diff --git a/doc/requirements.txt b/doc/requirements.txt
index 2123e2ea..2e254a83 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,4 +1,4 @@
-sphinx>=2.0.0,!=2.1.0 # BSD
+sphinx>=2.0.0 # BSD
 sphinxcontrib-svg2pdfconverter>=0.1.0 # BSD
 reno>=3.1.0 # Apache-2.0
 openstackdocstheme>=2.2.1 # Apache-2.0
diff --git a/requirements.txt b/requirements.txt
index 24adf8bd..edd8c399 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-pbr!=2.1.0,>=2.0.0 # Apache-2.0
+pbr>=2.0.0 # Apache-2.0
 cryptography>=2.7 # BSD/Apache-2.0
 python-barbicanclient>=5.5.0 # Apache-2.0
 oslo.config>=6.4.0 # Apache-2.0
@@ -8,4 +8,4 @@ oslo.log>=3.36.0 # Apache-2.0
 oslo.utils>=3.33.0 # Apache-2.0
 stevedore>=1.20.0 # Apache-2.0
 keystoneauth1>=3.4.0 # Apache-2.0
-requests>=2.18.0,!=2.20.0 # Apache-2.0
+requests>=2.18.0 # Apache-2.0
diff --git a/test-requirements.txt b/test-requirements.txt
index 9595bf16..59b2487b 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,4 +1,4 @@
-coverage!=4.4,>=4.0 # Apache-2.0
+coverage>=4.0 # Apache-2.0
 python-barbicanclient>=4.5.2 # Apache-2.0
 requests-mock>=1.2.0 # Apache-2.0
 python-subunit>=1.0.0 # Apache-2.0/BSD