diff --git a/global-requirements.txt b/global-requirements.txt
index 2551f5311d..e7ea57f9b7 100644
--- a/global-requirements.txt
+++ b/global-requirements.txt
@@ -131,7 +131,7 @@ django-nose
 docutils==0.9.1
 feedparser
 fixtures>=0.3.14
-flake8==2.0
+flake8==2.0,==2.1.0
 hacking>=0.8.0,<0.9
 hgtools # dependency of pytest-runner that is only in setup_requires
 hp3parclient>=3.0,<4.0
@@ -149,10 +149,10 @@ nosexcover
 openstack-doc-tools>=0.8.2
 openstack.nose_plugin>=0.7
 oslosphinx
-pep8==1.4.5
+pep8==1.4.5,==1.4.6
 proboscis==1.2.5.3
 psycopg2
-pyflakes>=0.7.2,<0.7.4
+pyflakes>=0.7.2,<0.7.4,==0.8.1
 pylint==0.25.2
 pysendfile==2.0.0
 pysqlite