diff --git a/lower-constraints.txt b/lower-constraints.txt
index 463c557c..d9941d6c 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -14,7 +14,7 @@ contextlib2==0.4.0
 coverage==4.0
 cryptography==2.1
 debtcollector==1.2.0
-decorator==3.4.0
+decorator==4.3.0
 deprecation==1.0
 docutils==0.11
 dogpile.cache==0.6.2
diff --git a/requirements.txt b/requirements.txt
index 52693db9..40149bb9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,6 +4,7 @@
 
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
 
+decorator>=4.3.0 # BSD
 eventlet!=0.18.3,!=0.20.1,>=0.18.2 # MIT
 netaddr>=0.7.18 # BSD
 tenacity>=4.4.0 # Apache-2.0