diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
--- a/.travis.yml
+++ /dev/null
@@ -1,146 +0,0 @@
-# This Travis job script has been generated by a script via
-#
-#   runghc make_travis_yml_2.hs '-o' '.travis.yml' '--irc-channel=irc.freenode.org#haskell-lens' '--no-no-tests-no-bench' '--no-installed' 'cabal.project'
-#
-# For more information, see https://github.com/hvr/multi-ghc-travis
-#
-language: c
-sudo: false
-
-git:
-  submodules: false  # whether to recursively clone submodules
-
-notifications:
-  irc:
-    channels:
-      - "irc.freenode.org#haskell-lens"
-    skip_join: true
-    template:
-      - "\x0313adjunctions\x03/\x0306%{branch}\x03 \x0314%{commit}\x03 %{build_url} %{message}"
-
-cache:
-  directories:
-    - $HOME/.cabal/packages
-    - $HOME/.cabal/store
-
-before_cache:
-  - rm -fv $HOME/.cabal/packages/hackage.haskell.org/build-reports.log
-  # remove files that are regenerated by 'cabal update'
-  - rm -fv $HOME/.cabal/packages/hackage.haskell.org/00-index.*
-  - rm -fv $HOME/.cabal/packages/hackage.haskell.org/*.json
-  - rm -fv $HOME/.cabal/packages/hackage.haskell.org/01-index.cache
-  - rm -fv $HOME/.cabal/packages/hackage.haskell.org/01-index.tar
-  - rm -fv $HOME/.cabal/packages/hackage.haskell.org/01-index.tar.idx
-
-  - rm -rfv $HOME/.cabal/packages/head.hackage
-
-addons:
-  apt:
-    packages: &apt_packages
-      - ghc-ppa-tools
-      - alex-3.1.7
-      - happy-1.19.5
-
-matrix:
-  include:
-    - compiler: "ghc-7.4.2"
-    # env: TEST=--disable-tests BENCH=--disable-benchmarks
-      addons: {apt: {packages: [*apt_packages,cabal-install-2.0,ghc-7.4.2], sources: [hvr-ghc]}}
-    - compiler: "ghc-7.6.3"
-    # env: TEST=--disable-tests BENCH=--disable-benchmarks
-      addons: {apt: {packages: [*apt_packages,cabal-install-2.0,ghc-7.6.3], sources: [hvr-ghc]}}
-    - compiler: "ghc-7.8.4"
-    # env: TEST=--disable-tests BENCH=--disable-benchmarks
-      addons: {apt: {packages: [*apt_packages,cabal-install-2.0,ghc-7.8.4], sources: [hvr-ghc]}}
-    - compiler: "ghc-7.10.3"
-    # env: TEST=--disable-tests BENCH=--disable-benchmarks
-      addons: {apt: {packages: [*apt_packages,cabal-install-2.0,ghc-7.10.3], sources: [hvr-ghc]}}
-    - compiler: "ghc-8.0.2"
-    # env: TEST=--disable-tests BENCH=--disable-benchmarks
-      addons: {apt: {packages: [*apt_packages,cabal-install-2.0,ghc-8.0.2], sources: [hvr-ghc]}}
-    - compiler: "ghc-8.2.2"
-    # env: TEST=--disable-tests BENCH=--disable-benchmarks
-      addons: {apt: {packages: [*apt_packages,cabal-install-2.0,ghc-8.2.2], sources: [hvr-ghc]}}
-    - compiler: "ghc-8.4.1"
-      env: GHCHEAD=true
-      addons: {apt: {packages: [*apt_packages,cabal-install-head,ghc-8.4.1], sources: [hvr-ghc]}}
-    - compiler: "ghc-head"
-      env: GHCHEAD=true
-      addons: {apt: {packages: [*apt_packages,cabal-install-head,ghc-head], sources: [hvr-ghc]}}
-
-  allow_failures:
-    - compiler: "ghc-8.4.1"
-    - compiler: "ghc-head"
-
-before_install:
-  - HC=${CC}
-  - HCPKG=${HC/ghc/ghc-pkg}
-  - unset CC
-  - ROOTDIR=$(pwd)
-  - mkdir -p $HOME/.local/bin
-  - "PATH=/opt/ghc/bin:/opt/ghc-ppa-tools/bin:$HOME/local/bin:$PATH"
-  - HCNUMVER=$(( $(${HC} --numeric-version|sed -E 's/([0-9]+)\.([0-9]+)\.([0-9]+).*/\1 * 10000 + \2 * 100 + \3/') ))
-  - echo $HCNUMVER
-
-install:
-  - cabal --version
-  - echo "$(${HC} --version) [$(${HC} --print-project-git-commit-id 2> /dev/null || echo '?')]"
