diff --git a/requirements.txt b/requirements.txt
index 7f4089a..b3db22f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,4 +3,4 @@
 # process, which may cause wedges in the gate later.
 
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
-oslo.serialization>=1.10.0 # Apache-2.0
+oslo.serialization!=2.19.1,>=1.10.0 # Apache-2.0
diff --git a/test-requirements.txt b/test-requirements.txt
index fd918c2..114a6a7 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -5,10 +5,10 @@
 hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
 coverage!=4.4,>=4.0 # Apache-2.0
 python-subunit>=0.0.18 # Apache-2.0/BSD
-sphinx!=1.6.1,>=1.5.1 # BSD
+sphinx>=1.6.2 # BSD
 oslosphinx>=4.7.0 # Apache-2.0
 oslotest>=1.10.0 # Apache-2.0
 testrepository>=0.0.18 # Apache-2.0/BSD
 
 # releasenotes
-reno>=1.8.0 # Apache-2.0
+reno!=2.3.1,>=1.8.0 # Apache-2.0