diff --git a/Numeric/MCMC/Slice.hs b/Numeric/MCMC/Slice.hs
--- a/Numeric/MCMC/Slice.hs
+++ b/Numeric/MCMC/Slice.hs
@@ -42,7 +42,6 @@
 import Control.Monad.Codensity (lowerCodensity)
 import Control.Monad.Trans.State.Strict (put, get, execStateT)
 import Control.Monad.Primitive (PrimMonad, PrimState)
-import Control.Monad.IO.Class (MonadIO, liftIO)
 import Control.Lens hiding (index)
 import Data.Maybe (fromMaybe)
 import Data.Sampling.Types
diff --git a/speedy-slice.cabal b/speedy-slice.cabal
--- a/speedy-slice.cabal
+++ b/speedy-slice.cabal
@@ -1,5 +1,5 @@
 name:                speedy-slice
-version:             0.3.0
+version:             0.3.1
 synopsis:            Speedy slice sampling.
 homepage:            http://github.com/jtobin/speedy-slice
 license:             MIT
@@ -8,6 +8,7 @@
 maintainer:          jared@jtobin.ca
 category:            Math
 build-type:          Simple
+tested-with:         GHC == 8.8.3
 cabal-version:       >=1.10
 description:
   Speedy slice sampling.
@@ -62,7 +63,6 @@
     -rtsopts
   build-depends:
       base              >= 4 && < 6
-    , mwc-probability   >= 1.0.1
     , speedy-slice
 
 Test-suite bnn
@@ -74,7 +74,6 @@
     -rtsopts
   build-depends:
       base              >= 4 && < 6
-    , containers        >= 0.5 && < 0.6
-    , mwc-probability   >= 1.0.1
+    , containers        >= 0.5 && < 0.7
     , speedy-slice