diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7ce6b40cf..541ddb6bd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,16 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
+## 0.13.3 (May 6th, 2021)
+
+### Added
+
+- Support HTTP/2 prior knowledge, using `httpcore.SyncConnectionPool(http1=False)`. (Pull #333)
+
+### Fixed
+
+- Handle cases where environment does not provide `select.poll` support. (Pull #331)
+
 ## 0.13.2 (April 29th, 2021)
 
 ### Added
diff --git a/httpcore/__init__.py b/httpcore/__init__.py
index 91972d6dc..e03a76484 100644
--- a/httpcore/__init__.py
+++ b/httpcore/__init__.py
@@ -51,7 +51,7 @@
     "WriteError",
     "WriteTimeout",
 ]
-__version__ = "0.13.2"
+__version__ = "0.13.3"
 
 __locals = locals()