diff --git a/GoogleMulticastAppDelegate.podspec b/GoogleMulticastAppDelegate.podspec
index 2481907..e698a2e 100644
--- a/GoogleMulticastAppDelegate.podspec
+++ b/GoogleMulticastAppDelegate.podspec
@@ -27,6 +27,8 @@ Pod::Spec.new do |s|
   # s.tvos.deployment_target = tvos_deployment_target
   # s.watchos.deployment_target = watchos_deployment_target
 
+  s.swift_versions = ['5.0', '5.2']
+
   s.cocoapods_version = '>= 1.4.0'
   s.prefix_header_file = false