diff --git a/Zip.podspec b/Zip.podspec
index 101b77a3ae8453f6d9e4461a75f2c97bc5324d50..6017a4cc5fbc492a5549d240b927877eedfceec8 100644
--- a/Zip.podspec
+++ b/Zip.podspec
@@ -10,6 +10,7 @@ Pod::Spec.new do |s|
   s.name             = "Zip"
   s.version          = "1.1.0"
   s.summary          = "Zip and unzip files in Swift."
+  s.swift_version    = "4.1"
 
 # This description is used to generate tags and improve search results.
 #   * Think: What does it do? Why did you write it? What is the focus?