diff --git a/test-requirements.txt b/test-requirements.txt
index 43052a6..8d374e5 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,5 +1,5 @@
-hacking>=3.0.1,<3.1.0 # Apache-2.0
-flake8-docstrings==1.6.0 # MIT
+hacking>=6.1.0,<6.2.0 # Apache-2.0
+flake8-import-order>=0.18.0,<0.19.0 # LGPLv3
 
 coverage!=4.4,>=4.0 # Apache-2.0
 fixtures>=3.0.0 # Apache-2.0/BSD
diff --git a/tox.ini b/tox.ini
index 84613a7..13f3d40 100644
--- a/tox.ini
+++ b/tox.ini
@@ -57,7 +57,10 @@ show-source = True
 # D208: Docstring is over-indented
 # D400: First line should end with a period
 # D401: First line should be in imperative mood
-# W503 line break before binary operator
-# W504 line break after binary operator
-ignore = H405,D100,D101,D102,D103,D104,D105,D107,D200,D202,D203,D204,D205,D208,D400,D401,W503,W504
+# I100: Import statements are in the wrong order.
+# I201: Missing newline between import groups.
+# I202: Additional newline in a group of imports.
+# W503: line break before binary operator
+# W504: line break after binary operator
+ignore = H405,D100,D101,D102,D103,D104,D105,D107,D200,D202,D203,D204,D205,D208,D400,D401,I100,I201,I202,W503,W504
 exclude = .tox,dist,doc,*.egg,build