diff --git a/pyproject.toml b/pyproject.toml
index 9a536ca9..da614bcf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -36,7 +36,8 @@ dependencies = [
   "rich ~= 13.0",
   "securesystemslib",
   "sigstore-protobuf-specs ~= 0.2.2",
-  "sigstore-rekor-types >= 0.0.11",
+  # NOTE(ww): Under active development, so strictly pinned.
+  "sigstore-rekor-types == 0.0.11",
   "tuf >= 2.1,< 4.0",
 ]
 requires-python = ">=3.8"