diff --git a/esphome/const.py b/esphome/const.py
index ff8510b40e..99cb53fe4b 100644
--- a/esphome/const.py
+++ b/esphome/const.py
@@ -1,6 +1,6 @@
 """Constants used by esphome."""
 
-__version__ = "2021.11.0-dev"
+__version__ = "2021.12.0-dev"
 
 ALLOWED_NAME_CHARS = "abcdefghijklmnopqrstuvwxyz0123456789-_"