diff --git a/.github/workflows/osx-yml-notyet b/.github/workflows/osx.yml
similarity index 100%
rename from .github/workflows/osx-yml-notyet
rename to .github/workflows/osx.yml
diff --git a/.github/workflows/ubuntu-pyston.yml b/.github/workflows/ubuntu-pyston.yml
index 0cb857ab7..751a7e2f1 100644
--- a/.github/workflows/ubuntu-pyston.yml
+++ b/.github/workflows/ubuntu-pyston.yml
@@ -11,9 +11,9 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        pyston-version: [2.3.4]
+        pyston-version: [2.3.5]
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - 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
@@ -50,8 +50,8 @@ jobs:
         pip install pyzmq-23.2.0-pyston38-pyston_23_x86_64_linux_gnu-linux_x86_64.whl
     - name: Install Mathics with full dependencies
       run: |
-        python -m pip install Mathics-Scanner
-        make develop-full
-    - name: Test Mathics
+        pyston -m pip install Mathics-Scanner
+        PYTHON=pyston make develop-full
+    - name: Test Mathics3
       run: |
         make -j3 PYTHON=pyston doctest
diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index e32d9b54b..76feddb7f 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -8,7 +8,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     strategy:
       matrix:
         python-version: ['3.11', '3.8', '3.9', '3.10']
diff --git a/.github/workflows/windows.yml-notyet b/.github/workflows/windows.yml
similarity index 100%
rename from .github/workflows/windows.yml-notyet
rename to .github/workflows/windows.yml