diff --git a/.github/workflows/docker-image.yml b/.github/workflows/docker-image.yml
index f2c3561..f8109ae 100644
--- a/.github/workflows/docker-image.yml
+++ b/.github/workflows/docker-image.yml
@@ -30,13 +30,22 @@ jobs:
   timescaledb:
 
     name: PG${{ matrix.pg }}${{ matrix.oss }}
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     strategy:
       fail-fast: false
       matrix:
         pg: [14, 15, 16, 17]
         oss: [ "", "-oss" ]
     steps:
+      # The github runners have a lot of space in /mnt, but apparently not enough in /. This step removes about 13G.
+      - name: remove unneeded runner software
+        run: |
+          df -h
+          du -chs     /usr/share/dotnet /usr/local/lib/android /opt/microsoft || true
+          sudo rm -fr /usr/share/dotnet /usr/local/lib/android /opt/microsoft || true
+          sudo docker image prune --all --force || true
+          df -h
+
       - uses: actions/checkout@v4
 
       - name: Set up QEMU
diff --git a/.github/workflows/smoke-test.yml b/.github/workflows/smoke-test.yml
index 473fdf9..8cd97bd 100644
--- a/.github/workflows/smoke-test.yml
+++ b/.github/workflows/smoke-test.yml
@@ -24,6 +24,15 @@ jobs:
         pg: [14, 15, 16, 17]
         type: ['normal']
     steps:
+      # The github runners have a lot of space in /mnt, but apparently not enough in /. This step removes about 13G.
+      - name: remove unneeded runner software
+        run: |
+          df -h
+          du -chs     /usr/share/dotnet /usr/local/lib/android /opt/microsoft || true
+          sudo rm -fr /usr/share/dotnet /usr/local/lib/android /opt/microsoft || true
+          sudo docker image prune --all --force || true
+          df -h
+
       - name: Check out the source
         uses: actions/checkout@v4