diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -5,6 +5,11 @@
 ## Unreleased changes
 
 
+## 0.1.0.6
+
+-   Tooling.
+
+
 ## 0.1.0.5
 
 -   Minor changes; tooling; Nix support.
diff --git a/Setup.hs b/Setup.hs
deleted file mode 100644
--- a/Setup.hs
+++ /dev/null
@@ -1,2 +0,0 @@
-import Distribution.Simple
-main = defaultMain
diff --git a/dirichlet.cabal b/dirichlet.cabal
--- a/dirichlet.cabal
+++ b/dirichlet.cabal
@@ -1,6 +1,6 @@
-cabal-version:       2.4
+cabal-version:       3.0
 name:                dirichlet
-version:             0.1.0.5
+version:             0.1.0.6
 synopsis:            Multivariate Dirichlet distribution
 description:         Please see the README on GitHub at <https://github.com/dschrempf/dirichlet#readme>
 homepage:            https://github.com/dschrempf/dirichlet
diff --git a/src/Statistics/Distribution/Dirichlet.hs b/src/Statistics/Distribution/Dirichlet.hs
--- a/src/Statistics/Distribution/Dirichlet.hs
+++ b/src/Statistics/Distribution/Dirichlet.hs
@@ -60,9 +60,9 @@
 dirichletDistribution :: V.Vector Double -> Either String DirichletDistribution
 dirichletDistribution v
   | V.length v < 2 =
-    Left "dirichletDistribution: Parameter vector is too short."
+      Left "dirichletDistribution: Parameter vector is too short."
   | isNegativeOrZero v =
-    Left "dirichletDistribution: One or more parameters are negative or zero."
+      Left "dirichletDistribution: One or more parameters are negative or zero."
   | otherwise = Right $ DirichletDistribution v (V.length v) (invBeta v)
 
 -- Tolerance.
@@ -125,9 +125,9 @@
 dirichletDistributionSymmetric :: Int -> Double -> Either String DirichletDistributionSymmetric
 dirichletDistributionSymmetric k a
   | k < 2 =
-    Left "dirichletDistributionSymmetric: The dimension is smaller than two."
+      Left "dirichletDistributionSymmetric: The dimension is smaller than two."
   | a <= 0 =
-    Left "dirichletDistributionSymmetric: The parameter is negative or zero."
+      Left "dirichletDistributionSymmetric: The parameter is negative or zero."
   | otherwise = Right $ DirichletDistributionSymmetric a k (invBetaSym k a)
 
 -- | Density of the symmetric Dirichlet distribution evaluated at a given value
diff --git a/test/Statistics/Distribution/DirichletSpec.hs b/test/Statistics/Distribution/DirichletSpec.hs
--- a/test/Statistics/Distribution/DirichletSpec.hs
+++ b/test/Statistics/Distribution/DirichletSpec.hs
@@ -19,8 +19,8 @@
 import qualified Data.Vector.Unboxed as V
 import Numeric.Log hiding (sum)
 import Statistics.Distribution.Dirichlet
-import Test.Hspec
 import System.Random.MWC
+import Test.Hspec
 
 eps :: Double
 eps = 1e-14
@@ -40,7 +40,8 @@
 -- Extract means.
 xbar :: Int -> [V.Vector Double] -> Double
 xbar n xss = sum xs / fromIntegral (length xs)
-  where xs = map (V.! n) xss
+  where
+    xs = map (V.! n) xss
 
 spec :: Spec
 spec = do
@@ -72,9 +73,9 @@
       xs <- replicateM 1000 (dirichletSample ddSym10 g)
       map V.length xs `shouldBe` replicate 1000 10
       -- print [ xbar i xs | i <- [0..9]]
-      [ abs (xbar i xs - 0.1) > 0.01 | i <- [0..9]] `shouldBe` replicate 10 False
+      [abs (xbar i xs - 0.1) > 0.01 | i <- [0 .. 9]] `shouldBe` replicate 10 False
       xs' <- replicateM 1000 (dirichletSample dd10 g)
       map V.length xs' `shouldBe` replicate 1000 10
       -- print [ xbar i xs | i <- [0..9]]
       let aSum = V.sum alphas10
-      [ abs (xbar i xs' - (alphas10 V.! i / aSum)) > 0.01 | i <- [0..9]] `shouldBe` replicate 10 False
+      [abs (xbar i xs' - (alphas10 V.! i / aSum)) > 0.01 | i <- [0 .. 9]] `shouldBe` replicate 10 False