From 4ab4139792192c064a4ee6e0a858c555e8c6a771 Mon Sep 17 00:00:00 2001
From: Derek Bender <170351+djbender@users.noreply.github.com>
Date: Thu, 2 Jul 2026 10:19:41 -0700
Subject: [PATCH] Fix ruby-head CI: use its built-in bundler instead of the
 Gemfile.lock pin

ruby-head nightlies now ship bundler 4.1.0.dev as a default gem, but
setup-ruby's default bundler resolution forces the repo's pinned
BUNDLED WITH 4.0.13 onto every matrix leg, corrupting the head install
(Bundler::CorruptBundlerInstallError). Override bundler: default for
the head leg so it uses its own bundled version.
---
 .github/workflows/ci.yml | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a59f6c1..fb948da 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,11 +14,12 @@ jobs:
 
     strategy:
       matrix:
-        ruby-version:
-          - '3.3'
-          - '3.4'
-          - '4.0'
-          - 'head'
+        include:
+          - ruby-version: '3.3'
+          - ruby-version: '3.4'
+          - ruby-version: '4.0'
+          - ruby-version: 'head'
+            bundler: default
 
     steps:
     - uses: actions/checkout@v7.0.0
@@ -27,6 +28,7 @@ jobs:
       uses: ruby/setup-ruby@v1.314.0
       with:
         ruby-version: ${{ matrix.ruby-version }}
+        bundler: ${{ matrix.bundler || 'Gemfile.lock' }}
         bundler-cache: true
 
     - name: Run tests