diff --git a/Dockerfile b/Dockerfile
index 64ab56a..8ad7595 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 # Base OS
 FROM python:3.9-slim-buster
 
-ARG VERSION=0.1.36
+ARG VERSION=0.1.37
 ARG SIMULATOR_VERSION="1.6.6"
 
 # metadata
diff --git a/biosimulators_gillespy2/_version.py b/biosimulators_gillespy2/_version.py
index 997791c..da9d669 100644
--- a/biosimulators_gillespy2/_version.py
+++ b/biosimulators_gillespy2/_version.py
@@ -1 +1 @@
-__version__ = '0.1.36'
+__version__ = '0.1.37'
diff --git a/requirements.txt b/requirements.txt
index 250e203..4523b4f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 biosimulators_utils[logging] >= 0.1.151
-gillespy2 >= 1.6.0
+gillespy2 >= 1.6.0, <= 1.6.6 # 1.6.7 introduces bug
 kisao
 lxml
 numpy