diff --git a/tx_test.go b/tx_test.go
index 265131f9..6a5e2d3f 100644
--- a/tx_test.go
+++ b/tx_test.go
@@ -263,6 +263,10 @@ func TestBeginIsoLevels(t *testing.T) {
 	conn := mustConnectString(t, os.Getenv("PGX_TEST_DATABASE"))
 	defer closeConn(t, conn)
 
+	if conn.PgConn().ParameterStatus("crdb_version") != "" {
+		t.Skip("Server always uses SERIALIZABLE isolation (https://www.cockroachlabs.com/docs/stable/demo-serializable.html)")
+	}
+
 	isoLevels := []pgx.TxIsoLevel{pgx.Serializable, pgx.RepeatableRead, pgx.ReadCommitted, pgx.ReadUncommitted}
 	for _, iso := range isoLevels {
 		tx, err := conn.BeginTx(context.Background(), pgx.TxOptions{IsoLevel: iso})