diff --git a/nwb_linkml/pyproject.toml b/nwb_linkml/pyproject.toml
index 4b7df02..4f111e1 100644
--- a/nwb_linkml/pyproject.toml
+++ b/nwb_linkml/pyproject.toml
@@ -31,7 +31,6 @@ pytest-cov = {version = "^4.1.0", optional = true}
 coveralls = {version = "^3.3.1", optional = true}
 
 [tool.poetry.extras]
-dev = ["nwb_schema_language"]
 tests = [
     "pytest",       "pytest-depends", "coverage", "pytest-md",
     "pytest-emoji", "pytest-cov",     "coveralls"