diff --git a/Cargo.toml b/Cargo.toml
index a8d11fe..3e15fde 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,5 +1,6 @@
 [workspace]
+resolver = "2"
 members = [
     "demo-server",
     "jwt-authorizer",
-]
\ No newline at end of file
+]
diff --git a/jwt-authorizer/src/validation.rs b/jwt-authorizer/src/validation.rs
index f609efb..8f0fb43 100644
--- a/jwt-authorizer/src/validation.rs
+++ b/jwt-authorizer/src/validation.rs
@@ -91,8 +91,8 @@ impl Validation {
             HashSet::with_capacity(0)
         };
 
-        let aud = self.aud.clone().map(|v| HashSet::from_iter(v.into_iter()));
-        let iss = self.iss.clone().map(|v| HashSet::from_iter(v.into_iter()));
+        let aud = self.aud.clone().map(HashSet::from_iter);
+        let iss = self.iss.clone().map(HashSet::from_iter);
 
         let mut jwt_validation = jsonwebtoken::Validation::default();