diff --git a/lib/cocoapods-core/gem_version.rb b/lib/cocoapods-core/gem_version.rb
index 2c8acfb8b..8832155a3 100644
--- a/lib/cocoapods-core/gem_version.rb
+++ b/lib/cocoapods-core/gem_version.rb
@@ -2,5 +2,5 @@ module Pod
 
   # The version of the cocoapods-core.
   #
-  CORE_VERSION = '0.20.2' unless defined? Pod::CORE_VERSION
+  CORE_VERSION = '0.21.0.rc1' unless defined? Pod::CORE_VERSION
 end