diff --git a/Sources/VRCKit/Services/AuthenticationService.swift b/Sources/VRCKit/Services/AuthenticationService.swift
index 93f94da..6d2a2c0 100644
--- a/Sources/VRCKit/Services/AuthenticationService.swift
+++ b/Sources/VRCKit/Services/AuthenticationService.swift
@@ -20,7 +20,7 @@ public final actor AuthenticationService: APIService, AuthenticationServiceProto
         let path = "\(authPath)/exists"
         let queryItems = [URLQueryItem(name: "username", value: userId.description)]
         let response = try await client.request(path: path, method: .get, queryItems: queryItems)
-        let result: ExistsResponse = try await Serializer.shared.decode(response.data)
+        let result: ExistsResponse = try Serializer.shared.decode(response.data)
         return result.userExists
     }
 
@@ -30,10 +30,10 @@ public final actor AuthenticationService: APIService, AuthenticationServiceProto
         let path = "\(authPath)/user"
         let response = try await client.request(path: path, method: .get, basic: true)
         do {
-            let user: User = try await Serializer.shared.decode(response.data)
+            let user: User = try Serializer.shared.decode(response.data)
             return .left(user)
         } catch _ as DecodingError {
-            let result: RequiresTwoFactorAuthResponse = try await Serializer.shared.decode(response.data)
+            let result: RequiresTwoFactorAuthResponse = try Serializer.shared.decode(response.data)
             guard let requires = result.requires else {
                 throw VRCKitError.unexpected
             }
@@ -49,13 +49,13 @@ public final actor AuthenticationService: APIService, AuthenticationServiceProto
     public func verify2FA(verifyType: VerifyType, code: String) async throws -> Bool {
         guard code.count == 6 else { throw VRCKitError.invalidRequest("Code must be 6 digits") }
         let path = "\(authPath)/twofactorauth/\(verifyType.rawValue.lowercased())/verify"
-        let requestData = try await Serializer.shared.encode(VerifyRequest(code: code))
+        let requestData = try Serializer.shared.encode(VerifyRequest(code: code))
         let response = try await client.request(
             path: path,
             method: .post,
             body: requestData
         )
-        let result: VerifyResponse = try await Serializer.shared.decode(response.data)
+        let result: VerifyResponse = try Serializer.shared.decode(response.data)
         return result.verified
     }
 
@@ -63,7 +63,7 @@ public final actor AuthenticationService: APIService, AuthenticationServiceProto
     /// - Returns: A boolean indicating if the token is valid.
     public func verifyAuthToken() async throws -> Bool {
         let response = try await client.request(path: authPath, method: .get)
-        let result: VerifyAuthTokenResponse = try await Serializer.shared.decode(response.data)
+        let result: VerifyAuthTokenResponse = try Serializer.shared.decode(response.data)
         return result.ok
     }
 
diff --git a/Sources/VRCKit/Services/FavoriteService.swift b/Sources/VRCKit/Services/FavoriteService.swift
index 3818eed..13dbe5b 100644
--- a/Sources/VRCKit/Services/FavoriteService.swift
+++ b/Sources/VRCKit/Services/FavoriteService.swift
@@ -19,7 +19,7 @@ public final actor FavoriteService: APIService, FavoriteServiceProtocol {
     public func listFavoriteGroups() async throws -> [FavoriteGroup] {
         let path = "favorite/groups"
         let response = try await client.request(path: path, method: .get)
-        return try await Serializer.shared.decode(response.data)
+        return try Serializer.shared.decode(response.data)
     }
 
     /// Lists a user's all favorites with the specified parameters.
@@ -63,7 +63,7 @@ public final actor FavoriteService: APIService, FavoriteServiceProtocol {
             queryItems.append(URLQueryItem(name: "tag", value: tag.description))
         }
         let response = try await client.request(path: path, method: .get, queryItems: queryItems)
-        return try await Serializer.shared.decode(response.data)
+        return try Serializer.shared.decode(response.data)
     }
 
     /// Fetches details of favorite groups asynchronously.
@@ -100,11 +100,11 @@ public final actor FavoriteService: APIService, FavoriteServiceProtocol {
         tag: String
     ) async throws -> Favorite {
         let path = "favorites"
-        let requestData = try await Serializer.shared.encode(
+        let requestData = try Serializer.shared.encode(
             RequestToAddFavorite(type: type, favoriteId: favoriteId, tags: [tag])
         )
         let response = try await client.request(path: path, method: .post, body: requestData)
-        return try await Serializer.shared.decode(response.data)
+        return try Serializer.shared.decode(response.data)
     }
 
     /// Updates a favorite group with the given parameters, display name, and visibility.
@@ -123,7 +123,7 @@ public final actor FavoriteService: APIService, FavoriteServiceProtocol {
         let pathParams = ["favorite", "group", source.type.rawValue, source.name, source.ownerId]
         let path = pathParams.joined(separator: "/")
         let body = RequestToUpdateFavoriteGroup(displayName: displayName, visibility: visibility)
-        let requestData = try await Serializer.shared.encode(body)
+        let requestData = try Serializer.shared.encode(body)
         _ = try await client.request(path: path, method: .put, body: requestData)
     }
 
