diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 540d335c..2194904f 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -8,7 +8,7 @@ on:
 
 jobs:
   linux_tests:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
 
     strategy:
       fail-fast: true