diff --git a/Cargo.lock b/Cargo.lock
index bbc8288..a6ccdef 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -669,7 +669,7 @@ dependencies = [
 [[package]]
 name = "k2v-client"
 version = "0.1.0"
-source = "git+https://git.deuxfleurs.fr/Deuxfleurs/garage.git?branch=improve-k2v-client#a73f174ada005f71a77f12e185da154aa5c254a9"
+source = "git+https://git.deuxfleurs.fr/Deuxfleurs/garage.git?branch=main#9f303f6308a313c8310c3597ecb6828e46352821"
 dependencies = [
  "base64",
  "http",
diff --git a/Cargo.toml b/Cargo.toml
index 0fabd23..df484d9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -31,5 +31,9 @@ tokio = "1.17.0"
 toml = "0.5"
 zstd = { version = "0.9", default-features = false }
 
-k2v-client = { git = "https://git.deuxfleurs.fr/Deuxfleurs/garage.git", branch = "improve-k2v-client" }
+k2v-client = { git = "https://git.deuxfleurs.fr/Deuxfleurs/garage.git", branch = "main" }
 #k2v-client = { path = "../garage/src/k2v-client" }
+
+[[bin]]
+name = "test"
+path = "src/test.rs"
diff --git a/src/config.rs b/src/config.rs
index b77288b..6c3801c 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -3,9 +3,9 @@ use std::io::Read;
 use std::path::PathBuf;
 
 use anyhow::Result;
-use serde::Deserialize;
+use serde::{Serialize,Deserialize};
 
-#[derive(Deserialize, Debug, Clone)]
+#[derive(Serialize, Deserialize, Debug, Clone)]
 pub struct Config {
     pub s3_endpoint: String,
     pub k2v_endpoint: String,
@@ -15,13 +15,13 @@ pub struct Config {
     pub login_ldap: Option<LoginLdapConfig>,
 }
 
-#[derive(Deserialize, Debug, Clone)]
+#[derive(Serialize, Deserialize, Debug, Clone)]
 pub struct LoginStaticConfig {
     pub default_bucket: Option<String>,
     pub users: HashMap<String, LoginStaticUser>,
 }
 
-#[derive(Deserialize, Debug, Clone)]
+#[derive(Serialize, Deserialize, Debug, Clone)]
 pub struct LoginStaticUser {
     pub password: String,
 
@@ -37,7 +37,7 @@ pub struct LoginStaticUser {
     pub secret_key: Option<String>,
 }
 
-#[derive(Deserialize, Debug, Clone)]
+#[derive(Serialize, Deserialize, Debug, Clone)]
 pub struct LoginLdapConfig {
     pub ldap_server: String,
 
diff --git a/src/test.rs b/src/test.rs
new file mode 100644
index 0000000..4d32a6f
--- /dev/null
+++ b/src/test.rs
@@ -0,0 +1,31 @@
+mod config; 
+
+use serde::Serialize;
+use std::collections::HashMap;
+
+fn main() {
+  let config = config::Config {
+    s3_endpoint: "http://127.0.0.1:3900".to_string(),
+    k2v_endpoint: "http://127.0.0.1:3904".to_string(),
+    aws_region: "garage".to_string(),
+    login_static: Some(config::LoginStaticConfig {
+      default_bucket: Some("mailrage".to_string()),
+      users: HashMap::from([
+        ("quentin".to_string(), config::LoginStaticUser {
+          password: "toto".to_string(),
+          aws_access_key_id: "GKxxx".to_string(),
+          aws_secret_access_key: "ffff".to_string(),
+          bucket: Some("mailrage-quentin".to_string()),
+          user_secret: "xxx".to_string(),
+          alternate_user_secrets: vec![],
+          master_key: None,
+          secret_key: None,
+        }),
+      ]),
+    }),
+    login_ldap: None,
+  };
+
+  let ser = toml::to_string(&config).unwrap();
+  println!("{}", ser);
+}