@@ -133,6 +133,6 @@ public final actor FavoriteService: APIService, FavoriteServiceProtocol {
     public func removeFavorite(favoriteId: String) async throws -> SuccessResponse {
         let path = "favorites/\(favoriteId)"
         let response = try await client.request(path: path, method: .delete)
-        return try await Serializer.shared.decode(response.data)
+        return try Serializer.shared.decode(response.data)
     }
 }
diff --git a/Sources/VRCKit/Services/FriendService.swift b/Sources/VRCKit/Services/FriendService.swift
index 77444ce..12f0b9d 100644
--- a/Sources/VRCKit/Services/FriendService.swift
+++ b/Sources/VRCKit/Services/FriendService.swift
@@ -21,7 +21,7 @@ public final actor FriendService: APIService, FriendServiceProtocol {
             URLQueryItem(name: "offline", value: offline.description)
         ]
         let response = try await client.request(path: path, method: .get, queryItems: queryItems)
-        return try await Serializer.shared.decode(response.data)
+        return try Serializer.shared.decode(response.data)
     }
 
     /// A helper function that splits a large API request tasks to fetch friend data concurrently,
diff --git a/Sources/VRCKit/Services/InstanceService.swift b/Sources/VRCKit/Services/InstanceService.swift
index 8f07f6b..546db24 100644
--- a/Sources/VRCKit/Services/InstanceService.swift
+++ b/Sources/VRCKit/Services/InstanceService.swift
@@ -23,7 +23,7 @@ public final actor InstanceService: APIService, InstanceServiceProtocol {
             path: "\(path)/\(worldId):\(instanceId)",
             method: .get
         )
-        return try await Serializer.shared.decode(response.data)
+        return try Serializer.shared.decode(response.data)
     }
 
     /// Fetches an instance using the specified location string.
@@ -32,6 +32,6 @@ public final actor InstanceService: APIService, InstanceServiceProtocol {
     /// - Throws: An error if the request fails or the data cannot be decoded.
     public func fetchInstance(location: String) async throws -> Instance {
         let response = try await client.request(path: "\(path)/\(location)", method: .get)
-        return try await Serializer.shared.decode(response.data)
+        return try Serializer.shared.decode(response.data)
     }
 }
diff --git a/Sources/VRCKit/Services/UserNoteService.swift b/Sources/VRCKit/Services/UserNoteService.swift
index 5923767..2264051 100644
--- a/Sources/VRCKit/Services/UserNoteService.swift
+++ b/Sources/VRCKit/Services/UserNoteService.swift
@@ -24,7 +24,7 @@ public final actor UserNoteService: APIService, UserNoteServiceProtocol {
         let response = try await request(
             userNote: UserNoteRequest(targetUserId: targetUserId, note: note)
         )
-        return try await Serializer.shared.decode(response.data)
+        return try Serializer.shared.decode(response.data)
     }
 
     /// Clears the note for a specific user by sending an empty note to the API.
@@ -37,7 +37,7 @@ public final actor UserNoteService: APIService, UserNoteServiceProtocol {
     /// - Parameter userNote: The `UserNoteRequest` containing the user ID and note content.
     /// - Returns: The `HTTPResponse` received from the API.
     private func request(userNote: UserNoteRequest) async throws -> APIClient.HTTPResponse {
-        let requestData = try await Serializer.shared.encode(userNote)
+        let requestData = try Serializer.shared.encode(userNote)
         return try await client.request(path: path, method: .post, body: requestData)
     }
 }
diff --git a/Sources/VRCKit/Services/UserService.swift b/Sources/VRCKit/Services/UserService.swift
index 6b1c12a..285f442 100644
--- a/Sources/VRCKit/Services/UserService.swift
+++ b/Sources/VRCKit/Services/UserService.swift
@@ -15,12 +15,12 @@ public final actor UserService: APIService, UserServiceProtocol {
     /// Fetch a user
     public func fetchUser(userId: String) async throws -> UserDetail {
         let response = try await client.request(path: "\(path)/\(userId)", method: .get)
-        return try await Serializer.shared.decode(response.data)
+        return try Serializer.shared.decode(response.data)
     }
 
     /// Update user
     public func updateUser(id: String, editedInfo: EditableUserInfo) async throws {
-        let requestData = try await Serializer.shared.encode(editedInfo)
+        let requestData = try Serializer.shared.encode(editedInfo)
         _ = try await client.request(
             path: "\(path)/\(id)",
             method: .put,
diff --git a/Sources/VRCKit/Services/WorldService.swift b/Sources/VRCKit/Services/WorldService.swift
index ebf6bf9..0873078 100644
--- a/Sources/VRCKit/Services/WorldService.swift
+++ b/Sources/VRCKit/Services/WorldService.swift
@@ -18,7 +18,7 @@ public final actor WorldService: APIService, WorldServiceProtocol {
 
     public func fetchWorld(worldId: String) async throws -> World {
         let response = try await client.request(path: "\(path)/\(worldId)", method: .get)
-        return try await Serializer.shared.decode(response.data)
+        return try Serializer.shared.decode(response.data)
     }
 
     public func fetchFavoritedWorlds() async throws -> [FavoriteWorld] {
@@ -44,7 +44,7 @@ public final actor WorldService: APIService, WorldServiceProtocol {
             URLQueryItem(name: "offset", value: offset.description)
         ]
         let response = try await client.request(path: "\(path)/favorites", method: .get, queryItems: queryItems)
-        let favoriteWorldWrapper: SafeDecodingArray<FavoriteWorld> = try await Serializer.shared.decode(response.data)
+        let favoriteWorldWrapper: SafeDecodingArray<FavoriteWorld> = try Serializer.shared.decode(response.data)
         return favoriteWorldWrapper.wrappedValue
     }
 }