diff --git a/CHANGELOG.md b/CHANGELOG.md
index ce88bc31b..ba3eff2ec 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 
-## [0.3.3] - 2024-11-07 21:30:00
+## [0.3.3] - 2024-11-07 23:00:00
 
 ### Added
 
diff --git a/changelog.yaml b/changelog.yaml
index f3992e1c0..62181ab69 100644
--- a/changelog.yaml
+++ b/changelog.yaml
@@ -212,4 +212,4 @@
   changes:
     added:
       - Updated and fixed Kentucky, Maryland, and Vermont parameters, variables and tests.
-  date: 2024-11-07 21:30:00
+  date: 2024-11-07 23:00:00
diff --git a/environment.yml b/environment.yml
index b7795a767..ca37cdbb0 100644
--- a/environment.yml
+++ b/environment.yml
@@ -3,6 +3,7 @@ channels:
 - conda-forge
 dependencies:
   - python>=3.10,<3.12
+  - matplotlib
   - sphinx>=3.5.4
   - sphinx-argparse
   - sphinxcontrib-bibtex>=2.0.0
diff --git a/setup.py b/setup.py
index 0cd70d434..b4ff0c32b 100644
--- a/setup.py
+++ b/setup.py
@@ -37,6 +37,7 @@
         "microdf_python",
         "numpy>=1.24, <1.25",
         "pandas",
+        "matplotlib",
         "pathlib",
         "policyengine-core>=2.8,<2.9",
         "pytest",