diff --git a/CHANGES b/CHANGES
--- a/CHANGES
+++ b/CHANGES
@@ -106,3 +106,6 @@
 
 0.2.5.3:
 		updated for hmatrix 0.17
+
+0.2.5.4:
+		updated for hmatrix 0.18
diff --git a/hstatistics.cabal b/hstatistics.cabal
--- a/hstatistics.cabal
+++ b/hstatistics.cabal
@@ -1,8 +1,8 @@
 Name:               hstatistics
-Version:            0.2.5.3
+Version:            0.2.5.4
 License:            BSD3
 License-file:       LICENSE
-Copyright:          (c) A.V.H. McPhail 2010, 2011, 2012, 2013, 2014
+Copyright:          (c) A.V.H. McPhail 2010, 2011, 2012, 2013, 2014, 2016
 Author:             Vivian McPhail
 Maintainer:         haskell.vivian.mcphail <at> gmail <dot> com
 Stability:          provisional
@@ -16,7 +16,7 @@
      .
      Feature requests, suggestions, and bug fixes welcome.
 Category:           Math, Statistics
-tested-with:        GHC ==7.10.2
+tested-with:        GHC ==8.0.1
 
 cabal-version:      >=1.8
 
diff --git a/lib/Numeric/Statistics.hs b/lib/Numeric/Statistics.hs
--- a/lib/Numeric/Statistics.hs
+++ b/lib/Numeric/Statistics.hs
@@ -79,7 +79,7 @@
 meanArray a = meanList $ I.elems a
 
 -- | the mean of a matrix with data series in rows
-meanMatrix :: (Container Vector a, Num (Vector a), Element a, Fractional a) => Matrix a -> Sample a
+meanMatrix :: (Container Vector a, Num (Vector a), Fractional a) => Matrix a -> Sample a
 meanMatrix a = meanList $ toRows a
 
 -----------------------------------------------------------------------------
@@ -93,11 +93,11 @@
                    in mxs - msx
 
 -- | the variance of an array of vectors
-varianceArray :: (Container Vector a, Floating (Vector a), Num a, Fractional a) => Samples a -> Sample a
+varianceArray :: (Container Vector a, Floating (Vector a), Fractional a) => Samples a -> Sample a
 varianceArray a = varianceList $ I.elems a
 
 -- | the variance of a matrix with data series in rows
-varianceMatrix :: (Container Vector a, Floating (Vector a), Element a, Num a, Fractional a) => Matrix a -> Sample a
+varianceMatrix :: (Container Vector a, Floating (Vector a), Fractional a) => Matrix a -> Sample a
 varianceMatrix a = varianceList $ toRows a
 
 -----------------------------------------------------------------------------
@@ -253,7 +253,7 @@
 -----------------------------------------------------------------------------
 
 -- | count the number of runs greater than or equal to @n@ in the data
-run_count :: (Num a, Num t, Ord b, Ord a, Storable b, Container Vector b) 
+run_count :: (Num a, Num t, Ord b, Ord a, Container Vector b) 
             => a             -- ^ longest run to count
           -> Vector b        -- ^ data
           -> [(a, t)]        -- ^ [(run length,count)]