diff --git a/requirements-dev.txt b/requirements-dev.txt
index c5790946..25acf4f6 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,9 +1,9 @@
-flake8
-coverage
-sphinx
+flake8==3.0.4
+coverage==4.2
+sphinx==1.4.6
 alabaster>=0.6.2
-aiohttp
-jinja2
-pytest
-pytest-cov
+aiohttp==1.0.2
+jinja2==2.8
+pytest==3.0.2
+pytest-cov==2.3.1
 -e .