From 22b4d283fd142ca5303ef01ce991a6383f3bd5c2 Mon Sep 17 00:00:00 2001
From: Ilya Sytchev <isytchev@hsph.harvard.edu>
Date: Thu, 20 Jan 2022 20:13:21 -0500
Subject: [PATCH] Pin versions of GitHub-hosted runners

---
 .github/workflows/build.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 0174f56a..ffc4e16e 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -9,7 +9,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: ['ubuntu-20.04', 'windows-latest', 'macos-latest']
+        os: ['ubuntu-20.04', 'windows-2019', 'macos-11']
     steps:
       - name: Checkout Forest code from GitHub repo
         uses: actions/checkout@v2