diff --git a/api/Cargo.toml b/api/Cargo.toml
index 2df8f17..687fa0a 100644
--- a/api/Cargo.toml
+++ b/api/Cargo.toml
@@ -21,4 +21,4 @@ base64 = "0.9"
 
 [dev-dependencies]
 serde_test = "1.0"
-serde_yaml = "0.8"
+serde_yaml = "0.9.34"
diff --git a/holding/Cargo.toml b/holding/Cargo.toml
index 25b2300..77e0ef5 100644
--- a/holding/Cargo.toml
+++ b/holding/Cargo.toml
@@ -21,7 +21,7 @@ native-tls = "0.2"
 serde = "1.0"
 serde_derive = "1.0"
 serde_json = "1.0"
-serde_yaml = "0.8"
+serde_yaml = "0.9.34"
 serde_urlencoded = "0.7"
 futures = "0.1.21"
 tokio = "0.1.7"