diff --git a/Doxygen b/Doxygen
index 6e2b07ec9..017bb5aa6 100644
--- a/Doxygen
+++ b/Doxygen
@@ -38,7 +38,7 @@ PROJECT_NAME           = "ESPHome"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 2023.3.0-dev
+PROJECT_NUMBER         = 2023.4.0-dev
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a
diff --git a/_static/version b/_static/version
index 49b1cfc07..46bed8ae6 100644
--- a/_static/version
+++ b/_static/version
@@ -1 +1 @@
-2023.3.0-dev
\ No newline at end of file
+2023.4.0-dev
\ No newline at end of file
diff --git a/conf.py b/conf.py
index a848ff807..53868d966 100644
--- a/conf.py
+++ b/conf.py
@@ -67,9 +67,9 @@ author = "ESPHome"
 # built documents.
 #
 # The short X.Y version.
-version = "2023.3"
+version = "2023.4"
 # The full version, including alpha/beta/rc tags.
-release = "2023.3.0-dev"
+release = "2023.4.0-dev"
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.