diff --git a/releasenotes/notes/fix-replication-detach-a21f29c89d089f9b.yaml b/releasenotes/notes/fix-replication-detach-a21f29c89d089f9b.yaml
new file mode 100644
index 0000000000..a9c0d99ad7
--- /dev/null
+++ b/releasenotes/notes/fix-replication-detach-a21f29c89d089f9b.yaml
@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    Fix a bug where replications failed to detach from the source instance
+    because of the upgrade of the sqlachemy library.
diff --git a/trove/guestagent/datastore/mysql_common/service.py b/trove/guestagent/datastore/mysql_common/service.py
index 7198f6c3f4..d875f61b27 100644
--- a/trove/guestagent/datastore/mysql_common/service.py
+++ b/trove/guestagent/datastore/mysql_common/service.py
@@ -815,7 +815,7 @@ class BaseMySqlApp(service.BaseDbApp):
         replication_user = None
         with mysql_util.SqlClient(self.get_engine()) as client:
             result = client.execute(text('SHOW SLAVE STATUS'))
-            replication_user = result.first()['Master_User']
+            replication_user = result.first()._mapping['Master_User']
             client.execute(text('STOP SLAVE'))
             client.execute(text('RESET SLAVE ALL'))
             self.wait_for_slave_status('OFF', client, 180)