diff --git a/Setup.hs b/Setup.hs
--- a/Setup.hs
+++ b/Setup.hs
@@ -1,2 +1,7 @@
-import Distribution.Simple
-main = defaultMain
+module Main (main) where
+
+import RIO
+import Distribution.Extra.Doctest ( defaultMainWithDoctests )
+
+main :: IO ()
+main = defaultMainWithDoctests "doctests"
diff --git a/src/Tonatona/Persist/Postgresql.hs b/src/Tonatona/Persist/Postgresql.hs
--- a/src/Tonatona/Persist/Postgresql.hs
+++ b/src/Tonatona/Persist/Postgresql.hs
@@ -59,7 +59,6 @@
   , connNum :: DbConnNum
   , connPool :: Pool SqlBackend
   }
-  deriving (Show)
 
 instance HasParser Config where
   parser = do
diff --git a/test/DocTest.hs b/test/DocTest.hs
deleted file mode 100644
--- a/test/DocTest.hs
+++ /dev/null
@@ -1,56 +0,0 @@
-module Main (main) where
-
-import RIO
-
-import System.FilePath.Glob (glob)
-import Test.DocTest (doctest)
-
-main :: IO ()
-main = glob "src/**/*.hs" >>= doDocTest
-
-doDocTest :: [String] -> IO ()
-doDocTest options =
-  doctest $
-    options <>
-    ghcExtensions
-
-ghcExtensions :: [String]
-ghcExtensions =
-    [ "-XBangPatterns"
-    , "-XBinaryLiterals"
-    , "-XConstraintKinds"
-    , "-XDataKinds"
-    , "-XDefaultSignatures"
-    , "-XDeriveDataTypeable"
-    , "-XDeriveFoldable"
-    , "-XDeriveFunctor"
-    , "-XDeriveGeneric"
-    , "-XDeriveTraversable"
-    , "-XDoAndIfThenElse"
-    , "-XEmptyDataDecls"
-    , "-XExistentialQuantification"
-    , "-XFlexibleContexts"
-    , "-XFlexibleInstances"
-    , "-XFunctionalDependencies"
-    , "-XGADTs"
-    , "-XGeneralizedNewtypeDeriving"
-    , "-XInstanceSigs"
-    , "-XKindSignatures"
-    , "-XLambdaCase"
-    , "-XMultiParamTypeClasses"
-    , "-XMultiWayIf"
-    , "-XNamedFieldPuns"
-    , "-XNoImplicitPrelude"
-    , "-XOverloadedStrings"
-    , "-XPartialTypeSignatures"
-    , "-XPatternGuards"
-    , "-XPolyKinds"
-    , "-XRankNTypes"
-    , "-XRecordWildCards"
-    , "-XScopedTypeVariables"
-    , "-XStandaloneDeriving"
-    , "-XTupleSections"
-    , "-XTypeFamilies"
-    , "-XTypeSynonymInstances"
-    , "-XViewPatterns"
-    ]
diff --git a/test/doctests.hs b/test/doctests.hs
new file mode 100644
--- /dev/null
+++ b/test/doctests.hs
@@ -0,0 +1,9 @@
+module Main where
+
+import RIO
+import Build_doctests (flags, pkgs, module_sources)
+import Test.DocTest
+
+main :: IO ()
+main = do
+  doctest $ flags ++ pkgs ++ module_sources
diff --git a/tonatona-persistent-postgresql.cabal b/tonatona-persistent-postgresql.cabal
--- a/tonatona-persistent-postgresql.cabal
+++ b/tonatona-persistent-postgresql.cabal
@@ -1,13 +1,11 @@
-cabal-version: 1.12
+cabal-version: 1.24
 
--- This file has been generated from package.yaml by hpack version 0.33.0.
+-- This file has been generated from package.yaml by hpack version 0.35.1.
 --
 -- see: https://github.com/sol/hpack
---
--- hash: 6b21127161ffe2a460df786cef8ca84293784909b59252bb684fa2a4bfa13ca4
 
 name:           tonatona-persistent-postgresql
-version:        0.1.0.2
+version:        0.2.0.0
 synopsis:       tonatona plugin for accessing PostgreSQL database.
 description:    Tonatona plugin for accessing PostgreSQL database. This package provides a tonatona plugin for accessing PostgreSQL database. This plugin uses persistent to actually accessing PostgreSQL.
 category:       Database, Library, Tonatona
@@ -18,7 +16,9 @@
 copyright:      2018 Kadzuya Okamoto
 license:        MIT
 license-file:   LICENSE
-build-type:     Simple
+build-type:     Custom
+tested-with:
+    GHC==9.4.6, GHC==9.2.8, GHC==9.0.2, GHC==8.10.7
 extra-source-files:
     README.md
 
