp310-manylinux_2_28_x86_64.whl 
-        wget https://github.com/Mathics3/mathics-omnibus/raw/master/docker/src/numpy-1.25.1-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
-        wget https://github.com/Mathics3/mathics-omnibus/blob/master/docker/src/scipy-1.10.1-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
-        pip install numpy-1.25.1-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
-        pip install scipy-1.10.1-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
-        pip install Pillow-10.0.0-cp310-cp310-manylinux_2_28_x86_64.whl
+        wget https://github.com/Mathics3/mathics-omnibus/raw/mathics-6.x/docker/src/Pillow-9.2.0-pyston38-pyston_23_x86_64_linux_gnu-linux_x86_64.whl
+	wget https://github.com/Mathics3/mathics-omnibus/raw/mathics-6.x/docker/src/numpy-1.24.0-pyston38-pyston_23_x86_64_linux_gnu-linux_x86_64.whl
+	wget https://github.com/Mathics3/mathics-omnibus/blob/mathics-6.x/docker/src/scipy-1.9.3-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-1.9.3-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
     - name: Install Mathics with minimal dependencies
       run: |
         make develop