diff --git a/Package.swift b/Package.swift
index d2343ab..56fe157 100644
--- a/Package.swift
+++ b/Package.swift
@@ -23,7 +23,7 @@ let package = Package(
     ],
     dependencies: [
         .package(url: "https://github.com/awslabs/aws-sdk-swift", from: "1.0.2"),
-        .package(url: "https://github.com/fumito-ito/FunctionCalling", from: "0.3.0")
+        .package(url: "https://github.com/fumito-ito/FunctionCalling", from: "0.4.0")
     ],
     targets: [
         // Targets are the basic building blocks of a package, defining a module or a test suite.