diff --git a/docs/changelog.md b/docs/changelog.md
index 3b619423..133020ce 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -2,6 +2,10 @@
 
 This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html) and [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) format.
 
+## [1.9.1] -- 2024-07-18
+
+### Changed
+- ensure peppy requirement peppy>=0.40.0,<=0.40.2
 
 ## [1.9.0] -- 2024-06-26
 
diff --git a/looper/_version.py b/looper/_version.py
index 65d6992c..4e14cfd7 100644
--- a/looper/_version.py
+++ b/looper/_version.py
@@ -1,2 +1,2 @@
-__version__ = "1.9.0"
+__version__ = "1.9.1"
 # You must change the version in parser = pydantic2_argparse.ArgumentParser in cli_pydantic.py!!!
diff --git a/looper/cli_pydantic.py b/looper/cli_pydantic.py
index c6cda827..4efec218 100644
--- a/looper/cli_pydantic.py
+++ b/looper/cli_pydantic.py
@@ -336,7 +336,7 @@ def main(test_args=None) -> None:
         prog="looper",
         description="Looper: A job submitter for Portable Encapsulated Projects",
         add_help=True,
-        version="1.9.0",
+        version="1.9.1",
     )
 
     parser = add_short_arguments(parser, ArgumentEnum)
diff --git a/requirements/requirements-all.txt b/requirements/requirements-all.txt
index dd40fd1d..da94f546 100644
--- a/requirements/requirements-all.txt
+++ b/requirements/requirements-all.txt
@@ -6,7 +6,7 @@ logmuse>=0.2.0
 pandas>=2.0.2
 pephubclient>=0.4.0
 pipestat>=0.9.2
-peppy>=0.40.2
+peppy>=0.40.0,<=0.40.2
 pyyaml>=3.12
 rich>=9.10.0
 ubiquerg>=0.8.1a1