diff --git a/pyproject.toml b/pyproject.toml
index 372b29373..3fe4b1d19 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,7 +21,6 @@ dynamic = [
 dependencies = [
   "asdf-standard>=1.1.0",
   "asdf-transform-schemas>=0.3",
-  "asdf-unit-schemas>=0.1",
   "importlib-metadata>=4.11.4",
   "jmespath>=0.6.2",
   "numpy>=1.22",