-  - BENCH=${BENCH---enable-benchmarks}
-  - TEST=${TEST---enable-tests}
-  - HADDOCK=${HADDOCK-true}
-  - INSTALLED=${INSTALLED-true}
-  - GHCHEAD=${GHCHEAD-false}
-  - travis_retry cabal update -v
-  - "sed -i.bak 's/^jobs:/-- jobs:/' ${HOME}/.cabal/config"
-  - rm -fv cabal.project cabal.project.local
-  # Overlay Hackage Package Index for GHC HEAD: https://github.com/hvr/head.hackage
-  - |
-    if $GHCHEAD; then
-      sed -i.bak 's/-- allow-newer:.*/allow-newer: *:base, *:template-haskell, *:ghc, *:Cabal/' ${HOME}/.cabal/config
-
-      echo 'repository head.hackage'                                                        >> ${HOME}/.cabal/config
-      echo '   url: http://head.hackage.haskell.org/'                                       >> ${HOME}/.cabal/config
-      echo '   secure: True'                                                                >> ${HOME}/.cabal/config
-      echo '   root-keys: 07c59cb65787dedfaef5bd5f987ceb5f7e5ebf88b904bbd4c5cbdeb2ff71b740' >> ${HOME}/.cabal/config
-      echo '              2e8555dde16ebd8df076f1a8ef13b8f14c66bad8eafefd7d9e37d0ed711821fb' >> ${HOME}/.cabal/config
-      echo '              8f79fd2389ab2967354407ec852cbe73f2e8635793ac446d09461ffb99527f6e' >> ${HOME}/.cabal/config
-      echo '   key-threshold: 3'                                                            >> ${HOME}/.cabal.config
-
-      cabal new-update head.hackage -v
-    fi
-  - grep -Ev -- '^\s*--' ${HOME}/.cabal/config | grep -Ev '^\s*$'
-  - "printf 'packages: \".\"\\n' > cabal.project"
-  - cat cabal.project
-  - if [ -f "./configure.ac" ]; then
-      (cd "." && autoreconf -i);
-    fi
-  - rm -f cabal.project.freeze
-  - cabal new-build -w ${HC} ${TEST} ${BENCH} --project-file="cabal.project" --dep -j2 all
-  - rm -rf "."/.ghc.environment.* "."/dist
-  - DISTDIR=$(mktemp -d /tmp/dist-test.XXXX)
-
-# Here starts the actual work to be performed for the package under test;
-# any command which exits with a non-zero exit code causes the build to fail.
-script:
-  # test that source-distributions can be generated
-  - (cd "." && cabal sdist)
-  - mv "."/dist/adjunctions-*.tar.gz ${DISTDIR}/
-  - cd ${DISTDIR} || false
-  - find . -maxdepth 1 -name '*.tar.gz' -exec tar -xvf '{}' \;
-  - "printf 'packages: adjunctions-*/*.cabal\\n' > cabal.project"
-  - cat cabal.project
-
-
-  # build & run tests, build benchmarks
-  - cabal new-build -w ${HC} ${TEST} ${BENCH} all
-  - if [ "x$TEST" = "x--enable-tests" ]; then cabal new-test -w ${HC} ${TEST} ${BENCH} all; fi
-
-  # cabal check
-  - (cd adjunctions-* && cabal check)
-
-  # haddock
-  - rm -rf ./dist-newstyle
-  - if $HADDOCK; then cabal new-haddock -w ${HC} ${TEST} ${BENCH} all; else echo "Skipping haddock generation";fi
-
-# REGENDATA ["-o",".travis.yml","--irc-channel=irc.freenode.org#haskell-lens","--no-no-tests-no-bench","--no-installed","cabal.project"]
-# EOF
diff --git a/CHANGELOG.markdown b/CHANGELOG.markdown
--- a/CHANGELOG.markdown
+++ b/CHANGELOG.markdown
@@ -1,3 +1,7 @@
+4.4.1 [2022.05.07]
+------------------
+* Allow building with `transformers-0.6.*` and `mtl-2.3.*`.
+
 4.4 [2018.01.28]
 ----------------
 * Added `imapRep`, `ifoldMapRep`, `itraverseRep` to make it easier to define representable `FunctorWithIndex`, `FoldableWithIndex`, `TraversableWithIndex` instances from the `lens` package.
diff --git a/README.markdown b/README.markdown
--- a/README.markdown
+++ b/README.markdown
@@ -1,7 +1,7 @@
 adjunctions
 ==========
 
