diff --git a/common/Cargo.toml b/common/Cargo.toml
index 8034968..c7a70fe 100644
--- a/common/Cargo.toml
+++ b/common/Cargo.toml
@@ -4,4 +4,6 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
+chrono = { version = "0.4.41", features = ["serde"] }
 serde = { version = "1.0.219", features = ["derive"] }
+serde_json = "1.0.140"
diff --git a/common/src/lib.rs b/common/src/lib.rs
index e144883..c2df196 100644
--- a/common/src/lib.rs
+++ b/common/src/lib.rs
@@ -1 +1,2 @@
 pub mod metrics;
+pub mod mqtt;