diff --git a/requirements.txt b/requirements.txt
index f69657d..ed61eb8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,7 @@
-colorama==0.4.1; python_version <= "3.4"
+colorama==0.4.1; python_version >= "2.7" and python_version < "3.5"
+coverage==4.5.4; python_version < "3.5"
+importlib-metadata==0.23; python_version >= "2.7" and python_version < "3.5"
+more-itertools==7.2.0; python_version >= "3.4" and python_version < "3.5"
 pycodestyle==2.4.0; python_version < "2.7"
 pycodestyle==2.5.0; python_version >= "2.7"
 pytest==3.2.5; python_version < "2.7"
@@ -9,3 +12,4 @@ pytest-cov==2.8.1; python_version >= "2.7"
 pytest-mock==1.6.3; python_version < "2.7"
 pytest-mock==1.11.2; python_version >= "2.7"
 setuptools==36.8.0; python_version < "2.7"
+zipp==1.1.0; python_version < "3.6"