diff --git a/nonlinear-optimization.cabal b/nonlinear-optimization.cabal
--- a/nonlinear-optimization.cabal
+++ b/nonlinear-optimization.cabal
@@ -3,13 +3,12 @@
 Tested-With:         GHC
 Category:            Math
 Name:                nonlinear-optimization
-Version:             0.3.10
+Version:             0.3.11
 Stability:           experimental
 License:             GPL
 License-File:        LICENSE
 Copyright:           (c) 2010-2011 Felipe A. Lessa and William W. Hager
-Author:              Felipe A. Lessa (Haskell code),
-		     William W. Hager and Hongchao Zhang (CM_DESCENT code).
+Author:              Felipe A. Lessa (Haskell code), William W. Hager and Hongchao Zhang (CM_DESCENT code).
 Maintainer:          Felipe A. Lessa <felipe.lessa@gmail.com>
 Synopsis:            Various iterative algorithms for optimization of nonlinear functions.
 Description:
@@ -46,7 +45,7 @@
   Build-Depends:
       base      >= 3   && < 5
     , primitive >= 0.2 && < 0.7
-    , vector    >= 0.5 && < 0.12
+    , vector    >= 0.5 && <= 0.13
   Exposed-Modules:
     Numeric.Optimization.Algorithms.HagerZhang05
   Include-Dirs:
diff --git a/src/Numeric/Optimization/Algorithms/HagerZhang05.hsc b/src/Numeric/Optimization/Algorithms/HagerZhang05.hsc
--- a/src/Numeric/Optimization/Algorithms/HagerZhang05.hsc
+++ b/src/Numeric/Optimization/Algorithms/HagerZhang05.hsc
@@ -59,6 +59,7 @@
 import Foreign
 import Foreign.C
 import qualified System.IO.Unsafe as Unsafe
+import Prelude -- silence warning about import of Control.Applicative
 
 #ifdef DEBUG
 import Debug.Trace (trace)