diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 925b5e2a..c2ace783 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,7 +8,7 @@ env:
   OTP_VERSION: 22.3.4.7 # OTP version used during package publishing
   RELEVANT_FILES: "mix.lock mix.exs lib priv config test" # Important, this controls the caching, make sure to keep this right
   REPOSITORY: grpc
-  RUNNER_OS: ubuntu22 # Must match Elixir/OTP version in described in action erlef/setup-beam@v1
+  RUNNER_OS: ubuntu18 # Must match Elixir/OTP version in described in action erlef/setup-beam@v1
   SHA: ${{ github.sha }}
 
 concurrency:
@@ -36,7 +36,10 @@ jobs:
       matrix:
         otp: [20.3.8.26, 21.3.8.24, 22.3.4.7]
         elixir: [1.9.4, 1.10.4]
-        runner-os: [ubuntu20]
+        runner-os: [ubuntu18]
+        exclude:
+          - elixir: 1.10.4
+            otp: 20.3.8.26
     steps:
       - name: Checkout latest codebase
         uses: actions/checkout@v4
@@ -109,7 +112,10 @@ jobs:
       matrix:
         otp: [20.3.8.26, 21.3.8.24, 22.3.4.7]
         elixir: [1.9.4, 1.10.4]
-        runner-os: [ubuntu20]
+        runner-os: [ubuntu18]
+        exclude:
+          - elixir: 1.10.4
+            otp: 20.3.8.26
     steps:
       - name: Checkout latest codebase
         uses: actions/checkout@v4