diff --git a/ChangeLog.md b/ChangeLog.md
index f730312b..18bd8769 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,7 +1,8 @@
 Emperor ChangeLog
 =================
 
-# Emperor 1.0.3-dev (changes since 1.0.3 go here)
+# Emperor 1.0.4 (10 Jul 2023)
+-----------------------------
 
 ### Bug Fixes
 
diff --git a/doc/source/conf.py b/doc/source/conf.py
index 6e9633be..8271e168 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -58,10 +58,10 @@
 # built documents.
 #
 # The short X.Y version.
-version = '1.0.3-dev'
+version = '1.0.4'
 
 # The full version, including alpha/beta/rc tags.
-release = '1.0.3-dev'
+release = '1.0.4'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/setup.py b/setup.py
index a6f2a397..ce3ecc2a 100644
--- a/setup.py
+++ b/setup.py
@@ -9,7 +9,7 @@
 
 from setuptools import setup, find_packages
 
-__version__ = "1.0.3-dev"
+__version__ = "1.0.4"
 __maintainer__ = "Emperor development team"
 __email__ = "yoshiki89@gmail.com"