diff --git a/requirements.txt b/requirements.txt
index b13e0681b..b41cdc9a8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,8 +2,8 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
-apscheduler # MIT License
-enum34;python_version=='2.7' or python_version=='2.6' or python_version=='3.3' # BSD
+apscheduler>=3.0.5 # MIT License
+enum34>=1.0.4;python_version=='2.7' or python_version=='2.6' or python_version=='3.3' # BSD
 jsonpatch>=1.16 # BSD
 keystoneauth1>=3.2.0 # Apache-2.0
 jsonschema<3.0.0,>=2.6.0 # MIT
diff --git a/test-requirements.txt b/test-requirements.txt
index 0341836c6..360c571d2 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -3,7 +3,7 @@
 # process, which may cause wedges in the gate later.
 
 coverage!=4.4,>=4.0 # Apache-2.0
-doc8 # Apache-2.0
+doc8>=0.6.0 # Apache-2.0
 freezegun>=0.3.6 # Apache-2.0
 hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
 mock>=2.0.0 # BSD