diff --git a/pyproject.toml b/pyproject.toml
index 943b5ac..a44f334 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -80,7 +80,7 @@ dev = [
   "pytest>=9.0.3,<10",
   "pytest-cov>=5,<8",
   "ruff>=0.8,<1",
-  "sigstore>=3,<5",
+  "sigstore>=4.2.0,<5",
   "twine>=5,<7",
 ]