diff --git a/crates/dtmm/src/controller/game.rs b/crates/dtmm/src/controller/game.rs
index fa359de..cbb1b02 100644
--- a/crates/dtmm/src/controller/game.rs
+++ b/crates/dtmm/src/controller/game.rs
@@ -35,6 +35,7 @@ const DEPLOYMENT_DATA_PATH: &str = "dtmm-deployment.sjson";
 #[derive(Serialize, Deserialize)]
 struct DeploymentData {
     bundles: Vec<String>,
+    #[serde(with = "time::serde::iso8601")]
     timestamp: OffsetDateTime,
 }
 
diff --git a/lib/serde_sjson b/lib/serde_sjson
index e94218d..81213f7 160000
--- a/lib/serde_sjson
+++ b/lib/serde_sjson
@@ -1 +1 @@
-Subproject commit e94218d8f52a51529c83af33a99cc17f66caae2e
+Subproject commit 81213f792767ddf1e7be60b066c87f7b137ca0a7