diff --git a/HISTORY.rst b/HISTORY.rst
index b4d454c..6e20ab0 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -1,7 +1,7 @@
 History
 =======
 
-2.2.4 (unreleased)
+2.2.4 (2024-02-06)
 ------------------
 
 - Substance count regex fix
diff --git a/threedigrid/__init__.py b/threedigrid/__init__.py
index ff61fce..584566f 100644
--- a/threedigrid/__init__.py
+++ b/threedigrid/__init__.py
@@ -1,3 +1,3 @@
 # Threedigrid version number is automatic updated with zest.releaser
 # the version number in setup.py is updated using the find_version()
-__version__ = "2.2.4.dev0"
+__version__ = "2.2.4"