diff --git a/.gitignore b/.gitignore
index 49d3d54..2ded37a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,7 +14,6 @@
 *.lz
 *.pk3
 *.run
-*.Z
 *.deb
 *.jar
 *~
@@ -26,3 +25,4 @@
 /vendor/
 /.bundle/
 /pkg/
+/dist-newstyle/
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..6e8504c
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,5 @@
+# Revision history for slackbuilder
+
+## 0.1.0.0 -- YYYY-mm-dd
+
+* First version. Released on an unsuspecting world.
diff --git a/app/Main.hs b/app/Main.hs
new file mode 100644
index 0000000..75a4396
--- /dev/null
+++ b/app/Main.hs
@@ -0,0 +1,46 @@
+module Main
+    ( main
+    ) where
+
+import Data.Aeson.TH (defaultOptions, deriveJSON)
+import Data.HashMap.Strict (HashMap)
+import qualified Data.HashMap.Strict as HashMap
+import Data.Text (Text)
+import qualified Data.Text.IO as Text.IO
+import Data.Vector (Vector)
+import qualified Data.Vector as Vector
+import Network.HTTP.Req
+    ( runReq
+    , defaultHttpConfig
+    , req
+    , GET(..)
+    , https
+    , jsonResponse
+    , NoReqBody(..)
+    , (/:)
+    , responseBody
+    )
+import Data.Maybe (fromMaybe)
+
+newtype PackagistPackage = PackagistPackage
+    { version :: Text
+    } deriving (Eq, Show)
+
+$(deriveJSON defaultOptions ''PackagistPackage)
+
+newtype PackagistResponse = PackagistResponse
+    { packages :: HashMap Text (Vector PackagistPackage)
+    } deriving (Eq, Show)
+
+$(deriveJSON defaultOptions ''PackagistResponse)
+
+main :: IO ()
+main = do
+    packagistResponse <- runReq defaultHttpConfig $
+        let uri = https "repo.packagist.org" /: "p2" /: "composer" /: "composer.json"
+         in req GET uri NoReqBody jsonResponse mempty
+    let packagistPackages = packages $ responseBody packagistResponse
+
+    Text.IO.putStrLn $ fromMaybe ""
+        $ HashMap.lookup "composer/composer" packagistPackages
+        >>= fmap (version . fst) . Vector.uncons
diff --git a/lib/up2date.rb b/lib/up2date.rb
index 3387941..322cb9c 100644
--- a/lib/up2date.rb
+++ b/lib/up2date.rb
@@ -77,12 +77,7 @@ module SlackBuilder
     end
 
     def latest
-      full_name = [@vendor, @name].join '/'
-      uri = URI "https://repo.packagist.org/p2/#{full_name}.json"
-      response = Net::HTTP.get uri, {
-        'content-type' => 'application/json'
-      }
-      JSON.parse(response)['packages'][full_name].first['version']
+      `./bin/slackbuilder #{@vendor} #{@name}`.strip
     end
   end
 
diff --git a/slackbuilder.cabal b/slackbuilder.cabal
new file mode 100644
index 0000000..66418de
--- /dev/null
+++ b/slackbuilder.cabal
@@ -0,0 +1,40 @@
+cabal-version:      2.4
+name:               slackbuilder
+version:            0.1.0.0
+
+-- A short (one-line) description of the package.
+-- synopsis:
+
+-- A longer description of the package.
+-- description:
+
+bug-reports: https://git.caraus.tech/OSS/slackbuilder/issues
+
+license: MPL-2.0
+license-files: LICENSE
+copyright: (c) 2023 Eugen Wissner
+
+author: Eugen Wissner
+maintainer: belka@caraus.de
+
+category: Build
+extra-source-files: CHANGELOG.md
+
+executable slackbuilder
+    main-is:          Main.hs
+
+    -- Modules included in this executable, other than Main.
+    -- other-modules:
+
+    default-extensions:
+        OverloadedStrings
+        TemplateHaskell
+    build-depends:
+        aeson ^>= 2.2.0,
+        base ^>= 4.16.4.0,
+        req ^>=3.13,
+        text ^>= 2.0,
+        unordered-containers ^>= 0.2.19,
+        vector ^>= 0.13.0
+    hs-source-dirs:   app
+    default-language: Haskell2010