diff --git a/go.mod b/go.mod
index 95f8c42..5514a51 100644
--- a/go.mod
+++ b/go.mod
@@ -10,7 +10,7 @@ require (
 	github.com/modelcontextprotocol/registry v1.5.0
 	github.com/opencontainers/go-digest v1.0.0
 	github.com/opencontainers/image-spec v1.1.1
-	github.com/sigstore/protobuf-specs v0.5.0
+	github.com/sigstore/protobuf-specs v0.5.1
 	github.com/sigstore/sigstore-go v1.1.4
 	github.com/stretchr/testify v1.11.1
 	github.com/xeipuuv/gojsonschema v1.2.0
diff --git a/go.sum b/go.sum
index 1460de7..6673e80 100644
--- a/go.sum
+++ b/go.sum
@@ -289,8 +289,8 @@ github.com/sergi/go-diff v1.3.1 h1:xkr+Oxo4BOQKmkn/B9eMK0g5Kg/983T9DqqPHwYqD+8=
 github.com/sergi/go-diff v1.3.1/go.mod h1:aMJSSKb2lpPvRNec0+w3fl7LP9IOFzdc9Pa4NFbPK1I=
 github.com/shibumi/go-pathspec v1.3.0 h1:QUyMZhFo0Md5B8zV8x2tesohbb5kfbpTi9rBnKh5dkI=
 github.com/shibumi/go-pathspec v1.3.0/go.mod h1:Xutfslp817l2I1cZvgcfeMQJG5QnU2lh5tVaaMCl3jE=
-github.com/sigstore/protobuf-specs v0.5.0 h1:F8YTI65xOHw70NrvPwJ5PhAzsvTnuJMGLkA4FIkofAY=
-github.com/sigstore/protobuf-specs v0.5.0/go.mod h1:+gXR+38nIa2oEupqDdzg4qSBT0Os+sP7oYv6alWewWc=
+github.com/sigstore/protobuf-specs v0.5.1 h1:/5OPaNuolRJmQfeZLayJGFXMpsRJEdgC6ah1/+7Px7U=
+github.com/sigstore/protobuf-specs v0.5.1/go.mod h1:DRBzpFuE+LnvQMN10/dU6nBeKwVLGEQ6o2FovN2Rats=
 github.com/sigstore/rekor v1.5.0 h1:rL7SghHd5HLCtsCrxw0yQg+NczGvM75EjSPPWuGjaiQ=
 github.com/sigstore/rekor v1.5.0/go.mod h1:D7JoVCUkxwQOpPDNYeu+CE8zeBC18Y5uDo6tF8s2rcQ=
 github.com/sigstore/rekor-tiles/v2 v2.0.1 h1:1Wfz15oSRNGF5Dzb0lWn5W8+lfO50ork4PGIfEKjZeo=