diff --git a/scenarios/tag-and-markers.json b/scenarios/tag-and-markers.json
index 31cf255d..d8f509e8 100644
--- a/scenarios/tag-and-markers.json
+++ b/scenarios/tag-and-markers.json
@@ -92,6 +92,9 @@
                 "a==1.0.0"
             ]
         },
+        "environment": {
+            "python": "3.12"
+        },
         "packages": {
             "a": {
                 "versions": {