@@ -26,6 +26,13 @@
   type: git
   location: https://github.com/tonatona-project/tonatona
 
+custom-setup
+  setup-depends:
+      Cabal <3.12
+    , base >=4.14 && <4.18
+    , cabal-doctest >=1 && <1.1
+    , rio ==0.1.*
+
 library
   exposed-modules:
       Tonatona.Persist.Postgresql
@@ -33,37 +40,114 @@
       Paths_tonatona_persistent_postgresql
   hs-source-dirs:
       src
-  default-extensions: BangPatterns BinaryLiterals ConstraintKinds DataKinds DefaultSignatures DeriveDataTypeable DeriveFoldable DeriveFunctor DeriveGeneric DeriveTraversable DoAndIfThenElse EmptyDataDecls ExistentialQuantification FlexibleContexts FlexibleInstances FunctionalDependencies GADTs GeneralizedNewtypeDeriving InstanceSigs KindSignatures LambdaCase MultiParamTypeClasses MultiWayIf NamedFieldPuns NoImplicitPrelude OverloadedStrings PartialTypeSignatures PatternGuards PolyKinds RankNTypes RecordWildCards ScopedTypeVariables StandaloneDeriving Strict StrictData TupleSections TypeFamilies TypeSynonymInstances ViewPatterns
+  default-extensions:
+      BangPatterns
+      BinaryLiterals
+      ConstraintKinds
+      DataKinds
+      DefaultSignatures
+      DeriveDataTypeable
+      DeriveFoldable
+      DeriveFunctor
+      DeriveGeneric
+      DeriveTraversable
+      DoAndIfThenElse
+      EmptyDataDecls
+      ExistentialQuantification
+      FlexibleContexts
+      FlexibleInstances
+      FunctionalDependencies
+      GADTs
+      GeneralizedNewtypeDeriving
+      InstanceSigs
+      KindSignatures
+      LambdaCase
+      MultiParamTypeClasses
+      MultiWayIf
+      NamedFieldPuns
+      NoImplicitPrelude
+      OverloadedStrings
+      PartialTypeSignatures
+      PatternGuards
+      PolyKinds
+      RankNTypes
+      RecordWildCards
+      ScopedTypeVariables
+      StandaloneDeriving
+      Strict
+      StrictData
+      TupleSections
+      TypeFamilies
+      TypeSynonymInstances
+      ViewPatterns
   ghc-options: -Wcompat -Wincomplete-record-updates -Wincomplete-uni-patterns -Wredundant-constraints
   build-depends:
-      base >=4.7 && <4.15
-    , monad-logger >=0.3 && <0.4
-    , persistent >=2.8 && <2.11
-    , persistent-postgresql >=2.8 && <2.11
-    , resource-pool >=0.2 && <0.3
-    , rio >=0.1 && <0.2
-    , tonaparser >=0.1 && <0.2
-    , tonatona >=0.1 && <0.2
+      base >=4.14 && <4.18
+    , monad-logger ==0.3.*
+    , persistent >=2.13 && <2.15
+    , persistent-postgresql ==2.13.*
+    , resource-pool >=0.2 && <0.5
+    , rio ==0.1.*
+    , tonaparser ==0.2.*
+    , tonatona ==0.2.*
   default-language: Haskell2010
 
