diff --git a/ext/common/Constants.h b/ext/common/Constants.h
index 30318356e3..edcaf92d76 100644
--- a/ext/common/Constants.h
+++ b/ext/common/Constants.h
@@ -72,7 +72,7 @@
 
 	#define MESSAGE_SERVER_MAX_USERNAME_SIZE 100
 
-	#define PASSENGER_VERSION "4.0.18"
+	#define PASSENGER_VERSION "4.0.19"
 
 	#define POOL_HELPER_THREAD_STACK_SIZE 262144
 
diff --git a/lib/phusion_passenger.rb b/lib/phusion_passenger.rb
index d93c42f2e6..1f2f47a5bc 100644
--- a/lib/phusion_passenger.rb
+++ b/lib/phusion_passenger.rb
@@ -30,7 +30,7 @@ module PhusionPassenger
 	
 	PACKAGE_NAME = 'passenger'
 	# Run 'rake ext/common/Constants.h' after changing this number.
-	VERSION_STRING = '4.0.18'
+	VERSION_STRING = '4.0.19'
 	
 	PREFERRED_NGINX_VERSION = '1.4.2'
 	NGINX_SHA256_CHECKSUM = '5361ffb7b0ebf8b1a04369bc3d1295eaed091680c1c58115f88d56c8e51f3611'