diff --git a/calendar-recycling.cabal b/calendar-recycling.cabal
--- a/calendar-recycling.cabal
+++ b/calendar-recycling.cabal
@@ -1,5 +1,5 @@
 Name:                calendar-recycling
-Version:             0.0
+Version:             0.0.0.1
 Synopsis:            List years with the same calendars
 Description:
   Generate a partial HTML document grouping years
@@ -17,7 +17,7 @@
 Cabal-Version:       >=1.10
 
 Source-Repository this
-  Tag:         0.0
+  Tag:         0.0.0.1
   Type:        darcs
   Location:    http://hub.darcs.net/thielema/calendar-recycling
 
@@ -30,7 +30,7 @@
   Build-Depends:
     html >=1.0 && <1.1,
     old-time >=1.0 && <1.2,
-    containers >=0.1 && <0.6,
+    containers >=0.1 && <0.7,
     utility-ht >=0.0.11 && <0.1,
     base >=4.5 && <5
   Hs-Source-Dirs:      src