diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index df0832b..e8db2e3 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         php_version: [7.2]
-        laravel_version: [5.*,6.*, 7.*]
+        laravel_version: [5.5.*,6.*, 7.*]
 
     steps:
       - name: Checkout commit
diff --git a/tests/Tests/AggregateJoinTest.php b/tests/Tests/AggregateJoinTest.php
index 6acc9c9..8fe3dc1 100644
--- a/tests/Tests/AggregateJoinTest.php
+++ b/tests/Tests/AggregateJoinTest.php
@@ -8,20 +8,13 @@
 
 class AggregateJoinTest extends TestCase
 {
-    public function setUp(): void
-    {
-        $this->markTestSkipped('skip for now.');
-    }
-
-    private $queryTest = 'select orders.*, SUM(sellers.id) as sort 
+    private $queryTest = 'select orders.*, SUM("sellers"."id") as sort 
             from "orders" 
             left join "sellers" on "sellers"."id" = "orders"."seller_id" 
             where "orders"."deleted_at" is null 
             group by "orders"."id" 
             order by sort asc';
 
-    private $bindingsTest = ['sellers.id'];
-
     public function testAvg()
     {
         Order::joinRelations('seller')
@@ -30,7 +23,6 @@ public function testAvg()
 
         $queryTest = str_replace(EloquentJoinBuilder::AGGREGATE_SUM, EloquentJoinBuilder::AGGREGATE_SUM, $this->queryTest);
         $this->assertQueryMatches($queryTest, $this->fetchQuery());
-        $this->assertEquals($this->bindingsTest, $this->fetchBindings());
     }
 
     public function testSum()
@@ -41,7 +33,6 @@ public function testSum()
 
         $queryTest = str_replace(EloquentJoinBuilder::AGGREGATE_SUM, EloquentJoinBuilder::AGGREGATE_AVG, $this->queryTest);
         $this->assertQueryMatches($queryTest, $this->fetchQuery());
-        $this->assertEquals($this->bindingsTest, $this->fetchBindings());
     }
 
     public function testMax()
@@ -52,7 +43,6 @@ public function testMax()
 
         $queryTest = str_replace(EloquentJoinBuilder::AGGREGATE_SUM, EloquentJoinBuilder::AGGREGATE_MAX, $this->queryTest);
         $this->assertQueryMatches($queryTest, $this->fetchQuery());
-        $this->assertEquals($this->bindingsTest, $this->fetchBindings());
     }
 
     public function testMin()
@@ -63,7 +53,6 @@ public function testMin()
 
         $queryTest = str_replace(EloquentJoinBuilder::AGGREGATE_SUM, EloquentJoinBuilder::AGGREGATE_MIN, $this->queryTest);
         $this->assertQueryMatches($queryTest, $this->fetchQuery());
-        $this->assertEquals($this->bindingsTest, $this->fetchBindings());
     }
 
     public function testCount()
@@ -74,6 +63,5 @@ public function testCount()
 
         $queryTest = str_replace(EloquentJoinBuilder::AGGREGATE_SUM, EloquentJoinBuilder::AGGREGATE_COUNT, $this->queryTest);
         $this->assertQueryMatches($queryTest, $this->fetchQuery());
-        $this->assertEquals($this->bindingsTest, $this->fetchBindings());
     }
 }