diff --git a/src/python_testing/TC_CGEN_2_8.py b/src/python_testing/TC_CGEN_2_8.py
index abef5a3fc67dda..5b51a0faaa1f1e 100644
--- a/src/python_testing/TC_CGEN_2_8.py
+++ b/src/python_testing/TC_CGEN_2_8.py
@@ -131,6 +131,9 @@ async def test_TC_CGEN_2_8(self):
             "First CommissioningComplete failed",
         )
 
+        # Close the commissioner session with the device to clean up resources
+        commissioner.CloseSession(nodeid=self.dut_node_id)
+
         # Step 5: Factory reset is handled by test operator
         self.step(5)
         if not self.check_pics('PICS_USER_PROMPT'):
diff --git a/src/python_testing/TC_CGEN_2_9.py b/src/python_testing/TC_CGEN_2_9.py
index 03521e5dd89b38..fb5ddfbdb9075e 100644
--- a/src/python_testing/TC_CGEN_2_9.py
+++ b/src/python_testing/TC_CGEN_2_9.py
@@ -159,6 +159,9 @@ async def test_TC_CGEN_2_9(self):
         self.step(5)
         await self.remove_commissioner_fabric()
 
+        # Close the commissioner session with the device to clean up resources
+        commissioner.CloseSession(nodeid=self.dut_node_id)
+
         # Step 6: Put device in commissioning mode (requiring user input, so skip in CI)
         self.step(6)
         if not self.check_pics('PICS_USER_PROMPT'):