From 25d1bbff796f25dee32d6b6051afe6915a0f49e2 Mon Sep 17 00:00:00 2001
From: Takumi Shotoku <sinsoku.listy@gmail.com>
Date: Sun, 10 May 2026 21:26:09 +0900
Subject: [PATCH] Use bundled Bundler on ruby-head in CI

Released Bundler is broken on ruby-head due to ruby/ruby#16895.
The fix (rubygems/rubygems#9529) has not been released yet.
---
 .github/workflows/main.yml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index bb5d5020..e493c299 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -27,6 +27,10 @@ jobs:
             rubyopt: "--enable-frozen-string-literal"
     runs-on: ubuntu-latest
     timeout-minutes: 10
+    env:
+      # Released Bundler is broken on ruby-head due to ruby/ruby#16895.
+      # Use Ruby's bundled Bundler until rubygems/rubygems#9529 is released.
+      BUNDLER_VERSION: ${{ case(matrix.ruby == 'head', '0', '') }}
     steps:
     - uses: actions/checkout@v4
     - name: Set up Ruby