diff --git a/tracetools_analysis/tracetools_analysis/utils/ros2.py b/tracetools_analysis/tracetools_analysis/utils/ros2.py
index 012ed36..2af4899 100644
--- a/tracetools_analysis/tracetools_analysis/utils/ros2.py
+++ b/tracetools_analysis/tracetools_analysis/utils/ros2.py
@@ -16,10 +16,8 @@
 """Module for ROS data model utils."""
 
 from typing import Any
-from typing import Dict
 from typing import List
 from typing import Mapping
-from typing import Set
 from typing import Union
 
 from pandas import DataFrame