diff --git a/libzmq.rb b/libzmq.rb
index 5d50af6..28ea829 100755
--- a/libzmq.rb
+++ b/libzmq.rb
@@ -8,7 +8,7 @@
 require 'fileutils'
 
 # ZeroMQ release version
-PKG_VER="4.2.5"
+PKG_VER="4.3.4"
 
 # Minimum platform versions
 IOS_VERSION_MIN         = "9.0"