diff --git a/orc.cabal b/orc.cabal
--- a/orc.cabal
+++ b/orc.cabal
@@ -1,5 +1,5 @@
 name:               orc
-version:            1.2.1.1
+version:            1.2.1.2
 synopsis:           Orchestration-style co-ordination EDSL
 description:        Provides an EDSL with Orc primitives.
 category:           Web
@@ -14,12 +14,12 @@
 
 Library
   Extensions:       GeneralizedNewtypeDeriving
-  Build-Depends:    base    >= 4.2.0.0  && <= 5.0,
-                    stm     >= 2.2.0.0  && <= 2.3,
-                    process >= 1.0.1.0  && <= 1.1,
-                    mtl     >= 2.0.1.0  && <= 2.1,
-                    monadIO >= 0.10.1.1 && <= 0.11,
-                    deepseq >= 1.1.0.0  && <= 1.2
+  Build-Depends:    base    >= 4.2.0.0  && < 5.0,
+                    stm     >= 2.2.0.0  && < 2.5,
+                    process >= 1.0.1.0  && < 1.2,
+                    mtl     >= 2.0.1.0  && < 2.1,
+                    monadIO >= 0.10.1.1 && < 0.11,
+                    deepseq >= 1.1.0.0  && < 1.4
   Exposed-modules:  Control.Concurrent.Hierarchical
                     Orc.Monad
                     Orc.Combinators