diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 85fed7d..7cd661e 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -27,16 +27,11 @@ jobs:
     name: Ruby ${{ matrix.ruby }} (${{ matrix.appraisal }})
     strategy:
       matrix:
-        ruby: ["3.1", "3.2", "3.3", "3.4"]
-        appraisal: ["rails_7.1", "rails_7.2", "rails_8.0", "rails_8.1"]
-        exclude:
-          - ruby: "3.1"
-            appraisal: "rails_8.0"
-          - ruby: "3.1"
-            appraisal: "rails_8.1"
+        ruby: ["3.4"]
+        appraisal: ["rails_8.1"]
     services:
       postgres:
-        image: postgres:17
+        image: postgres:15
         env:
           POSTGRES_DB: active_fields_dummy_test
           PGUSER: postgres # Fixes 'FATAL:  role "root" does not exist'