diff --git a/pyproject.toml b/pyproject.toml
index 7d5be9d..d22bcfb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -30,7 +30,7 @@ classifiers = [
 
 dependencies = [
     "mcp[cli]>=2,<3",
-    "pyyaml>=6.0",
+    "pyyaml>=6.0.3",
     "pydantic>=2.0",
     "pynacl>=1.5.0",
     "python-frontmatter>=1.0.0",