diff --git a/concraft-pl.cabal b/concraft-pl.cabal
--- a/concraft-pl.cabal
+++ b/concraft-pl.cabal
@@ -1,5 +1,5 @@
 name:               concraft-pl
-version:            0.7.1
+version:            0.7.3
 synopsis:           Morphological tagger for Polish
 description:
     A morphological tagger for Polish based on the concraft library.
@@ -30,11 +30,11 @@
       , bytestring              >= 0.9      && < 0.11
       , text                    >= 0.11     && < 1.2
       , aeson                   >= 0.6      && < 0.8
-      , binary                  >= 0.5      && < 0.6
-      , process                 >= 1.1      && < 1.2
+      , binary                  >= 0.5      && < 0.8
+      , process                 >= 1.1      && < 1.3
       , mtl                     >= 2.0      && < 2.2
       , transformers            >= 0.2      && < 0.4
-      , network                 >= 2.3      && < 2.5
+      , network                 >= 2.3      && < 2.7
       , lazy-io                 >= 0.1      && < 0.2
       , split                   >= 0.2      && < 0.3
 
diff --git a/src/NLP/Concraft/Polish/Maca.hs b/src/NLP/Concraft/Polish/Maca.hs
--- a/src/NLP/Concraft/Polish/Maca.hs
+++ b/src/NLP/Concraft/Polish/Maca.hs
@@ -68,7 +68,7 @@
 -- | Run Maca server on given channels.
 -- TODO: Should check, if maca works.  In particular, if morfeusz is available.
 runMacaOn :: In -> Out -> IO ThreadId
-runMacaOn inCh outCh = forkIO . mask $ \restore -> do
+runMacaOn inCh outCh = mask $ \restore -> forkIO (do
     let cmd  = "maca-analyse"
         args = ["-q", "morfeusz-nkjp-official", "-o", "plain", "-l"]
     (Just inh, Just outh, Just errh, pid) <-
@@ -102,6 +102,7 @@
 
         -- Read maca response and put it in the output channel.
         writeChan outCh =<< readMacaResponse outh (textWeight txt)
+    )
 
 
 readMacaResponse :: Handle -> Int -> IO [Sent Tag]