diff --git a/CHANGELOG.md b/CHANGELOG.md
index 028ad7b..efd9b32 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,7 @@
 # Revision history for mmzk-typeid
 
 
-## 0.6.0.2 -- Unreleased
+## 0.6.0.0 -- Unreleased
 
 * Update implementation to conform with specification v0.3.0.
   * Allow `TypeID` prefix to contain underscores.
diff --git a/mmzk-typeid.cabal b/mmzk-typeid.cabal
index bcf0f32..a7e1b7c 100644
--- a/mmzk-typeid.cabal
+++ b/mmzk-typeid.cabal
@@ -1,6 +1,6 @@
 cabal-version:      2.4
 name:               mmzk-typeid
-version:            0.5.0.2
+version:            0.6.0.0
 
 synopsis:           A TypeID implementation for Haskell
 description:
@@ -98,7 +98,7 @@ library
         aeson >=2.1 && <3,
         array ^>=0.5,
         binary >=0.8.5 && <0.9,
-        bytestring ^>= 0.11,
+        bytestring ^>=0.11,
         entropy ^>=0.4,
         hashable ^>=1.4,
         random ^>=1.2,
diff --git a/src/Data/TypeID/Internal.hs b/src/Data/TypeID/Internal.hs
index f33ec3d..997ea29 100644
--- a/src/Data/TypeID/Internal.hs
+++ b/src/Data/TypeID/Internal.hs
@@ -1,4 +1,3 @@
-{-# LANGUAGE UndecidableInstances #-}
 -- |
 -- Module      : Data.TypeID.Internal
 -- License     : MIT
@@ -121,9 +120,9 @@ instance Binary (TypeID' version) where
     uuid          <- get
     len           <- getWord8
     encodedPrefix <- separate5BitInts <$> replicateM (fromIntegral len) getWord8
-    when (length encodedPrefix > 63) $ fail "Binary: Prefix too long"
-    when (any (liftM2 (&&) (< 1) (> 26)) encodedPrefix)
-         (fail "Binary: Invalid prefix")
+    when (length encodedPrefix > 63) do fail "Binary: Prefix too long"
+    when (any (liftM2 (&&) (< 1) (> 26)) encodedPrefix) do
+      fail "Binary: Invalid prefix"
     let back 27 = 95
         back a  = a + 96
     pure $ TypeID' (decodeUtf8 . BS.pack $ fmap back encodedPrefix) uuid
@@ -146,8 +145,8 @@ instance Storable (TypeID' version) where
     encodedPrefix <- separate5BitInts
                  <$> forM [1..len] \ix -> peekByteOff @Word8 ptr (16 + ix)
     when (length encodedPrefix > 63) $ fail "Storable: Prefix too long"
-    when (any (liftM2 (&&) (< 1) (> 26)) encodedPrefix)
-         (fail "Storable: Invalid prefix")
+    when (any (liftM2 (&&) (< 1) (> 26)) encodedPrefix) do
+      fail "Storable: Invalid prefix"
     let back 27 = 95
         back a  = a + 96
     pure $ TypeID' (decodeUtf8 . BS.pack $ fmap back encodedPrefix) uuid
@@ -761,7 +760,8 @@ decodeUUID :: ByteString -> Either TypeIDError UUID
 decodeUUID bs = do
   unless (BSL.length bs == 26) $ Left TypeIDErrorUUIDError
   unless (bs `BSL.index` 0 <= 55) $ Left TypeIDErrorUUIDError
-  when (any ((== 0xFF) . (base32Table !)) $ BSL.unpack bs) $ Left TypeIDErrorUUIDError
+  when (any ((== 0xFF) . (base32Table !)) $ BSL.unpack bs) do
+    Left TypeIDErrorUUIDError
   pure $ unsafeDecodeUUID bs
 {-# INLINE decodeUUID #-}