diff --git a/CHANGELOG.md b/CHANGELOG.md
index 59daacef..4d693bf6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,19 @@
+# 4.18.0 (July 24, 2025)
+
+## Feature Added
+- Dynamic occupancy: groups of exposed + infected may now be defined.
+Model and calculator updated, and tests added. Documentation still to
+be updated. User interface mostly unchanged (the new feature is not
+visible there).
+
+## Bug Fixes
+- Fix in profiler to adapt to a non back-compatible change in pyinstrument
+package.
+- Type ignored in the expert app.
+
+## Other
+- Update of mypy, pytest-mypy and pyinstrument dependencies (version).
+
 # 4.17.8 (March 13, 2025)
 
 ## Bug Fixes
diff --git a/caimira/pyproject.toml b/caimira/pyproject.toml
index 924a6be5..891eb53d 100644
--- a/caimira/pyproject.toml
+++ b/caimira/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "caimira"
-version = "4.17.8"
+version = "4.18.0"
 description = "CAiMIRA - CERN Airborne Model for Indoor Risk Assessment"
 readme = "README.md"
 license = { text = "Apache-2.0" }
diff --git a/cern_caimira/pyproject.toml b/cern_caimira/pyproject.toml
index 82b06056..029c6a80 100644
--- a/cern_caimira/pyproject.toml
+++ b/cern_caimira/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "cern-caimira"
-version = "4.17.8"
+version = "4.18.0"
 description = "CAiMIRA - CERN Airborne Model for Indoor Risk Assessment"
 license = { text = "Apache-2.0" }
 authors = [