diff --git a/pyproject.toml b/pyproject.toml
index db0ad394..c1cc890b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ dependencies = [
 [project.optional-dependencies]
 deprecated-verify = [
     "sigstore<2",
-    "securesystemslib<1",
+    "securesystemslib<2",
     "setuptools>=60.0.0",
 ]