diff --git a/etc/environment.yml b/etc/environment.yml
index 25cee3eda..561bd85ee 100644
--- a/etc/environment.yml
+++ b/etc/environment.yml
@@ -10,6 +10,13 @@ dependencies:
   - matplotlib>=1.4.0
   - pandas>=2.0.0
 
+  # codegen
+  - boltons>=1.0
+  - Jinja2>=3.0
+  - pip:
+      - git+https://github.com/MODFLOW-USGS/modflow-devtools.git
+  - tomlkit
+
   # lint
   - cffconvert
   - ruff
@@ -21,8 +28,6 @@ dependencies:
   - jupyter
   - jupyter_client>=8.4.0
   - jupytext
-  - pip:
-      - git+https://github.com/MODFLOW-USGS/modflow-devtools.git
   - pytest!=8.1.0
   - pytest-benchmark
   - pytest-cov