diff --git a/setup.py b/setup.py
index 595e5954..438f643a 100644
--- a/setup.py
+++ b/setup.py
@@ -8,7 +8,7 @@
 
 setup(
     name="prometheus_client",
-    version="0.20.0",
+    version="0.21.0",
     author="Brian Brazil",
     author_email="brian.brazil@robustperception.io",
     description="Python client for the Prometheus monitoring system.",