From 980b4c55b28e02346dd47f6e02ede490534c8e10 Mon Sep 17 00:00:00 2001
From: Dan Parizher <105245560+danparizher@users.noreply.github.com>
Date: Wed, 29 Oct 2025 17:37:39 -0400
Subject: [PATCH] [`ruff-ecosystem`] Fix CLI crash on Python 3.14 (#21092)

---
 .github/workflows/ci.yaml                   | 3 +--
 python/ruff-ecosystem/ruff_ecosystem/cli.py | 3 ++-
 scripts/check_ecosystem.py                  | 3 ++-
 3 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 7541b715a4..806949d81e 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -531,8 +531,7 @@ jobs:
           persist-credentials: false
       - uses: astral-sh/setup-uv@d0cc045d04ccac9d8b7881df0226f9e82c39688e # v6.8.0
         with:
-          # TODO: figure out why `ruff-ecosystem` crashes on Python 3.14
-          python-version: "3.13"
+          python-version: ${{ env.PYTHON_VERSION }}
           activate-environment: true
 
       - uses: actions/download-artifact@634f93cb2916e3fdff6788551b99b062d0335ce0 # v5.0.0
diff --git a/python/ruff-ecosystem/ruff_ecosystem/cli.py b/python/ruff-ecosystem/ruff_ecosystem/cli.py
index 6dda945a4b..b996504c22 100644
--- a/python/ruff-ecosystem/ruff_ecosystem/cli.py
+++ b/python/ruff-ecosystem/ruff_ecosystem/cli.py
@@ -87,7 +87,8 @@ def entrypoint():
     )
 
     with cache_context as cache:
-        loop = asyncio.get_event_loop()
+        loop = asyncio.new_event_loop()
+        asyncio.set_event_loop(loop)
         main_task = asyncio.ensure_future(
             main(
                 command=RuffCommand(args.ruff_command),
diff --git a/scripts/check_ecosystem.py b/scripts/check_ecosystem.py
index 824cdcc217..00b691dc51 100755
--- a/scripts/check_ecosystem.py
+++ b/scripts/check_ecosystem.py
@@ -528,7 +528,8 @@ if __name__ == "__main__":
     else:
         logging.basicConfig(level=logging.INFO)
 
-    loop = asyncio.get_event_loop()
+    loop = asyncio.new_event_loop()
+    asyncio.set_event_loop(loop)
     if args.checkouts:
         args.checkouts.mkdir(exist_ok=True, parents=True)
     main_task = asyncio.ensure_future(