-test-suite doctest
+test-suite doctests
   type: exitcode-stdio-1.0
-  main-is: DocTest.hs
+  main-is: doctests.hs
   hs-source-dirs:
       test
-  default-extensions: BangPatterns BinaryLiterals ConstraintKinds DataKinds DefaultSignatures DeriveDataTypeable DeriveFoldable DeriveFunctor DeriveGeneric DeriveTraversable DoAndIfThenElse EmptyDataDecls ExistentialQuantification FlexibleContexts FlexibleInstances FunctionalDependencies GADTs GeneralizedNewtypeDeriving InstanceSigs KindSignatures LambdaCase MultiParamTypeClasses MultiWayIf NamedFieldPuns NoImplicitPrelude OverloadedStrings PartialTypeSignatures PatternGuards PolyKinds RankNTypes RecordWildCards ScopedTypeVariables StandaloneDeriving Strict StrictData TupleSections TypeFamilies TypeSynonymInstances ViewPatterns
+  default-extensions:
+      BangPatterns
+      BinaryLiterals
+      ConstraintKinds
+      DataKinds
+      DefaultSignatures
+      DeriveDataTypeable
+      DeriveFoldable
+      DeriveFunctor
+      DeriveGeneric
+      DeriveTraversable
+      DoAndIfThenElse
+      EmptyDataDecls
+      ExistentialQuantification
+      FlexibleContexts
+      FlexibleInstances
+      FunctionalDependencies
+      GADTs
+      GeneralizedNewtypeDeriving
+      InstanceSigs
+      KindSignatures
+      LambdaCase
+      MultiParamTypeClasses
+      MultiWayIf
+      NamedFieldPuns
+      NoImplicitPrelude
+      OverloadedStrings
+      PartialTypeSignatures
+      PatternGuards
+      PolyKinds
+      RankNTypes
+      RecordWildCards
+      ScopedTypeVariables
+      StandaloneDeriving
+      Strict
+      StrictData
+      TupleSections
+      TypeFamilies
+      TypeSynonymInstances
+      ViewPatterns
   ghc-options: -Wcompat -Wincomplete-record-updates -Wincomplete-uni-patterns -Wredundant-constraints
   build-depends:
-      Glob
-    , base >=4.7 && <4.15
+      base >=4.14 && <4.18
     , doctest
-    , monad-logger >=0.3 && <0.4
-    , persistent >=2.8 && <2.11
-    , persistent-postgresql >=2.8 && <2.11
-    , resource-pool >=0.2 && <0.3
-    , rio >=0.1 && <0.2
-    , tonaparser >=0.1 && <0.2
-    , tonatona >=0.1 && <0.2
+    , monad-logger ==0.3.*
+    , persistent >=2.13 && <2.15
+    , persistent-postgresql ==2.13.*
+    , resource-pool >=0.2 && <0.5
+    , rio ==0.1.*
+    , tonaparser ==0.2.*
+    , tonatona ==0.2.*
   default-language: Haskell2010
 
 test-suite spec
@@ -71,15 +155,54 @@
   main-is: Spec.hs
   hs-source-dirs:
       test
-  default-extensions: BangPatterns BinaryLiterals ConstraintKinds DataKinds DefaultSignatures DeriveDataTypeable DeriveFoldable DeriveFunctor DeriveGeneric DeriveTraversable DoAndIfThenElse EmptyDataDecls ExistentialQuantification FlexibleContexts FlexibleInstances FunctionalDependencies GADTs GeneralizedNewtypeDeriving InstanceSigs KindSignatures LambdaCase MultiParamTypeClasses MultiWayIf NamedFieldPuns NoImplicitPrelude OverloadedStrings PartialTypeSignatures PatternGuards PolyKinds RankNTypes RecordWildCards ScopedTypeVariables StandaloneDeriving Strict StrictData TupleSections TypeFamilies TypeSynonymInstances ViewPatterns
+  default-extensions:
+      BangPatterns
+      BinaryLiterals
+      ConstraintKinds
+      DataKinds
+      DefaultSignatures
+      DeriveDataTypeable
+      DeriveFoldable
+      DeriveFunctor
+      DeriveGeneric
+      DeriveTraversable
+      DoAndIfThenElse
+      EmptyDataDecls
+      ExistentialQuantification
+      FlexibleContexts
+      FlexibleInstances
+      FunctionalDependencies
+      GADTs
+      GeneralizedNewtypeDeriving
+      InstanceSigs
+      KindSignatures
+      LambdaCase
+      MultiParamTypeClasses
+      MultiWayIf
+      NamedFieldPuns
+      NoImplicitPrelude
+      OverloadedStrings
+      PartialTypeSignatures
+      PatternGuards
+      PolyKinds
+      RankNTypes
+      RecordWildCards
+      ScopedTypeVariables
+      StandaloneDeriving
+      Strict
+      StrictData
+      TupleSections
+      TypeFamilies
+      TypeSynonymInstances
+      ViewPatterns
   ghc-options: -Wcompat -Wincomplete-record-updates -Wincomplete-uni-patterns -Wredundant-constraints
   build-depends:
-      base >=4.7 && <4.15
-    , monad-logger >=0.3 && <0.4
-    , persistent >=2.8 && <2.11
-    , persistent-postgresql >=2.8 && <2.11
-    , resource-pool >=0.2 && <0.3
-    , rio >=0.1 && <0.2
-    , tonaparser >=0.1 && <0.2
+      base >=4.14 && <4.18
+    , monad-logger ==0.3.*
+    , persistent >=2.13 && <2.15
+    , persistent-postgresql ==2.13.*
+    , resource-pool >=0.2 && <0.5
+    , rio ==0.1.*
+    , tonaparser ==0.2.*
     , tonatona
   default-language: Haskell2010