diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 149c5e9..0aa1e17 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -5,7 +5,7 @@ on: [push, pull_request, workflow_dispatch]
 
 jobs:
   build-and-run-tests:
-    runs-on: ubuntu-18.04     # this is a GitHub Runner, hosting the execution
+    runs-on: ubuntu-20.04     # this is a GitHub Runner, hosting the execution
     container: ubuntu:18.04   # but this is a Docker Hub container, in which everything runs
 
     services: