diff --git a/slack_bolt/version.py b/slack_bolt/version.py
index 2dc804083..fc65357c8 100644
--- a/slack_bolt/version.py
+++ b/slack_bolt/version.py
@@ -1,2 +1,2 @@
 """Check the latest version at https://pypi.org/project/slack-bolt/"""
-__version__ = "1.18.1"
+__version__ = "1.19.0rc1"