diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+## 0.4.3.0
+### Added
+* Add support for GHC 9.0
+* Docker image is built on a newer compiler, cabal and alpine version
+### Removed
+* Official support for GHC versions older than 8.6
+
 ## 0.4.2.0
 ### Added
 * Add support for working directory
diff --git a/Dockerfile b/Dockerfile
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Build Hapistrano
-FROM alpine:3.9 as build-env
+FROM alpine:3.13 as build-env
 
 MAINTAINER Nicolas Vivar <nvivar@stackbuilders.com>
 
@@ -22,10 +22,6 @@
 WORKDIR /hapistrano
 
 COPY hapistrano.cabal .
-
-RUN cabal update
-RUN cabal install --only-dependencies
-
 COPY src/ src/
 COPY app/ app/
 COPY script/ script/
@@ -33,15 +29,25 @@
 COPY Setup.hs .
 # So Hapistrano is built with version information
 COPY .git/ .git/
+# Cabal has changed behaviour and it requires all modules listed
+COPY spec/ spec/
+COPY fixtures/ fixtures/
+COPY CHANGELOG.md .
+COPY README.md .
+RUN touch Dockerfile
 
+RUN cabal update
+RUN cabal install --only-dependencies
 RUN cabal configure -f static
 RUN cabal build hap
 
 # Compress the resulting binary
-RUN upx /hapistrano/dist/build/hap/hap
+RUN mkdir bin
+RUN cp /hapistrano/dist-newstyle/build/x86_64-linux/ghc-8.8.4/hapistrano-0.4.3.0/x/hap/build/hap/hap bin/
+RUN upx /hapistrano/bin/hap
 
 # Copy Hapistrano to a basic Alpine with SSH
-FROM alpine:3.9
+FROM alpine:3.13
 
 RUN apk update \
  && apk add \
@@ -51,6 +57,6 @@
 
 RUN mkdir ~/.ssh
 
-COPY --from=build-env /hapistrano/dist/build/hap/hap /bin/hap
+COPY --from=build-env /hapistrano/bin/hap /bin/hap
 
 ENTRYPOINT ["/bin/hap"]
diff --git a/app/Main.hs b/app/Main.hs
--- a/app/Main.hs
+++ b/app/Main.hs
@@ -1,13 +1,17 @@
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE RecordWildCards   #-}
 {-# LANGUAGE TemplateHaskell   #-}
+{-# LANGUAGE CPP               #-}
 
 module Main (main) where
 
 import           Control.Concurrent.Async
 import           Control.Concurrent.STM
 import           Control.Monad
+
+#if !MIN_VERSION_base(4,13,0)
 import           Data.Monoid                ((<>))
+#endif
 import           Data.Version               (showVersion)
 import qualified Data.Yaml.Config           as Yaml
 import           Development.GitRev
diff --git a/hapistrano.cabal b/hapistrano.cabal
--- a/hapistrano.cabal
+++ b/hapistrano.cabal
@@ -1,5 +1,5 @@
 name:                hapistrano
-version:             0.4.2.0
+version:             0.4.3.0
 synopsis:            A deployment library for Haskell applications
 description:
   .
@@ -28,7 +28,7 @@
 bug-reports:         https://github.com/stackbuilders/hapistrano/issues
 build-type:          Simple
 cabal-version:       >=1.18
-tested-with:         GHC==8.0.2, GHC==8.2.2, GHC==8.4.4, GHC==8.6.5, GHC==8.8.3, GHC==8.10.1
+tested-with:         GHC==8.6.5, GHC==8.8.4, GHC==8.10.4, GHC==9.0.1
 extra-source-files:  CHANGELOG.md
                    , README.md
                    , Dockerfile
diff --git a/spec/System/HapistranoConfigSpec.hs b/spec/System/HapistranoConfigSpec.hs
--- a/spec/System/HapistranoConfigSpec.hs
+++ b/spec/System/HapistranoConfigSpec.hs
@@ -1,4 +1,6 @@
+{-# LANGUAGE CPP             #-}
 {-# LANGUAGE TemplateHaskell #-}
+
 module System.HapistranoConfigSpec
   ( spec
   ) where
@@ -8,7 +10,11 @@
                                            Source (..), TargetSystem (..))
 
 import qualified Data.Yaml.Config         as Yaml
+#if MIN_VERSION_base(4,15,0)
+import           Path                     (mkAbsDir)
+#else
 import           Path                     (mkAbsDir, Abs, Dir)
+#endif
 import           Test.Hspec
 
 
diff --git a/spec/System/HapistranoSpec.hs b/spec/System/HapistranoSpec.hs
--- a/spec/System/HapistranoSpec.hs
+++ b/spec/System/HapistranoSpec.hs
@@ -7,12 +7,14 @@
 
 import Control.Monad
 import Control.Monad.Reader
-import Data.Char (isSpace)
 import Data.List (isPrefixOf)
 import Data.Maybe (mapMaybe)
 import Numeric.Natural
 import Path
+#if !MIN_VERSION_base(4,13,0)
 import Path.Internal (Path(..))
+#endif
+
 import Path.IO
 import System.Directory (getCurrentDirectory, listDirectory)
 import qualified System.Hapistrano as Hap
diff --git a/src/System/Hapistrano.hs b/src/System/Hapistrano.hs
--- a/src/System/Hapistrano.hs
+++ b/src/System/Hapistrano.hs
@@ -65,7 +65,7 @@
       cloneToRelease taskDeployPath release
       setReleaseRevision taskDeployPath release gitRepositoryRevision
       return release
-    pushReleaseForRepository LocalDirectory {..} =
+    pushReleaseForRepository LocalDirectory {} =
       newRelease taskReleaseFormat
 
 -- | Same as 'pushRelease' but doesn't perform any version control
diff --git a/src/System/Hapistrano/Commands/Internal.hs b/src/System/Hapistrano/Commands/Internal.hs
--- a/src/System/Hapistrano/Commands/Internal.hs
+++ b/src/System/Hapistrano/Commands/Internal.hs
@@ -13,11 +13,15 @@
 {-# LANGUAGE GADTs               #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TypeFamilies        #-}
+{-# LANGUAGE CPP                 #-}
 
 module System.Hapistrano.Commands.Internal where
 
 import           Control.Monad.IO.Class
 import           Data.Char               (isSpace)
+#if MIN_VERSION_base(4,15,0)
+import           Data.Kind               (Type)
+#endif
 import           Data.List               (dropWhileEnd)
 import           Data.Maybe              (catMaybes, fromJust, mapMaybe)
 import           Data.Proxy
@@ -31,7 +35,11 @@
 -- | Class for data types that represent shell commands in typed way.
 class Command a where
   -- | Type of result.
+#if MIN_VERSION_base(4,15,0)
+  type Result a :: Type
+#else
   type Result a :: *
+#endif
   -- | How to render the command before feeding it into shell (possibly via
   -- SSH).
   renderCommand :: a -> String
diff --git a/src/System/Hapistrano/Config.hs b/src/System/Hapistrano/Config.hs
--- a/src/System/Hapistrano/Config.hs
+++ b/src/System/Hapistrano/Config.hs
@@ -95,7 +95,7 @@
         <*> grabPort m
         <*> grabShell m
         <*> grabSshArgs m)
-    let first Target{..} = host
+    let first Target{} = host
         configHosts = nubBy ((==) `on` first)
           (maybeToList (Target <$> host <*> pure port <*> pure shell <*> pure sshArgs) ++ hs)
         source m =