-[![Hackage](https://img.shields.io/hackage/v/adjunctions.svg)](https://hackage.haskell.org/package/adjunctions) [![Build Status](https://secure.travis-ci.org/ekmett/adjunctions.png?branch=master)](http://travis-ci.org/ekmett/adjunctions)
+[![Hackage](https://img.shields.io/hackage/v/adjunctions.svg)](https://hackage.haskell.org/package/adjunctions) [![Build Status](https://github.com/ekmett/adjunctions/workflows/Haskell-CI/badge.svg)](https://github.com/ekmett/adjunctions/actions?query=workflow%3AHaskell-CI)
 
 This package provides adjunctions for Haskell.
 
diff --git a/adjunctions.cabal b/adjunctions.cabal
--- a/adjunctions.cabal
+++ b/adjunctions.cabal
@@ -1,8 +1,8 @@
 name:          adjunctions
 category:      Data Structures, Adjunctions
-version:       4.4
+version:       4.4.1
 license:       BSD3
-cabal-version: >= 1.8
+cabal-version: >= 1.10
 license-file:  LICENSE
 author:        Edward A. Kmett
 maintainer:    Edward A. Kmett <ekmett@gmail.com>
@@ -15,10 +15,7 @@
 build-type:    Simple
 extra-source-files:
   .gitignore
-  .travis.yml
   .vim.custom
-  travis/cabal-apt-install
-  travis/config
   HLint.hs
   CHANGELOG.markdown
   README.markdown
@@ -28,7 +25,12 @@
              , GHC == 7.10.3
              , GHC == 8.0.2
              , GHC == 8.2.2
-             , GHC == 8.4.1
+             , GHC == 8.4.4
+             , GHC == 8.6.5
+             , GHC == 8.8.4
+             , GHC == 8.10.7
+             , GHC == 9.0.2
+             , GHC == 9.2.2
 
 source-repository head
   type: git
@@ -49,16 +51,16 @@
     array               >= 0.3.0.2 && < 0.7,
     base                >= 4       && < 5,
     comonad             >= 4       && < 6,
-    containers          >= 0.3     && < 0.6,
+    containers          >= 0.3     && < 0.7,
     contravariant       >= 1       && < 2,
     distributive        >= 0.5.1   && < 1,
     free                >= 4       && < 6,
-    mtl                 >= 2.0.1   && < 2.3,
+    mtl                 >= 2.0.1   && < 2.4,
     profunctors         >= 4       && < 6,
     tagged              >= 0.7     && < 1,
     semigroupoids       >= 4       && < 6,
     semigroups          >= 0.11    && < 1,
-    transformers        >= 0.2     && < 0.6,
+    transformers        >= 0.2     && < 0.7,
     transformers-compat >= 0.3     && < 1,
     void                >= 0.5.5.1 && < 1
 
