diff --git a/lower-constraints.txt b/lower-constraints.txt
index a228819f3..117b697ce 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -82,7 +82,6 @@ requests-mock==1.2.0
 requestsexceptions==1.2.0
 rfc3986==0.3.1
 Routes==2.3.1
-simplejson==3.5.1
 smmap==0.9.0
 statsd==3.2.1
 stevedore==2.0.1
diff --git a/requirements.txt b/requirements.txt
index d231ed542..b93814eba 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,5 +8,4 @@ oslo.i18n>=3.15.3 # Apache-2.0
 oslo.serialization!=2.19.1,>=2.18.0 # Apache-2.0
 oslo.utils>=3.33.0 # Apache-2.0
 PrettyTable>=0.7.2 # BSD
-simplejson>=3.5.1 # MIT
 stevedore>=2.0.1 # Apache-2.0