diff --git a/README b/README
index 309c4cf1..4244151e 100644
--- a/README
+++ b/README
@@ -39,8 +39,8 @@ OS X prerequisites
 
 - XCode 4.1
 - Sparkle (http://sparkle.andymatuschak.org/)
-- PyObjC 2.3 (http://pyobjc.sourceforge.net/)
-- pluginbuilder 1.0.1 (http://bitbucket.org/hsoft/pluginbuilder)
+- objp 1.1.0 (http://bitbucket.org/hsoft/objp)
+- pluginbuilder 1.1.0 (http://bitbucket.org/hsoft/pluginbuilder)
 - appscript 1.0.0 for ME and PE (http://appscript.sourceforge.net/)
 
 Windows prerequisites
diff --git a/requirements-osx.txt b/requirements-osx.txt
index 8e84104c..71a4dd32 100644
--- a/requirements-osx.txt
+++ b/requirements-osx.txt
@@ -1,5 +1,4 @@
 -r requirements.txt
-pyobjc-core>=2.3
-pluginbuilder>=1.0.0
+objp>=1.0.0
+pluginbuilder>=1.1.0
 appscript>=1.0.0
-objp>=0.1.0
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