diff --git a/Gemfile.lock b/Gemfile.lock
index c1c8f08..ca2e7d0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    rscons (1.8.1)
+    rscons (1.9.0)
       json (~> 1.0)
 
 GEM
diff --git a/lib/rscons/version.rb b/lib/rscons/version.rb
index 2004746..4b57ed5 100644
--- a/lib/rscons/version.rb
+++ b/lib/rscons/version.rb
@@ -1,4 +1,4 @@
 module Rscons
   # gem version
-  VERSION = "1.8.1"
+  VERSION = "1.9.0"
 end