From ca51c7c0a30237257c7798c2cb148c01ddcfc358 Mon Sep 17 00:00:00 2001
From: Andrew Davison <andrew.davison@cnrs.fr>
Date: Tue, 9 Jan 2024 22:57:01 +0100
Subject: [PATCH] older Python versions need an older os image

---
 .github/workflows/tests.yml | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 45172a6b..4b5000a0 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -5,11 +5,18 @@ on: [push, pull_request]
 jobs:
   build:
 
-    runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.4", "3.5", "3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
-
+        os: [ubuntu-latest]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+        include:
+          - os: "ubuntu-18.04"
+            python-version: "3.4"
+          - os: "ubuntu-18.04"
+            python-version: "3.5"
+          - os: "ubuntu-18.04"
+            python-version: "3.6"
+    runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v3
       - name: Set up Python ${{ matrix.python-version }}