diff --git a/front_matter/Cargo.toml b/front_matter/Cargo.toml
index 4337313e7..6528ec48d 100644
--- a/front_matter/Cargo.toml
+++ b/front_matter/Cargo.toml
@@ -9,4 +9,4 @@ serde = { version = "=1.0.219", features = ["derive"] }
 toml = "=0.8.20"
 
 [dev-dependencies]
-walkdir = "2.5.0"
+walkdir = "=2.5.0"