diff --git a/lib/Numeric/Sampling.hs b/lib/Numeric/Sampling.hs
--- a/lib/Numeric/Sampling.hs
+++ b/lib/Numeric/Sampling.hs
@@ -29,7 +29,7 @@
 #endif
 import           Data.Function               (on)
 import           Data.List                   (sortBy)
-import           Data.Vector                 (Vector)
+import qualified Data.Vector                 as V (toList)
 import           Numeric.Sampling.Internal
 import           System.Random.MWC
 
@@ -39,14 +39,14 @@
 --   being sampled from.
 sample
   :: (PrimMonad m, Foldable f)
-  => Int -> f a -> Gen (PrimState m) -> m (Maybe (Vector a))
+  => Int -> f a -> Gen (PrimState m) -> m (Maybe [a])
 sample n xs gen
   | n < 0     = return Nothing
-  | otherwise = F.foldM (randomN n gen) xs
+  | otherwise = fmap (fmap V.toList) (F.foldM (randomN n gen) xs)
 {-# INLINABLE sample #-}
 
 -- | (/O(n)/) 'sample' specialized to IO.
-sampleIO :: Foldable f => Int -> f a -> IO (Maybe (Vector a))
+sampleIO :: Foldable f => Int -> f a -> IO (Maybe [a])
 sampleIO n xs = do
   gen <- createSystemRandom
   sample n xs gen
diff --git a/sampling.cabal b/sampling.cabal
--- a/sampling.cabal
+++ b/sampling.cabal
@@ -1,5 +1,5 @@
 name:                sampling
-version:             0.1.1
+version:             0.2.0
 synopsis:            Sample values from collections.
 homepage:            https://github.com/jtobin/sampling
 license:             MIT
@@ -34,10 +34,10 @@
       Numeric.Sampling
   build-depends:
       base        < 5
-    , foldl
-    , mwc-random
+    , foldl       >= 1.1 && < 2
+    , mwc-random  >= 0.13 && < 0.14
     , primitive
-    , vector
+    , vector      >= 0.11 && < 0.12
 
 executable sampling-test
   hs-source-dirs: src