diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 120d48c..f14564b 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -41,6 +41,8 @@ python -m unittest -v tests/test_evcharging.py
 
 ## Building PyPI package
 
+First, increment the version number in pyproject.toml. Then, follow these commands:
+
 ```bash
 # create a conda environment with appropriate build tools
 conda env update --file env_build.yml --prune
diff --git a/pyproject.toml b/pyproject.toml
index 9f91b86..3695328 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "sustaingym"
-version = "0.1.5"
+version = "0.1.6"
 authors = [
   { name="Christopher Yeh", email="cyeh@caltech.edu" },
 ]