diff --git a/CHANGELOG.md b/CHANGELOG.md
index b4f0a08..a56f3b6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,11 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to
 [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+# [2.1.9] - 2023-05-09
+
+### Changed
+- Fixed a bug where detection of legacy csv is wrong
+
 # [2.1.8] - 2023-05-09
 
 ### Changed
diff --git a/setup.py b/setup.py
index 06a9551..a93247c 100644
--- a/setup.py
+++ b/setup.py
@@ -6,7 +6,7 @@
 
 setup(
     name='deeplc',
-    version='2.1.8',
+    version='2.1.9',
     license='apache-2.0',
     description='DeepLC: Retention time prediction for (modified) peptides using Deep Learning.',
     long_description=LONG_DESCRIPTION,