diff --git a/morte.cabal b/morte.cabal
--- a/morte.cabal
+++ b/morte.cabal
@@ -1,5 +1,5 @@
 Name: morte
-Version: 1.6.3
+Version: 1.6.4
 Cabal-Version: >=1.8.0.2
 Build-Type: Simple
 Tested-With: GHC == 7.6.3, GHC == 7.8.4, GHC == 7.10.2, GHC == 8.0.1
@@ -44,7 +44,7 @@
         http-client-tls      >= 0.2.0    && < 0.4 ,
         microlens            >= 0.2.0.0  && < 0.5 ,
         microlens-mtl        >= 0.1.3.1  && < 0.2 ,
-        pipes                >= 4.0.0    && < 4.2 ,
+        pipes                >= 4.0.0    && < 4.3 ,
         system-filepath      >= 0.3.1    && < 0.5 ,
         system-fileio        >= 0.2.1    && < 0.4 ,
         text                 >= 0.11.1.0 && < 1.3 ,
@@ -89,7 +89,7 @@
     Build-Depends:
         base             >= 4        && < 5   ,
         mtl              >= 2.2      && < 2.3 ,
-        QuickCheck       >= 2.8.1    && < 2.9 ,
+        QuickCheck       >= 2.8.1    && < 2.10,
         system-filepath  >= 0.3.1    && < 0.5 ,
         tasty            >= 0.11     && < 0.12,
         tasty-hunit      >= 0.9      && < 0.10,