diff --git a/pixi.lock b/pixi.lock
index b59d11c2..c3efa9aa 100644
--- a/pixi.lock
+++ b/pixi.lock
@@ -5318,7 +5318,7 @@ packages:
 - pypi: ./
   name: flopy4
   version: 0.0.1.dev0
-  sha256: 32b41595aa9f3fae738e08c28b3d43c8e4c0a1f1905e2a7cee76feff0872de71
+  sha256: e2bd4bc603e77ab202708920decb6d1ba9ac82b48b6f8f9229fed27374e1ed3f
   requires_dist:
   - modflow-devtools[dfn] @ git+https://github.com/MODFLOW-ORG/modflow-devtools.git@dfn
   - xattree @ git+https://github.com/wpbonelli/xattree.git
diff --git a/pyproject.toml b/pyproject.toml
index 6be2f721..c214ce0e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -88,6 +88,10 @@ include = ["flopy4", "flopy4.*"]
 [tool.setuptools.package-data]
 "flopy4.dfns" = ["dfns/*.dfn"]
 "flopy4.toml" = ["dfns/toml/*.toml"]
+"flopy4" = [
+    "mf6/codec/**/*.lark",
+    "mf6/codec/**/*.jinja",
+]
 
 [tool.ruff]
 line-length = 100