diff --git a/package.json b/package.json
index c7ec261..e81a1f1 100644
--- a/package.json
+++ b/package.json
@@ -92,7 +92,6 @@
   "engines": {
     "node": ">= 16.0.0"
   },
-  "packageManager": "^yarn@1.22.15",
   "jest": {
     "preset": "react-native",
     "modulePathIgnorePatterns": [
diff --git a/rust/src/lib.rs b/rust/src/lib.rs
index b628235..da9ef11 100644
--- a/rust/src/lib.rs
+++ b/rust/src/lib.rs
@@ -335,7 +335,7 @@ fn opaque_start_client_registration(
 fn get_optional_string(ident: Vec<String>) -> Result<Option<String>, Error> {
     match ident.len() {
         0 => Ok(None),
-        1 => ident.get(0).map_or_else(
+        1 => ident.first().map_or_else(
             || {
                 Err(Error::Input {
                     message: "error getting value at index 0".to_string(),