diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 400592b..98e5b2d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,48 +9,25 @@ on:
 jobs:
   build:
 
-    # compilation of zimg v2.8 and v2.9 fails on ubuntu-22.04 for some reason
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     strategy:
       matrix:
         include:
-          # this is a matrix of all 3.8-3.11 VapourSynth versions
-          - python-version: '3.8'
-            vapoursynth-version: '49'
-          - python-version: '3.8'
-            vapoursynth-version: '50'
-          - python-version: '3.8'
-            vapoursynth-version: '51'
-          - python-version: '3.8'
-            vapoursynth-version: '52'
-          - python-version: '3.9'
-            vapoursynth-version: '53'
-          - python-version: '3.9'
-            vapoursynth-version: '54'
+          # this is a matrix of all supported VapourSynth versions
           - python-version: '3.9'
             vapoursynth-version: '55'
           - python-version: '3.9'
             vapoursynth-version: '56'
           - python-version: '3.9'
             vapoursynth-version: '57'
-          - python-version: '3.8'
-            vapoursynth-version: '58'
           - python-version: '3.10'
             vapoursynth-version: '58'
-          - python-version: '3.8'
-            vapoursynth-version: '59'
           - python-version: '3.10'
             vapoursynth-version: '59'
-          - python-version: '3.8'
-            vapoursynth-version: '60'
           - python-version: '3.10'
             vapoursynth-version: '60'
-          - python-version: '3.8'
-            vapoursynth-version: '61'
           - python-version: '3.10'
             vapoursynth-version: '61'
-          - python-version: '3.8'
-            vapoursynth-version: '62'
           - python-version: '3.11'
             vapoursynth-version: '62'