diff --git a/gf.cabal b/gf.cabal
index dd06e2e51..0af269d29 100644
--- a/gf.cabal
+++ b/gf.cabal
@@ -108,7 +108,7 @@ executable gf
                  pretty,
                  mtl,
                  haskeline,
-                 parallel
+                 parallel>=3
   ghc-options: -threaded
   if flag(server)
     build-depends: httpd-shed, network, utf8-string, json, cgi