From 0d7292ec734d49def118959d6a80588e7c0f7a39 Mon Sep 17 00:00:00 2001
From: Takashi Kokubun <takashikkbn@gmail.com>
Date: Sun, 16 Oct 2022 22:02:47 -0700
Subject: [PATCH] Leave only the oldest Visual Studio in AppVeyor (#6561)

---
 .appveyor.yml | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/.appveyor.yml b/.appveyor.yml
index 0d2c5b1607..9d3cb3f613 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -20,13 +20,11 @@ skip_commits:
 environment:
   ruby_version: "24-%Platform%"
   matrix:
+    # Test only the oldest supported version because AppVeyor is unstable, its concurrency
+    # is limited, and compatibility issues that happen only in newer versions are rare.
+    # You may test some other stuff on GitHub Actions instead.
     - build: vs
       vs: 120
-      ssl: OpenSSL
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-      GEMS_FOR_TEST: ""
-    - build: vs
-      vs: 140
       ssl: OpenSSL-v111
       APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       GEMS_FOR_TEST: ""