diff --git a/IPv6DB.cabal b/IPv6DB.cabal
--- a/IPv6DB.cabal
+++ b/IPv6DB.cabal
@@ -1,5 +1,5 @@
 name:                IPv6DB
-version:             0.3.1
+version:             0.3.2
 synopsis:            A RESTful microService for IPv6-related data
 description:         IPv6DB is a RESTful microservice using Redis as backend
                      to store lists of IPv6 addresses and attach to each of
@@ -9,14 +9,16 @@
 license:             BSD3
 license-file:        LICENSE
 author:              Michel Boucey
-maintainer:          michel.boucey@cybervisible.fr
-copyright:           (c) 2017-2018 - Michel Boucey
+maintainer:          michel.boucey@gmail.com
+copyright:           (c) 2017-2020 - Michel Boucey
 category:            network, database
 build-type:          Simple
 cabal-version:       >=1.10
 extra-source-files:  README.md
                    , IPv6DB_APIv1.md
 
+Tested-With: GHC ==8.4.3 || ==8.6.5 || ==8.8.1
+
 Source-Repository head
   Type: git
   Location: https://github.com/MichelBoucey/IPv6DB.git
@@ -29,9 +31,9 @@
                     , base                 >= 4.8.2 && < 5.0
                     , bytestring           >= 0.10.6 && < 0.11
                     , IPv6Addr             >= 1.1.0 && < 1.2.0
-                    , hedis                >= 0.9.4 && < 0.11
+                    , hedis                >= 0.9.4 && < 0.13
                     , http-types           >= 0.9.1 && < 0.13
-                    , unordered-containers >= 0.2.7.2 && < 0.2.10
+                    , unordered-containers >= 0.2.7.2 && < 0.2.11
                     , mtl                  >= 2.2.1 && < 2.3
                     , text                 >= 1.2.2 && < 1.3
                     , vector               >= 0.11.0.0 && < 0.13
@@ -46,19 +48,19 @@
   build-depends:    aeson                >= 0.11.2 && < 1.5
                   , base                 >= 4.8.2 && < 5.0
                   , bytestring           >= 0.10.6 && < 0.11
-                  , fast-logger          >= 2.4.8 && < 2.5
-                  , IPv6Addr             >= 1.1.0 && < 1.2.0
+                  , fast-logger          >= 2.4.8 && < 3.1
+                  , IPv6Addr             >= 1.1.3 && < 1.2.0
                   , IPv6DB
-                  , hedis                >= 0.9.4 && < 0.11
+                  , hedis                >= 0.9.4 && < 0.13
                   , http-types           >= 0.9.1 && < 0.13
-                  , unordered-containers >= 0.2.7.2 && < 0.2.10
+                  , unordered-containers >= 0.2.7.2 && < 0.2.11
                   , mtl                  >= 2.2.1 && < 2.3
-                  , optparse-applicative >= 0.12.1.0 && < 0.15
+                  , optparse-applicative >= 0.12.1.0 && < 0.16
                   , text                 >= 1.2.2 && < 1.3
                   , vector               >= 0.11.0.0 && < 0.13
                   , wai                  >= 3.2.1 && < 3.3
                   , wai-logger           >= 2.2.7 && < 2.4
-                  , warp                 >= 3.2.9 && < 3.3
+                  , warp                 >= 3.2.9 && < 3.4
 
   default-language:  Haskell2010
   ghc-options:      -threaded -rtsopts -with-rtsopts=-N -Wall
diff --git a/LICENSE b/LICENSE
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2017, Michel Boucey
+Copyright (c) 2017-2018, Michel Boucey
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
diff --git a/app/Main.hs b/app/Main.hs
--- a/app/Main.hs
+++ b/app/Main.hs
@@ -100,7 +100,7 @@
 
           DELETE -> maybeJSONBody >>= maybe badJSONRequest answer
                     where
-                      answer ents = do
+                      answer ents =
                         runRedis redisConn (delByEntries ents) >>= \case
                           Right d ->
                             case d of
diff --git a/app/Options.hs b/app/Options.hs
--- a/app/Options.hs
+++ b/app/Options.hs
@@ -20,7 +20,7 @@
 opts = info (options <**> helper)
   ( fullDesc
     <> progDesc "RESTful Web Service for IPv6 related data"
-    <> header "IPv6DB v0.2.0 APIv1, (c) Michel Boucey 2017" )
+    <> header "IPv6DB v0.3.1 APIv1, (c) Michel Boucey 2017-2018" )
 
 options :: Parser Options
 options =
diff --git a/app/Types.hs b/app/Types.hs
--- a/app/Types.hs
+++ b/app/Types.hs
@@ -13,7 +13,7 @@
 
 import           Network.IPv6DB.Types
 
-data Env = Env { redisConn :: Connection }
+newtype Env = Env { redisConn :: Connection }
 
 data RedisResponse
   = RedisOk
@@ -32,7 +32,7 @@
       ]
   toJSON _ = Null
 
-data RedisErrors = RedisErrors [RedisResponse] deriving (Eq, Show)
+newtype RedisErrors = RedisErrors [RedisResponse] deriving (Eq, Show)
 
 instance ToJSON RedisErrors where
   toJSON (RedisErrors rrs) =
diff --git a/src/Network/IPv6DB/Types.hs b/src/Network/IPv6DB/Types.hs
--- a/src/Network/IPv6DB/Types.hs
+++ b/src/Network/IPv6DB/Types.hs
@@ -9,7 +9,7 @@
 import qualified Data.Vector     as V
 import           Text.IPv6Addr
 
-data Addresses = Addresses [IPv6Addr]
+newtype Addresses = Addresses [IPv6Addr]
 
 instance FromJSON Addresses where
   parseJSON (Array v) = do
@@ -22,7 +22,7 @@
 data Entry =
   Entry
     { list    :: !T.Text
-    , address :: !IPv6Addr
+    , address :: IPv6Addr
     } deriving (Eq, Show)
 
 instance FromJSON Entry where
@@ -32,7 +32,7 @@
     pure Entry{..}
   parseJSON _          = fail "JSON Object Expected"
 
-data Entries = Entries [Entry]
+newtype Entries = Entries [Entry]
 
 instance FromJSON Entries where
   parseJSON (Array v) = do
@@ -42,7 +42,7 @@
       else fail "Malformed JSON Array"
   parseJSON _         = fail "JSON Array Expected"
 
-data Source = Source !Value deriving (Eq, Show)
+newtype Source = Source Value deriving (Eq, Show)
 
 instance ToJSON Source where
   toJSON (Source v) = v
@@ -93,7 +93,7 @@
         source  <- o .: "source"
         return Resource{..}
 
-data Resources = Resources [Resource] deriving (Eq, Show)
+newtype Resources = Resources [Resource] deriving (Eq, Show)
 
 instance ToJSON Resources where
   toJSON (Resources rs) =