diff --git a/src/core/libs/cardano_multiplatform_lib/cardano_multiplatform_lib.generated.js b/src/core/libs/cardano_multiplatform_lib/cardano_multiplatform_lib.generated.js
index 76c1fce7..8c437c0c 100644
--- a/src/core/libs/cardano_multiplatform_lib/cardano_multiplatform_lib.generated.js
+++ b/src/core/libs/cardano_multiplatform_lib/cardano_multiplatform_lib.generated.js
@@ -1,7 +1,7 @@
 // @generated file from wasmbuild -- do not edit
 // deno-lint-ignore-file
 // deno-fmt-ignore-file
-// source-hash: 48fbf1656de3bcfc28fa6ea7700367cc6649f4dd
+// source-hash: 1ebe808cb0e2e28c65872aec3d912c4612694ba4
 let wasm;
 
 const cachedTextDecoder = new TextDecoder("utf-8", {
diff --git a/src/core/libs/cardano_multiplatform_lib/cardano_multiplatform_lib_bg.wasm b/src/core/libs/cardano_multiplatform_lib/cardano_multiplatform_lib_bg.wasm
index 99890e29..1b2ea743 100644
Binary files a/src/core/libs/cardano_multiplatform_lib/cardano_multiplatform_lib_bg.wasm and b/src/core/libs/cardano_multiplatform_lib/cardano_multiplatform_lib_bg.wasm differ
diff --git a/src/core/libs/cardano_multiplatform_lib/nodejs/cardano_multiplatform_lib.generated.js b/src/core/libs/cardano_multiplatform_lib/nodejs/cardano_multiplatform_lib.generated.js
index 9733e775..27b17ba2 100644
--- a/src/core/libs/cardano_multiplatform_lib/nodejs/cardano_multiplatform_lib.generated.js
+++ b/src/core/libs/cardano_multiplatform_lib/nodejs/cardano_multiplatform_lib.generated.js
@@ -1,7 +1,7 @@
 // @generated file from wasmbuild -- do not edit
 // deno-lint-ignore-file
 // deno-fmt-ignore-file
-// source-hash: 48fbf1656de3bcfc28fa6ea7700367cc6649f4dd
+// source-hash: 1ebe808cb0e2e28c65872aec3d912c4612694ba4
 
 let imports = {};
 imports["__wbindgen_placeholder__"] = module.exports;
diff --git a/src/core/libs/cardano_multiplatform_lib/src/tx_builder_utils.rs b/src/core/libs/cardano_multiplatform_lib/src/tx_builder_utils.rs
index e66ded47..88d6b0b5 100644
--- a/src/core/libs/cardano_multiplatform_lib/src/tx_builder_utils.rs
+++ b/src/core/libs/cardano_multiplatform_lib/src/tx_builder_utils.rs
@@ -285,7 +285,7 @@ pub async fn get_ex_units_maestro(tx: Transaction, ms: &Maestro) -> Result<Redee
 
     let request = Request::new_with_str_and_init(&url, &opts)?;
     request.headers().set("Content-Type", "application/json")?;
-    request.headers().set("api_key", &ms.api_key)?;
+    request.headers().set("api-key", &ms.api_key)?;
 
     let window = js_sys::global().unchecked_into::<globalThis>();
     let resp_value = JsFuture::from(window.fetch_with_request(&request)).await?;