diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index 7e1c61b8..e82257a7 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -20,7 +20,6 @@ jobs:
     name: Unit tests
     uses: apple/swift-nio/.github/workflows/unit_tests.yml@main
     with:
-      linux_5_8_enabled: false
       linux_5_9_enabled: false
       linux_5_10_enabled: false
       linux_nightly_6_0_arguments_override: "--explicit-target-dependency-import-check error"