diff --git a/HISTORY.rst b/HISTORY.rst
index eda783f35..029c24407 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -380,4 +380,8 @@ History
 1.11.8 (2024-03-23)
 +++++++++++++++++++
 * faster lens equation solver with constant convergence
-* decoupled multi-plane formalism
\ No newline at end of file
+* decoupled multi-plane formalism
+
+1.11.9 (2024-04-05)
++++++++++++++++++++
+* COOLEST format with external convergence implemented
diff --git a/lenstronomy/__init__.py b/lenstronomy/__init__.py
index 68c6a050f..300eb7c15 100644
--- a/lenstronomy/__init__.py
+++ b/lenstronomy/__init__.py
@@ -1,6 +1,6 @@
 __author__ = "lenstronomy developers"
 __email__ = "lenstronomy-dev@googlegroups.com"
-__version__ = "1.11.8"
+__version__ = "1.11.9"
 __credits__ = "lenstronomy developers"
 
 from .Util.package_util import short, laconic
diff --git a/setup.py b/setup.py
index 4124d3dc3..a587ddbdf 100644
--- a/setup.py
+++ b/setup.py
@@ -75,13 +75,13 @@ def run_tests(self):
 
 setup(
     name="lenstronomy",
-    version="1.11.8",
+    version="1.11.9",
     description="Strong lens modeling package.",
     long_description=desc,
     author="lenstronomy developers",
     author_email="lenstronomy-dev@googlegroups.com",
     url="https://github.com/lenstronomy/lenstronomy",
-    download_url="https://github.com/lenstronomy/lenstronomy/archive/1.11.8.tar.gz",
+    download_url="https://github.com/lenstronomy/lenstronomy/archive/1.11.9.tar.gz",
     packages=find_packages(PACKAGE_PATH, "test"),
     package_dir={"lenstronomy": "lenstronomy"},
     include_package_data=True,