diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
--- a/.travis.yml
+++ /dev/null
@@ -1,2 +0,0 @@
-language: nix
-script: nix-build
diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,17 @@
 # Changelog for B9
 
+## 1.0.1
+
+* Remove dhall
+* Cleanup `b9.cabal`
+* Replace `fail` with `error`
+
+## 1.0.0
+
+* Add `SystemdNspawn` support
+* Improve command execution
+* Improve nix build expressions
+
 ## 0.5.69.0
 
 * Add new `ImageResize` option `ShrinkToMinimumAndIncrease`
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # B9 - A Benign VM-Build Tool [![changelog](https://img.shields.io/badge/changelog-green.svg?style=flat)](CHANGELOG.md)
 
-[![Build Status](https://travis-ci.org/sheyll/b9-vm-image-builder.svg?branch=0.5)](https://travis-ci.org/sheyll/b9-vm-image-builder) [![Hackage](https://img.shields.io/badge/hackage-B9-green.svg?style=flat)](http://hackage.haskell.org/package/b9)
+[![Build Status](https://travis-ci.org/sheyll/b9-vm-image-builder.svg)](https://travis-ci.org/sheyll/b9-vm-image-builder) [![Hackage](https://img.shields.io/badge/hackage-B9-green.svg?style=flat)](http://hackage.haskell.org/package/b9)
 
 **NOTE: The feature list is not completely implemented yet!**
 
@@ -74,11 +74,11 @@
 
 * systemd
 
-#### For `Podman` support
+#### For `Podman` support (TODO)
 
 * podman 
 
-#### For `Docker` support
+#### For `Docker` support (TODO)
 
 * docker 
 
@@ -177,7 +177,7 @@
 
 The input files can be in:
 
-* DHALL format
+* Dhall format **TODO**
 * Haskell values interpreted by the `Read` instances.
 
 ### Usage as Library 
diff --git a/b9.cabal b/b9.cabal
--- a/b9.cabal
+++ b/b9.cabal
@@ -1,6 +1,6 @@
 cabal-version:       2.4
 name:                b9
-version:             1.0.0
+version:             1.0.1
 
 synopsis:            A tool and library for building virtual machine images.
 
@@ -46,17 +46,11 @@
 maintainer:          svh@posteo.de
 homepage:            https://github.com/sheyll/b9-vm-image-builder
 bug-reports:         https://github.com/sheyll/b9-vm-image-builder/issues
-copyright:           2015, 2016, 2017, 2018, 2019 Sven Heyll <svh@posteo.de>
+copyright:           2015, 2016, 2017, 2018, 2019, 2020 Sven Heyll <svh@posteo.de>
 category:            Development
 build-type:          Simple
 extra-source-files:  README.md
-                   , LICENSE
-                   , Setup.hs
-                   , b9.cabal
                    , .gitignore
-                   , prepare_release.sh
-                   , stack.yaml
-                   , .travis.yml
                    , CONTRIBUTORS
                    , CONTRIBUTING.md
                    , CODE_OF_CONDUCT.md
@@ -165,7 +159,7 @@
                    , boxes >= 0.1.4
                    , conduit >= 1.2
                    , conduit-extra >= 1.1
-                   , dhall >= 1
+                   -- , dhall >= 1 TODO
                    , exceptions >= 0.10
                    , filepath >= 1.4
                    , free >= 4.12
diff --git a/prepare_release.sh b/prepare_release.sh
deleted file mode 100644
--- a/prepare_release.sh
+++ /dev/null
@@ -1,17 +0,0 @@
-#!/usr/bin/env bash
-#
-# Prepare B9 for release:
-# * clean the workspace
-# * install the dependencies
-# * check that the project compiles
-# * run all tests
-# * build documentation
-#
-set -eu
-
-stack clean
-stack build
-stack test
-stack haddock
-stack sdist
-
diff --git a/src/lib/B9/B9Config.hs b/src/lib/B9/B9Config.hs
--- a/src/lib/B9/B9Config.hs
+++ b/src/lib/B9/B9Config.hs
@@ -309,10 +309,10 @@
             putStrLn ("creating a new config file with defaults at: " ++ c)
             return c
           Nothing ->
-            fail "Please provide a valid config file path."
+            error "Please provide a valid config file path."
   cp <- openOrCreateB9Config cfgPath
   case parseB9Config cp of
-    Left e -> fail (printf "Internal configuration load error, please report this: %s\n" (show e))
+    Left e -> error (printf "Internal configuration load error, please report this: %s\n" (show e))
     Right permanentConfigIn -> do
       let runtimeCfg = appEndo (cfg ^. customB9Config) permanentConfigIn
       (res, permanentB9ConfigUpdates) <-
@@ -325,7 +325,7 @@
       cpExt <-
         maybe
           (return Nothing)
-          (either (fail . printf "Internal configuration update error! Please report this: %s\n" . show) (return . Just))
+          (either (error . printf "Internal configuration update error! Please report this: %s\n" . show) (return . Just))
           cpExtErr
       mapM_ (writeB9CPDocument (cfg ^. customB9ConfigPath)) cpExt
       return res
diff --git a/src/lib/B9/Shake/SharedImageRules.hs b/src/lib/B9/Shake/SharedImageRules.hs
--- a/src/lib/B9/Shake/SharedImageRules.hs
+++ b/src/lib/B9/Shake/SharedImageRules.hs
@@ -95,4 +95,4 @@
   deriving (Typeable)
 
 errorSharedImageNotFound :: (HasCallStack, Monad m) => SharedImageName -> m a
-errorSharedImageNotFound = fail . printf "Error: %s not found." . show
+errorSharedImageNotFound = error . printf "Error: %s not found." . show
diff --git a/src/tests/B9/Content/ErlTermsSpec.hs b/src/tests/B9/Content/ErlTermsSpec.hs
--- a/src/tests/B9/Content/ErlTermsSpec.hs
+++ b/src/tests/B9/Content/ErlTermsSpec.hs
@@ -61,8 +61,8 @@
               let decimalStr =
                     unsafeRenderToText (show (decimal :: Integer) ++ ".")
               parsedTerm <- case parseErlTerm "test" decimalStr of
-                (Left e) -> fail e
-                (Right parsedTerm) -> return parsedTerm
+                Left e -> error e
+                Right parsedTerm -> return parsedTerm
               return (ErlNatural decimal == parsedTerm)
           )
       )
diff --git a/stack.yaml b/stack.yaml
deleted file mode 100644
--- a/stack.yaml
+++ /dev/null
@@ -1,10 +0,0 @@
-flags: {}
-packages:
-- '.'
-extra-deps:
-- ConfigFile-1.1.4
-- template-0.2.0.10
-- extensible-effects-5.0.0.1
-
-resolver: lts-14.7
-require-stack-version: ">=1.6.5"