diff --git a/.gitattributes b/.gitattributes
deleted file mode 100644
index 8253128..0000000
--- a/.gitattributes
+++ /dev/null
@@ -1 +0,0 @@
-/.git* export-ignore
diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
deleted file mode 100644
index 1325301..0000000
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ /dev/null
@@ -1,8 +0,0 @@
-Please do not submit any Pull Requests here. They will be closed.
----
-
-Please submit your PR here instead:
-https://github.com/symfony/polyfill
-
-This repository is what we call a "subtree split": a read-only subset of that main repository.
-We're looking forward to your PR there!
diff --git a/.github/workflows/check-subtree-split.yml b/.github/workflows/check-subtree-split.yml
deleted file mode 100644
index efc1432..0000000
--- a/.github/workflows/check-subtree-split.yml
+++ /dev/null
@@ -1,33 +0,0 @@
-name: Check subtree split
-on:
-  pull_request_target:
-jobs:
-  close-pull-request:
-    runs-on: ubuntu-latest
-    steps:
-    - name: Close pull request
-      uses: actions/github-script@v6
-      with:
-        script: |
-          if (context.repo.owner === "symfony") {
-            github.rest.issues.createComment({
-              owner: "symfony",
-              repo: context.repo.repo,
-              issue_number: context.issue.number,
-              body: `
-          Thanks for your Pull Request! We love contributions.
-
-          However, you should instead open your PR on the main repository:
-          https://github.com/symfony/polyfill
-
-          This repository is what we call a "subtree split": a read-only subset of that main repository.
-          We're looking forward to your PR there!
-          `
-            });
-            github.rest.pulls.update({
-              owner: "symfony",
-              repo: context.repo.repo,
-              pull_number: context.issue.number,
-              state: "closed"
-            });
-          }