diff --git a/bigchaindb/backend/mongodb/query.py b/bigchaindb/backend/mongodb/query.py
index 7539d070..d1ca397b 100644
--- a/bigchaindb/backend/mongodb/query.py
+++ b/bigchaindb/backend/mongodb/query.py
@@ -1,7 +1,6 @@
 """Query implementation for MongoDB"""
 
 from time import time
-from itertools import chain
 
 from pymongo import ReturnDocument
 from pymongo import errors
diff --git a/tests/common/test_transaction.py b/tests/common/test_transaction.py
index e4417cbb..b4ef427c 100644
--- a/tests/common/test_transaction.py
+++ b/tests/common/test_transaction.py
@@ -958,7 +958,6 @@ def test_cant_add_empty_output():
 
 
 def test_cant_add_empty_input():
-    import bigchaindb.version
     from bigchaindb.common.transaction import Transaction
     tx = Transaction(Transaction.CREATE, None)