diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6209d72..a3fed02 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/) 
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## 2.3.3 - 2020-10-02
+
+### Fixed
+- Thread of heartbeat was set as daemon after start.
+
 ## 2.3.2 - 2020-09-24
 
 ### Fixed
diff --git a/pyclowder/connectors.py b/pyclowder/connectors.py
index b15e8b5..cfb130e 100644
--- a/pyclowder/connectors.py
+++ b/pyclowder/connectors.py
@@ -877,8 +877,8 @@ def start_thread(self, json_body):
         }
         """
         self.thread = threading.Thread(target=self._process_message, args=(json_body,))
-        self.thread.start()
         self.thread.setDaemon(True)
+        self.thread.start()
 
     def is_finished(self):
         with self.lock:
diff --git a/setup.py b/setup.py
index ee7189e..571e5f6 100644
--- a/setup.py
+++ b/setup.py
@@ -9,7 +9,7 @@ def description():
 
 
 setup(name='pyclowder',
-      version='2.3.2',
+      version='2.3.3',
       packages=find_packages(),
       description='Python SDK for the Clowder Data Management System',
       long_description=description(),