diff --git a/requirements.txt b/requirements.txt
index 03bda26..866765c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-pbr>=0.6,!=0.7,<1.0
-oslosphinx
-sphinx>=1.1.2,!=1.2.0,<1.3
+pbr>=1.6  # Apache-2.0
+oslosphinx>=2.5.0,!=3.4.0  # Apache-2.0
+sphinx>=1.1.2,!=1.2.0,!=1.3b1,<1.3  # BSD
 yasfb>=0.5.1