diff --git a/DropDown.podspec b/DropDown.podspec
index 8b39002..5e6467b 100644
--- a/DropDown.podspec
+++ b/DropDown.podspec
@@ -26,4 +26,5 @@ Pod::Spec.new do |s|
   s.resources = "DropDown/resources/*.{png,xib}"
   s.requires_arc = true
 
+  s.swift_version = '4.2'
 end