diff --git a/xtendr/xtendrbase.py b/xtendr/xtendrbase.py
index 19b7fb8..316bb55 100644
--- a/xtendr/xtendrbase.py
+++ b/xtendr/xtendrbase.py
@@ -1,7 +1,3 @@
-import importlib
-import sys
-import os
-import json
 from abc import ABC, abstractmethod
 
 class XtendRBase(ABC):
diff --git a/xtendr/xtendrsystem.py b/xtendr/xtendrsystem.py
index db6f925..5c334ab 100644
--- a/xtendr/xtendrsystem.py
+++ b/xtendr/xtendrsystem.py
@@ -2,7 +2,6 @@ import importlib
 import sys
 import os
 import json
-from abc import ABC, abstractmethod
 from xtendr.xtendrbase import XtendRBase
 
 class XtendRSystem: