diff --git a/monad-dijkstra.cabal b/monad-dijkstra.cabal
--- a/monad-dijkstra.cabal
+++ b/monad-dijkstra.cabal
@@ -1,5 +1,5 @@
 name:                monad-dijkstra
-version:             0.1.1.2
+version:             0.1.1.3
 synopsis:            A monad transformer for weighted graph searches
 description:         A monad transformer for weighted graph searches using Dijkstra's or A* algorithm.
 homepage:            https://github.com/ennocramer/monad-dijkstra
@@ -7,7 +7,7 @@
 license-file:        LICENSE
 author:              Enno Cramer
 maintainer:          Enno Cramer <ecramer@memfrob.de>
-copyright:           Copyright (c) 2016 Enno Cramer
+copyright:           Copyright (c) 2016-2020 Enno Cramer
 category:            Control, Monads
 build-type:          Simple
 cabal-version:       >=1.10
@@ -16,11 +16,11 @@
   hs-source-dirs:      src
   exposed-modules:     Control.Monad.Search
   build-depends:       base >= 4.7 && < 5
-                     , containers >= 0.5.6.2 && < 0.6.1
-                     , transformers >= 0.4.2.0 && < 0.5.6
+                     , containers >= 0.5.6.2 && < 0.7
+                     , transformers >= 0.4.2.0 && < 0.6
                      , mtl >= 2.2.0 && < 2.3
                      , free >= 4.12.0 && < 5.2
-                     , psqueues >= 0.2.0.0 && < 0.2.8
+                     , psqueues >= 0.2.0.0 && < 0.3
   default-language:    Haskell2010
   ghc-options:         -Wall
 
@@ -43,7 +43,7 @@
   hs-source-dirs:      test
   main-is:             HLint.hs
   build-depends:       base >=4.7 && <5
-                     , hlint >= 1.0 && <3
+                     , hlint >= 1.0 && <4
   default-language:    Haskell2010
   ghc-options:         -Wall -threaded -rtsopts -with-rtsopts=-N
 
diff --git a/src/Control/Monad/Search.hs b/src/Control/Monad/Search.hs
--- a/src/Control/Monad/Search.hs
+++ b/src/Control/Monad/Search.hs
@@ -4,7 +4,6 @@
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}
 {-# LANGUAGE StandaloneDeriving         #-}
 {-# LANGUAGE FlexibleInstances          #-}
-{-# LANGUAGE MultiParamTypeClasses      #-}
 {-# LANGUAGE UndecidableInstances       #-}
 {-# LANGUAGE FunctionalDependencies     #-}