diff --git a/hcron.cabal b/hcron.cabal
--- a/hcron.cabal
+++ b/hcron.cabal
@@ -1,5 +1,5 @@
 Name:                hcron
-Version:             0.0.0.2
+Version:             0.0.0.3
 License:             BSD3
 License-file:        LICENSE
 Author:              Timo B. Kranz
@@ -23,17 +23,17 @@
 
 Library
   Build-Depends: 
-        base           == 4.*,
+        base           >= 4      && < 5,
         containers     >= 0.4    && <  0.5,
-        time           >= 1.1    && <= 1.3,
+        time           >= 1.1    && <= 1.4,
         directory      >= 1.0    && <= 1.2,
         mtl            >= 2.0    && <  3.0,
-        old-locale     == 1.0.*,
-        process        == 1.0.*,
-        random         == 1.0.*,
-        pretty         == 1.0.*,
-        bytestring     == 0.9.*,
-        stm            == 2.2.*
+        old-locale     >= 1.0    && <  1.1,
+        process        >= 1.0    && <  1.2,
+        random         >= 1.0    && <  1.1,
+        pretty         >= 1.0    && <  1.2,
+        bytestring     >= 0.9    && <  1.0,
+        stm            >= 2.2    && <  2.3
 
   ghc-options:
         -Wall