diff --git a/.gitattributes b/.gitattributes
index 14c3c359..84c7add0 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,3 +1,4 @@
 /Tests export-ignore
 /phpunit.xml.dist export-ignore
-/.git* export-ignore
+/.gitattributes export-ignore
+/.gitignore export-ignore
diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
deleted file mode 100644
index 4689c4da..00000000
--- 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/symfony
-
-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 16be48ba..00000000
--- a/.github/workflows/check-subtree-split.yml
+++ /dev/null
@@ -1,37 +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/symfony
-
-          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"
-            });
-          }
diff --git a/Process.php b/Process.php
index c804a179..bf2e8e85 100644
--- a/Process.php
+++ b/Process.php
@@ -1211,7 +1211,7 @@ public static function isTtySupported(): bool
     {
         static $isTtySupported;
 
-        return $isTtySupported ??= ('/' === \DIRECTORY_SEPARATOR && stream_isatty(\STDOUT));
+        return $isTtySupported ??= ('/' === \DIRECTORY_SEPARATOR && stream_isatty(\STDOUT) && @is_writable('/dev/tty'));
     }
 
     /**
diff --git a/Tests/ExecutableFinderTest.php b/Tests/ExecutableFinderTest.php
index a0f62273..a1b8d6d5 100644
--- a/Tests/ExecutableFinderTest.php
+++ b/Tests/ExecutableFinderTest.php
@@ -99,12 +99,16 @@ public function testFindWithOpenBaseDir()
         }
 
         putenv('PATH='.\dirname(\PHP_BINARY));
-        $this->iniSet('open_basedir', \dirname(\PHP_BINARY).\PATH_SEPARATOR.'/');
+        $initialOpenBaseDir = ini_set('open_basedir', \dirname(\PHP_BINARY).\PATH_SEPARATOR.'/');
 
-        $finder = new ExecutableFinder();
-        $result = $finder->find($this->getPhpBinaryName());
+        try {
+            $finder = new ExecutableFinder();
+            $result = $finder->find($this->getPhpBinaryName());
 
-        $this->assertSamePath(\PHP_BINARY, $result);
+            $this->assertSamePath(\PHP_BINARY, $result);
+        } finally {
+            ini_set('open_basedir', $initialOpenBaseDir);
+        }
     }
 
     public function testFindBatchExecutableOnWindows()