diff --git a/env/rustmailer.env b/env/rustmailer.env
index c5caccd..5f79424 100644
--- a/env/rustmailer.env
+++ b/env/rustmailer.env
@@ -28,7 +28,7 @@ BICHON_ROOT_DIR=/data/bichon-data
 # Enable API access token validation
 BICHON_ENABLE_ACCESS_TOKEN=false
 
-# IP address to bind the HTTP and gRPC servers to (default: 0.0.0.0)
+# IP address to bind the HTTP and gRPC servers to (default: ::)
 BICHON_BIND_IP=
 
 # Comma-separated list of allowed CORS origins (e.g. https://app.example.com)
diff --git a/src/modules/rest/mod.rs b/src/modules/rest/mod.rs
index 541ff3d..d7d0014 100644
--- a/src/modules/rest/mod.rs
+++ b/src/modules/rest/mod.rs
@@ -51,7 +51,7 @@ pub type ApiResult<T, E = ApiErrorResponse> = std::result::Result<T, E>;
 
 pub async fn start_http_server() -> BichonResult<()> {
     let listener = TcpListener::bind((
-        SETTINGS.bichon_bind_ip.clone().unwrap_or("0.0.0.0".into()),
+        SETTINGS.bichon_bind_ip.clone().unwrap_or("::".into()),
         SETTINGS.bichon_http_port as u16,
     ));
 
diff --git a/src/modules/settings/cli.rs b/src/modules/settings/cli.rs
index fbc58f7..822c814 100644
--- a/src/modules/settings/cli.rs
+++ b/src/modules/settings/cli.rs
@@ -46,16 +46,16 @@ pub struct Settings {
     )]
     pub bichon_http_port: i32,
 
-    /// The IP address that the node binds to, in IPv4 format (e.g., 192.168.1.1).
+    /// The IP address that the node binds to, in IPv4 or IPv6 format (e.g., 192.168.1.1 or ::1).
     #[clap(
         long,
         env,
-        default_value = "0.0.0.0",
-        help = "The IP address that the node binds to, in IPv4 format (e.g., 192.168.1.1). Required in cluster mode.",
+        default_value = "::",
+        help = "The IP address that the node binds to, in IPv4 or IPv6 format (e.g., 192.168.1.1 or ::1). Required in cluster mode.",
         value_parser = ValueParser::new(|s: &str| {
-            // Ensure the input is a valid IPv4 address
-            if s.parse::<std::net::Ipv4Addr>().is_err() {
-                return Err("The bind IP address must be a valid IPv4 address.".to_string());
+            // Ensure the input is a valid IPv4 or IPv6 address
+            if s.parse::<std::net::Ipv4Addr>().is_err() && s.parse::<std::net::Ipv6Addr>().is_err() {
+                return Err("The bind IP address must be a valid IPv4 or IPv6 address.".to_string());
             }
 
             // If the address is valid, return it