diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index ac211065..0f6b4cb1 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -75,6 +75,7 @@ jobs:
     with:
       runner_pool: nightly
       build_scheme: swift-openapi-runtime
+      swift_6_1_enabled: false
 
   release-builds:
     name: Release builds
diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index dd8d6924..87210f80 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -79,6 +79,7 @@ jobs:
     with:
       runner_pool: general
       build_scheme: swift-openapi-runtime
+      swift_6_1_enabled: false
 
   release-builds:
     name: Release builds