diff --git a/executables/Tests.hs b/executables/Tests.hs
--- a/executables/Tests.hs
+++ b/executables/Tests.hs
@@ -304,6 +304,30 @@
     fmap (Decoder.timestamp integerDatetimes . fromJust) $ 
       query "SELECT '2000-01-19 10:41:06' :: timestamp" [] PQ.Binary
 
+test_timestamptzOffset =
+  do
+    c <- connect
+    initConnection c
+    PQ.exec c "DROP TABLE IF EXISTS a"
+    PQ.exec c "CREATE TABLE a (b TIMESTAMPTZ)"
+    PQ.exec c "set timezone to 'America/Los_Angeles'"
+    let p = (,,) (PQ.Oid $ fromIntegral o) 
+                 (Encoder.timestamptz integerDatetimes x) 
+                 (PQ.Binary)
+        o = PTI.oidOf PTI.timestamptz
+        x = read "2011-09-28 00:17:25"
+    PQ.execParams c "insert into a (b) values ($1)" [Just p] PQ.Text
+    PQ.exec c "set timezone to 'Europe/Stockholm'"
+    assertEqual (Just "2011-09-28 02:17:25+02") 
+      =<< singleResult 
+      =<< PQ.execParams c "SELECT * FROM a" [] PQ.Text
+    assertEqual (Just (Right x)) 
+      =<< return . fmap (Decoder.timestamptz integerDatetimes)
+      =<< singleResult 
+      =<< PQ.execParams c "SELECT * FROM a" [] PQ.Binary
+  where
+    singleResult r = PQ.getvalue (fromJust r) 0 0
+
 prop_timestamptz =
   forAll microsUTCTimeGen $ \x ->
     Just (Right (timestamptzApxRep x)) === do
diff --git a/postgresql-binary.cabal b/postgresql-binary.cabal
--- a/postgresql-binary.cabal
+++ b/postgresql-binary.cabal
@@ -1,7 +1,7 @@
 name:
   postgresql-binary
 version:
-  0.3.0
+  0.3.1
 synopsis:
   Encoders and decoders for the PostgreSQL's binary format
 description:
@@ -65,7 +65,7 @@
     PostgreSQLBinary.Decoder
   build-depends:
     -- parsers:
-    attoparsec == 0.12.*,
+    attoparsec >= 0.10 && < 0.13,
     -- data:
     uuid == 1.3.*,
     time >= 1.4 && < 1.6,
@@ -101,7 +101,7 @@
     postgresql-binary,
     HTF == 0.12.*,
     quickcheck-instances == 0.3.*,
-    QuickCheck == 2.7.*,
+    QuickCheck >= 2.6 && < 2.8,
     -- database:
     postgresql-libpq == 0.9.*,
     -- data: