diff --git a/src/Illuminate/Foundation/Testing/RefreshDatabase.php b/src/Illuminate/Foundation/Testing/RefreshDatabase.php
index f039c510f8c2..28626ec5e706 100644
--- a/src/Illuminate/Foundation/Testing/RefreshDatabase.php
+++ b/src/Illuminate/Foundation/Testing/RefreshDatabase.php
@@ -85,12 +85,30 @@ protected function refreshTestDatabase()
 
             $this->app[Kernel::class]->setArtisan(null);
 
+            $this->updateLocalCacheOfInMemoryDatabases();
+
             RefreshDatabaseState::$migrated = true;
         }
 
         $this->beginDatabaseTransaction();
     }
 
+    /**
+     * Update locally cached in-memory PDO connections after migration.
+     *
+     * @return void
+     */
+    protected function updateLocalCacheOfInMemoryDatabases()
+    {
+        $database = $this->app->make('db');
+
+        foreach ($this->connectionsToTransact() as $name) {
+            if ($this->usingInMemoryDatabase($name)) {
+                RefreshDatabaseState::$inMemoryConnections[$name] = $database->connection($name)->getPdo();
+            }
+        }
+    }
+
     /**
      * Migrate the database.
      *