diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 7acc60e2..d6cb8287 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -44,9 +44,9 @@ jobs:
       fail-fast: false
       matrix:
         # https://ruby-lang.org/en/downloads/branches
-        ruby: ["3.3", "3.2", "3.1"]
+        ruby: ["3.3"]
         # https://www.postgresql.org/support/versioning/
-        pg: [12-master, 13-master, 14-master, 15-master, 16-master]
+        pg: [16-master]
     steps:
       - name: Set Up Actions
         uses: actions/checkout@v4
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 24ae171c..cd650116 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -135,3 +135,15 @@ def reset_spatial_store
     end
   end
 end
+
+conn = SpatialModel.lease_connection.instance_variable_get(:@raw_connection)
+$count = conn.conninfo_hash[:port].count(",")+1
+
+TracePoint.trace(:call) do |tp|
+	conn = SpatialModel.lease_connection.instance_variable_get(:@raw_connection)
+	count = conn.conninfo_hash[:port].count(",")+1
+	next if count == $count
+
+	$count = count
+	puts "port(count=#{count}): #{conn.conninfo_hash[:port][0, 100]}"
+end