diff --git a/src/nidm/core/dot.py b/src/nidm/core/dot.py
index 03f74bc..91647d1 100644
--- a/src/nidm/core/dot.py
+++ b/src/nidm/core/dot.py
@@ -11,7 +11,6 @@
 
 .. moduleauthor:: Sanu Ann Abraham <sanuann@mit.edu>
 """
-from __future__ import absolute_import, division, print_function, unicode_literals
 
 try:
     from html import escape
diff --git a/src/nidm/core/serializers/__init__.py b/src/nidm/core/serializers/__init__.py
index c6f698e..738c9e7 100644
--- a/src/nidm/core/serializers/__init__.py
+++ b/src/nidm/core/serializers/__init__.py
@@ -1,4 +1,3 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
 from prov import Error
 
 __author__ = "Trung Dong Huynh"
diff --git a/src/nidm/core/serializers/provonerdf.py b/src/nidm/core/serializers/provonerdf.py
index 856629f..2d3d0d5 100644
--- a/src/nidm/core/serializers/provonerdf.py
+++ b/src/nidm/core/serializers/provonerdf.py
@@ -1,6 +1,5 @@
 """PROVONE-RDF serializers for ProvONEDocument
 """
-from __future__ import absolute_import, division, print_function, unicode_literals
 import base64
 from collections import OrderedDict
 import datetime