diff --git a/.github/workflows/run-unit-tests.yml b/.github/workflows/run-unit-tests.yml
index 81517ded..2a8d6baa 100644
--- a/.github/workflows/run-unit-tests.yml
+++ b/.github/workflows/run-unit-tests.yml
@@ -4,6 +4,26 @@ on:
   workflow_dispatch:
   pull_request:
 jobs:
+  free-disk-space:
+    runs-on: ubuntu-latest
+    steps:
+
+    - name: Free Disk Space (Ubuntu)
+      uses: jlumbroso/free-disk-space@main
+      with:
+        # this might remove tools that are actually needed,
+        # if set to "true" but frees about 6 GB
+        tool-cache: false
+
+        # all of these default to true, but feel free to set to
+        # "false" if necessary for your workflow
+        android: true
+        dotnet: true
+        haskell: true
+        large-packages: true
+        docker-images: false
+        swap-storage: false
+
   docker-tests:
     name: "Run unit tests in docker"
     runs-on: ubuntu-latest