diff --git a/CHANGELOG.md b/CHANGELOG.md
index da588ef..064ba57 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # CHANGELOG
 
+## v1.1.9 (2024-09-18)
+
+### Unknown
+
+* Merge branch 'master' of https://github.com/EBI-Metabolights/metabolights-utils ([`2c16d3c`](https://github.com/EBI-Metabolights/metabolights-utils/commit/2c16d3c425c53808d2558eadbdee9acb110b739c))
+
 ## v1.1.8 (2024-09-13)
 
 ### Fix
@@ -10,6 +16,10 @@
 
 * fix: id field is added to base class ([`ef682f4`](https://github.com/EBI-Metabolights/metabolights-utils/commit/ef682f45b9ec8e5a4c26790c339a1d78c87bace3))
 
+### Refactor
+
+* refactor: InvestigationFileWriter write method is now aware of inherited classes of Investigation model ([`1928d04`](https://github.com/EBI-Metabolights/metabolights-utils/commit/1928d04ca64cff1a982174b8f61a8d7c96c46658))
+
 ## v1.1.7 (2024-09-12)
 
 ### Unknown
diff --git a/metabolights_utils/__init__.py b/metabolights_utils/__init__.py
index 818c580..4fbcc93 100644
--- a/metabolights_utils/__init__.py
+++ b/metabolights_utils/__init__.py
@@ -158,7 +158,7 @@
 )
 from metabolights_utils.utils.search_utils import MetabolightsSearchUtils
 
-__VERSION__ = "1.1.8"
+__VERSION__ = "1.1.9"
 
 __all__ = [
     "Assay",
diff --git a/pyproject.toml b/pyproject.toml
index c6d625f..977bcbd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "metabolights-utils"
-version = "1.1.8"
+version = "1.1.9"
 description = "MetaboLights open metabolomics data repository utility tools and API."
 authors = ["MetaboLights Team <metabolights-dev@ebi.ac.uk>"]
 readme = "README.md"