diff --git a/.github/workflows/runtime.yml b/.github/workflows/runtime.yml
index 1bda255137b..0cbbf569b00 100644
--- a/.github/workflows/runtime.yml
+++ b/.github/workflows/runtime.yml
@@ -105,7 +105,7 @@ jobs:
       matrix:
         otp: ['20.3', '25.3', '26']
         elixir: ['1.15']
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
 
     steps:
 
@@ -165,6 +165,12 @@ jobs:
       matrix:
         otp: ['25.0', '26']
         elixir: ['1.14.0', '1.14.5', '1.15']
+        - otp: '25.0'
+          elixir: '1.14.5'
+        - otp: '25.0'
+          elixir: '1.15'
+        - otp: '26'
+          elixir: '1.14.0'
     runs-on: ubuntu-20.04
 
     steps: