diff --git a/.github/workflows/build-container.yml b/.github/workflows/build-container.yml
index 83f7f74..4156ca2 100644
--- a/.github/workflows/build-container.yml
+++ b/.github/workflows/build-container.yml
@@ -11,6 +11,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
 
+    # From <https://github.com/actions/runner-images/issues/2840>
+    - name: Free up disk space
+      run: |
+        sudo rm -rf /usr/share/dotnet
+        sudo rm -rf /opt/ghc
+        sudo rm -rf "/usr/local/share/boost"
+        sudo rm -rf "$AGENT_TOOLSDIRECTORY"
+
     - name: checkout files in repo
       uses: actions/checkout@v3