diff --git a/doc/requirements.txt b/doc/requirements.txt
index 1489bcee..10d3b9fb 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,3 +1,3 @@
-sphinx>=2.0.0,!=2.1.0 # BSD
+sphinx>=2.1.1 # BSD
 openstackdocstheme>=2.2.1 # Apache-2.0
 reno>=3.1.0 # Apache-2.0
diff --git a/requirements.txt b/requirements.txt
index 2be002e7..63268403 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,13 +1,13 @@
 # Requirements lower bounds listed here are our best effort to keep them up to
 # date but we do not test them so no guarantee of having them all correct. If
 # you find any incorrect lower bounds, let us know or propose a fix.
-pbr!=2.1.0,>=2.0.0 # Apache-2.0
+pbr>=3.0.0 # Apache-2.0
 oslo.concurrency>=3.20.0 # Apache-2.0
 oslo.config>=5.1.0 # Apache-2.0
 oslo.log>=3.30.0 # Apache-2.0
 oslo.i18n>=3.15.3 # Apache-2.0
 oslo.privsep>=1.23.0 # Apache-2.0
-oslo.serialization!=2.19.1,>=2.18.0 # Apache-2.0
+oslo.serialization>=2.20.0 # Apache-2.0
 oslo.utils>=2.0.0  # Apache-2.0
 oslo.versionedobjects>=1.28.0 # Apache-2.0
 ovsdbapp>=0.12.1 # Apache-2.0
diff --git a/test-requirements.txt b/test-requirements.txt
index 62ac6f1f..b1978344 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,4 +1,4 @@
-coverage!=4.4,>=4.0 # Apache-2.0
+coverage>=4.4.1 # Apache-2.0
 oslotest>=1.10.0 # Apache-2.0
 ovs>=2.9.2
 stestr>=3.1.0 # Apache-2.0