diff --git a/Cargo.toml b/Cargo.toml
index d0646250..9a96dff7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,5 +15,5 @@ version = "0.4.2"
 [dependencies]
 base64 = "0.10.1"
 ring = "0.14.6"
-serde_json = "1.0.39"
+serde_json = "1.0.40"
 untrusted = "0.6.2"