diff --git a/pyproject.toml b/pyproject.toml
index 4bfe92b2..b1231609 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,7 +23,7 @@ dependencies = [
   # Some of these schema dependencies are minimums because we generated asdf
   # files with them unpinned so they are now required to read generated asdf
   # files.
-  "asdf>=2.15.0",
+  "asdf>=3.3.0",  # Required by gwcs 0.24
   "asdf-astropy>=0.4.0",
   "asdf-coordinates-schemas>=0.2.0",
   "asdf-standard>=1.1.0",