diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 76ad867..f20b633 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -32,3 +32,5 @@ jobs:
     with:
       runner_pool: nightly
       build_scheme: swift-nio-oblivious-http-Package
+      xcode_16_2_build_arguments_override: "-Xswiftc -Xfrontend -Xswiftc -require-explicit-sendable"
+      xcode_16_3_build_arguments_override: "-Xswiftc -Xfrontend -Xswiftc -require-explicit-sendable"
diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index 6dffe4c..8a91411 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -36,3 +36,5 @@ jobs:
     with:
       runner_pool: general
       build_scheme: swift-nio-oblivious-http-Package
+      xcode_16_2_build_arguments_override: "-Xswiftc -Xfrontend -Xswiftc -require-explicit-sendable"
+      xcode_16_3_build_arguments_override: "-Xswiftc -Xfrontend -Xswiftc -require-explicit-sendable"