diff --git a/src/vault-api/Controller.ts b/src/vault-api/Controller.ts
index 0c08092..cc33898 100644
--- a/src/vault-api/Controller.ts
+++ b/src/vault-api/Controller.ts
@@ -295,6 +295,7 @@ class Controller {
                 this.#client.config.vaultID}`,
             headers: {
               Authorization: `Bearer ${res}`,
+              'content-type': 'application/json',
             },
           })
           .then((response: any) => {