diff --git a/Armchair.podspec b/Armchair.podspec
index e0c0f1e..6465853 100644
--- a/Armchair.podspec
+++ b/Armchair.podspec
@@ -28,5 +28,6 @@ Pod::Spec.new do |s|
   s.ios.deployment_target = '8.0'
   s.osx.deployment_target = '10.10'
   s.requires_arc          = true
-  
+  s.swift_version         = '4.2'
+
 end