diff --git a/30log-clean.lua b/30log-clean.lua
index 1072e76..63a4b4c 100644
--- a/30log-clean.lua
+++ b/30log-clean.lua
@@ -199,7 +199,7 @@ _class = function(name, attr)
 end
 
 class._DESCRIPTION = '30 lines library for object orientation in Lua'
-class._VERSION     = '30log v1.1.0'
+class._VERSION     = '30log v1.2.0'
 class._URL         = 'http://github.com/Yonaba/30log'
 class._LICENSE     = 'MIT LICENSE <http://www.opensource.org/licenses/mit-license.php>'
 
diff --git a/30log-global.lua b/30log-global.lua
index f6b0d5e..649a038 100644
--- a/30log-global.lua
+++ b/30log-global.lua
@@ -26,5 +26,5 @@ _class = function(name, attr) local c = deep_copy(attr); _classes[c] = tostring(
 	c.without = function(self, ...) assert_call_from_class(self, 'without(mixin)'); for _, mixin in ipairs({...}) do
 		assert(self.mixins[mixin] == true, ('Attempted to remove a mixin which is not included in %s'):format(tostring(self))); local classes = self:subclasses(); classes[#classes + 1] = self
 		for _, class in ipairs(classes) do for method_name, method in pairs(mixin) do if type(method) == 'function' then class[method_name] = nil end end end; self.mixins[mixin] = nil end; return self end; return setmetatable(c, baseMt) end
-class._DESCRIPTION = '30 lines library for object orientation in Lua'; class._VERSION = '30log v1.1.0'; class._URL = 'http://github.com/Yonaba/30log'; class._LICENSE = 'MIT LICENSE <http://www.opensource.org/licenses/mit-license.php>'
+class._DESCRIPTION = '30 lines library for object orientation in Lua'; class._VERSION = '30log v1.2.0'; class._URL = 'http://github.com/Yonaba/30log'; class._LICENSE = 'MIT LICENSE <http://www.opensource.org/licenses/mit-license.php>'
 return setmetatable(class,{__call = function(_,...) return _class(...) end })
\ No newline at end of file
diff --git a/30log.lua b/30log.lua
index 20a100a..8afc539 100644
--- a/30log.lua
+++ b/30log.lua
@@ -26,5 +26,5 @@ _class = function(name, attr) local c = deep_copy(attr); _classes[c] = tostring(
 	c.without = function(self, ...) assert_call_from_class(self, 'without(mixin)'); for _, mixin in ipairs({...}) do
 		assert(self.mixins[mixin] == true, ('Attempted to remove a mixin which is not included in %s'):format(tostring(self))); local classes = self:subclasses(); classes[#classes + 1] = self
 		for _, class in ipairs(classes) do for method_name, method in pairs(mixin) do if type(method) == 'function' then class[method_name] = nil end end end; self.mixins[mixin] = nil end; return self end; return setmetatable(c, baseMt) end
-class._DESCRIPTION = '30 lines library for object orientation in Lua'; class._VERSION = '30log v1.1.0'; class._URL = 'http://github.com/Yonaba/30log'; class._LICENSE = 'MIT LICENSE <http://www.opensource.org/licenses/mit-license.php>'
+class._DESCRIPTION = '30 lines library for object orientation in Lua'; class._VERSION = '30log v1.2.0'; class._URL = 'http://github.com/Yonaba/30log'; class._LICENSE = 'MIT LICENSE <http://www.opensource.org/licenses/mit-license.php>'
 return setmetatable(class,{__call = function(_,...) return _class(...) end })
\ No newline at end of file
diff --git a/rockspecs/30log-1.2.0-1.rockspec b/rockspecs/30log-1.2.0-1.rockspec
new file mode 100644
index 0000000..7225f2d
--- /dev/null
+++ b/rockspecs/30log-1.2.0-1.rockspec
@@ -0,0 +1,25 @@
+package = "30log"
+version = "1.2.0-1"
+source = {
+   url = "https://github.com/Yonaba/30log/archive/30log-1.2.0-1.tar.gz",
+   dir = "30log-30log-1.2.0-1"
+}
+description = {
+  summary = "30 lines library for object orientation",
+  detailed = [[
+    30log, in extenso "30 Lines Of Goodness" is a minified library
+    for object-orientation in Lua. It features named (and unnamed) classes,
+    single inheritance and provides basic support for mixins.]],
+  homepage = "http://yonaba.github.io/30log",
+  license = "MIT <http://www.opensource.org/licenses/mit-license.php>"
+}
+dependencies = {"lua >= 5.1, <=5.3"}
+build = {
+  type = "builtin",
+  modules = {
+    ["30log"] = "30log.lua",
+    ["30log-clean"] = "30log-clean.lua",
+    ["30log-global"] = "30log-global.lua",
+    ["30log-singleton"] = "30log-singleton.lua"
+  }
+}
\ No newline at end of file
diff --git a/version_history.md b/version_history.md
index 16076e6..4e1118e 100644
--- a/version_history.md
+++ b/version_history.md
@@ -1,5 +1,8 @@
 #Version history#
 
+##1.2.0 (03/10/2016)
+Added `class:cast()`, changes the class of an instance
+
 ##1.1.0 (09/26/2016)
 ### New features
 * Added `class:subclasses()` returns the list of all classes which extend from `class`
@@ -17,7 +20,7 @@
 * An instance of `class` is considered to be the instance of any superclass of `class`
 * A class is considered to be the subclass of any of its direct superclass's superclasses
 
-##1.0.0 (01/09/2015)
+##1.0.0 (01/09/2015) 
 
 ### New features
 * `require "30log"` now returns a callable table