diff --git a/conda-envs/environment-dev-py37.yml b/conda-envs/environment-dev-py37.yml
index 9b07b0f4af..63dc7029ec 100644
--- a/conda-envs/environment-dev-py37.yml
+++ b/conda-envs/environment-dev-py37.yml
@@ -28,4 +28,5 @@ dependencies:
 - sphinx>=1.5
 - typing-extensions
 - pip:
+  - polyagamma
   - sphinx-design
diff --git a/conda-envs/environment-dev-py38.yml b/conda-envs/environment-dev-py38.yml
index 17c3f42869..8a1a2b6bae 100644
--- a/conda-envs/environment-dev-py38.yml
+++ b/conda-envs/environment-dev-py38.yml
@@ -28,4 +28,5 @@ dependencies:
 - sphinx>=1.5
 - typing-extensions>=3.7.4
 - pip:
+  - polyagamma
   - sphinx-design
diff --git a/conda-envs/environment-dev-py39.yml b/conda-envs/environment-dev-py39.yml
index cbdc89390a..b17545a697 100644
--- a/conda-envs/environment-dev-py39.yml
+++ b/conda-envs/environment-dev-py39.yml
@@ -28,4 +28,5 @@ dependencies:
 - sphinx>=1.5
 - typing-extensions>=3.7.4
 - pip:
+  - polyagamma
   - sphinx-design
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 8582d96bd1..38c113656b 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -13,6 +13,7 @@ myst-nb
 numpy>=1.15.0,<1.22.0
 numpydoc>=0.9
 pandas
+polyagamma
 pre-commit>=2.8.0
 pydata-sphinx-theme
 pytest-cov>=2.5