diff --git a/pyproject.toml b/pyproject.toml
index fbd816d..a06e8ff 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,7 +27,7 @@ dependencies = [
     "rich>=14,<16",
     # Lane D W8 ? .forge sidecar parser (a1.sidecar_parser) and the
     # GitHub Action validator test surface both depend on PyYAML.
-    "pyyaml>=6,<7",
+    "pyyaml>=6.0.3,<7",
 ]
 
 [project.optional-dependencies]