@@ -80,10 +82,19 @@
 
   ghc-options: -Wall
 
-  -- See https://ghc.haskell.org/trac/ghc/wiki/Migration/8.0#base-4.9.0.0
+  default-language: Haskell2010
+
   if impl(ghc >= 8.0)
-    ghc-options: -Wcompat -Wnoncanonical-monad-instances -Wnoncanonical-monadfail-instances
+    -- See https://ghc.haskell.org/trac/ghc/wiki/Migration/8.0#base-4.9.0.0
+    ghc-options: -Wcompat -Wnoncanonical-monad-instances
+    ghc-options: -Wno-trustworthy-safe -Wno-inline-rule-shadowing
 
+    if !impl(ghc >= 8.8)
+      ghc-options: -Wnoncanonical-monadfail-instances
+
+  if impl(ghc >= 8.6)
+    ghc-options: -Wno-star-is-type
+
 test-suite spec
   type:           exitcode-stdio-1.0
   hs-source-dirs: tests
@@ -100,3 +111,4 @@
   other-modules: GenericsSpec
 
   ghc-options: -Wall -threaded -rtsopts
+  default-language: Haskell2010
diff --git a/src/Control/Comonad/Representable/Store.hs b/src/Control/Comonad/Representable/Store.hs
--- a/src/Control/Comonad/Representable/Store.hs
+++ b/src/Control/Comonad/Representable/Store.hs
@@ -1,5 +1,6 @@
 {-# LANGUAGE CPP #-}
 {-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE TypeOperators #-}
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
@@ -43,7 +44,9 @@
 import Data.Functor.Apply
 import Data.Functor.Extend
 import Data.Functor.Rep
+#if !(MIN_VERSION_base(4,11,0))
 import Data.Semigroup
+#endif
 
 -- | A memoized store comonad parameterized by a representable functor @g@, where
 -- the representatation of @g@, @Rep g@ is the index of the store.
@@ -58,8 +61,8 @@
       -> Store g a
 store = storeT . Identity
 
--- | Unwrap a state monad computation as a function.
--- (The inverse of 'state'.)
+-- | Unwrap a store comonad computation as a function and a current index.
+-- (The inverse of 'store'.)
 runStore :: Representable g
          => Store g a           -- ^ a store to access
          -> (Rep g -> a, Rep g) -- ^ initial state
diff --git a/src/Control/Monad/Representable/State.hs b/src/Control/Monad/Representable/State.hs
--- a/src/Control/Monad/Representable/State.hs
+++ b/src/Control/Monad/Representable/State.hs
@@ -1,5 +1,6 @@
 {-# LANGUAGE CPP #-}
 {-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE TypeOperators #-}
 {-# LANGUAGE TypeSynonymInstances #-}
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE FlexibleInstances #-}
diff --git a/src/Data/Functor/Adjunction.hs b/src/Data/Functor/Adjunction.hs
--- a/src/Data/Functor/Adjunction.hs
+++ b/src/Data/Functor/Adjunction.hs
@@ -181,7 +181,7 @@
 instance Adjunction m w =>
          Adjunction (WriterT s m) (TracedT s w) where
   unit   = TracedT . leftAdjunct (\ma s -> WriterT (fmap (\a -> (a, s)) ma))
-  counit = rightAdjunct (\(t, s) -> ($s) <$> runTracedT t) . runWriterT
+  counit = rightAdjunct (\(t, s) -> ($ s) <$> runTracedT t) . runWriterT
 
 instance (Adjunction f g, Adjunction f' g') =>
          Adjunction (Compose f' f) (Compose g g') where
diff --git a/src/Data/Functor/Contravariant/Rep.hs b/src/Data/Functor/Contravariant/Rep.hs
--- a/src/Data/Functor/Contravariant/Rep.hs
+++ b/src/Data/Functor/Contravariant/Rep.hs
@@ -24,7 +24,6 @@
   , contramapRep
   ) where
 
