diff --git a/.github/workflows/release-20231016-update.yml b/.github/workflows/release-20231016-update.yml
deleted file mode 100644
index e763fb35..00000000
--- a/.github/workflows/release-20231016-update.yml
+++ /dev/null
@@ -1,15 +0,0 @@
-name: Release 5.10 Toolchains
-
-on:
-  workflow_dispatch:
-
-jobs:
-  # Each job builds a release toolchain for a specific Swift version.
-  build-release-20231016:
-    # Note: GitHub requires the use of an 'owner/repo' path before the
-    # workflow file path when we want to use a workflow from another branch.
-    uses: thebrowsercompany/swift-build/.github/workflows/swift-toolchain.yml@hyp/20231016-update
-    secrets:
-      SYMBOL_SERVER_PAT: ${{ secrets.SYMBOL_SERVER_PAT }}
-      CERTIFICATE: ${{ secrets.CERTIFICATE }}
-      PASSPHRASE: ${{ secrets.PASSPHRASE }}