Prepare for 2.5.3c1.
diff --git a/Lib/idlelib/idlever.py b/Lib/idlelib/idlever.py
index ec8e000..bf76c40 100644
--- a/Lib/idlelib/idlever.py
+++ b/Lib/idlelib/idlever.py
@@ -1 +1 @@
-IDLE_VERSION = "1.2.2"
+IDLE_VERSION = "1.2.3c1"