diff --git a/SwiftCSVExport.podspec b/SwiftCSVExport.podspec
index fa9192d..d08b62f 100644
--- a/SwiftCSVExport.podspec
+++ b/SwiftCSVExport.podspec
@@ -69,6 +69,7 @@ Pod::Spec.new do |s|
   #  When using multiple platforms
   s.ios.deployment_target = "8.0"
   s.osx.deployment_target = "10.9"
+  s.swift_version = '4.0'
   # s.watchos.deployment_target = "2.0"
   # s.tvos.deployment_target = "9.0"