diff --git a/crates/core/Cargo.toml b/crates/core/Cargo.toml
index 7dec12d..3a54376 100644
--- a/crates/core/Cargo.toml
+++ b/crates/core/Cargo.toml
@@ -5,7 +5,11 @@ edition = "2024"
 
 [dependencies]
 chrono = "0.4.44"
-lettre = { version = "0.11", features = ["smtp-transport", "builder"] }
+lettre = { version = "0.11", default-features = false, features = [
+    "smtp-transport",
+    "builder",
+    "rustls-tls",
+] }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 tera = "1.19"