diff --git a/pyproject.toml b/pyproject.toml
index db4ccfcc3..5d9e60af0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -36,7 +36,7 @@ dependencies = [
 dynamic = ["version", "readme"]
 
 [project.optional-dependencies]
-dev = ["flopy[gen,lint,test,optional,doc]", "tach"]
+dev = ["flopy[codegen,lint,test,optional,doc]", "tach"]
 codegen = [
     "boltons>=1.0",
     "Jinja2>=3.0",