-import Control.Monad.Reader
 import Data.Functor.Contravariant
 import Data.Functor.Product
 import Data.Profunctor
diff --git a/src/Data/Functor/Rep.hs b/src/Data/Functor/Rep.hs
--- a/src/Data/Functor/Rep.hs
+++ b/src/Data/Functor/Rep.hs
@@ -86,13 +86,15 @@
 import Control.Comonad.Trans.Class
 import Control.Comonad.Trans.Traced
 import Control.Comonad.Cofree
+import Control.Monad.Fix (MonadFix(..))
 import Control.Monad.Trans.Identity
-import Control.Monad.Reader
+import Control.Monad.Reader (MonadReader(..), ReaderT(..))
 #if MIN_VERSION_base(4,4,0)
 import Data.Complex
 #endif
 import Data.Distributive
 import Data.Foldable (Foldable(fold))
+import Data.Function
 import Data.Functor.Bind
 import Data.Functor.Identity
 import Data.Functor.Compose
@@ -106,7 +108,9 @@
 import qualified Data.Sequence as Seq
 import Data.Semigroup hiding (Product)
 import Data.Tagged
+#if !(MIN_VERSION_base(4,8,0))
 import Data.Traversable (Traversable(sequenceA))
+#endif
 import Data.Void
 import GHC.Generics hiding (Rep)
 import Prelude hiding (lookup)
diff --git a/travis/cabal-apt-install b/travis/cabal-apt-install
deleted file mode 100644
--- a/travis/cabal-apt-install
+++ /dev/null
@@ -1,27 +0,0 @@
-#! /bin/bash
-set -eu
-
-APT="sudo apt-get -q -y"
-CABAL_INSTALL_DEPS="cabal install --only-dependencies --force-reinstall"
-
-$APT update
-$APT install dctrl-tools
-
-# Find potential system packages to satisfy cabal dependencies
-deps()
-{
-	local M='^\([^ ]\+\)-[0-9.]\+ (.*$'
-	local G=' -o ( -FPackage -X libghc-\L\1\E-dev )'
-	local E="$($CABAL_INSTALL_DEPS "$@" --dry-run -v 2> /dev/null \
-		| sed -ne "s/$M/$G/p" | sort -u)"
-	grep-aptavail -n -sPackage \( -FNone -X None \) $E | sort -u
-}
-
-$APT install $(deps "$@") libghc-quickcheck2-dev # QuickCheck is special
-$CABAL_INSTALL_DEPS "$@" # Install the rest via Hackage
-
-if ! $APT install hlint ; then
-	$APT install $(deps hlint)
-	cabal install hlint
-fi
-
diff --git a/travis/config b/travis/config
deleted file mode 100644
--- a/travis/config
+++ /dev/null
@@ -1,16 +0,0 @@
--- This provides a custom ~/.cabal/config file for use when hackage is down that should work on unix
---
--- This is particularly useful for travis-ci to get it to stop complaining
--- about a broken build when everything is still correct on our end.
---
--- This uses Luite Stegeman's mirror of hackage provided by his 'hdiff' site instead
---
--- To enable this, uncomment the before_script in .travis.yml
-
-remote-repo: hdiff.luite.com:http://hdiff.luite.com/packages/archive
-remote-repo-cache: ~/.cabal/packages
-world-file: ~/.cabal/world
-build-summary: ~/.cabal/logs/build.log
-remote-build-reporting: anonymous
-install-dirs user
-install-dirs global
