diff --git a/hs/ChangeLog.md b/hs/ChangeLog.md
deleted file mode 100644
index 42ad897..0000000
--- a/hs/ChangeLog.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# Changelog for hs
-
-## Unreleased changes
diff --git a/hs/README.md b/hs/README.md
deleted file mode 100644
index 20f1eac..0000000
--- a/hs/README.md
+++ /dev/null
@@ -1 +0,0 @@
-# hs
diff --git a/hs/package.yaml b/hs/package.yaml
index b83a802..40a6c32 100644
--- a/hs/package.yaml
+++ b/hs/package.yaml
@@ -1,23 +1,5 @@
 name:                hs
 version:             0.1.0.0
-github:              "githubuser/hs"
-license:             BSD3
-author:              "Author name here"
-maintainer:          "example@example.com"
-copyright:           "2019 Author name here"
-
-extra-source-files:
-- README.md
-- ChangeLog.md
-
-# Metadata used when publishing your package
-# synopsis:            Short description of your package
-# category:            Web
-
-# To avoid duplicated efforts in documentation and dealing with the
-# complications of embedding Haddock markup inside cabal files, it is
-# common to point users to the README.md file.
-description:         Please see the README on GitHub at <https://github.com/githubuser/hs#readme>
 
 dependencies:
 - base >= 4.7 && < 5
@@ -28,19 +10,8 @@ library:
 
 executables:
   aoc-hs:
-    main:                Main.hs
-    source-dirs:         app
-    ghc-options:
-    - -threaded
-    - -rtsopts
-    - -with-rtsopts=-N
-    dependencies:
-    - hs
-
-tests:
-  hs-test:
-    main:                Spec.hs
-    source-dirs:         test
+    main: Main.hs
+    source-dirs: app
     ghc-options:
     - -threaded
     - -rtsopts
diff --git a/hs/stack.yaml b/hs/stack.yaml
index dbba8d7..62b6b3b 100644
--- a/hs/stack.yaml
+++ b/hs/stack.yaml
@@ -1,66 +1,3 @@
-# This file was automatically generated by 'stack init'
-#
-# Some commonly used options have been documented as comments in this file.
-# For advanced use and comprehensive documentation of the format, please see:
-# https://docs.haskellstack.org/en/stable/yaml_configuration/
-
-# Resolver to choose a 'specific' stackage snapshot or a compiler version.
-# A snapshot resolver dictates the compiler version and the set of packages
-# to be used for project dependencies. For example:
-#
-# resolver: lts-3.5
-# resolver: nightly-2015-09-21
-# resolver: ghc-7.10.2
-#
-# The location of a snapshot can be provided as a file or url. Stack assumes
-# a snapshot provided as a file might change, whereas a url resource does not.
-#
-# resolver: ./custom-snapshot.yaml
-# resolver: https://example.com/snapshots/2018-01-01.yaml
-resolver: lts-14.16
-
-# User packages to be built.
-# Various formats can be used as shown in the example below.
-#
-# packages:
-# - some-directory
-# - https://example.com/foo/bar/baz-0.0.2.tar.gz
-#   subdirs:
-#   - auto-update
-#   - wai
+resolver: lts-16.20
 packages:
 - .
-# Dependency packages to be pulled from upstream that are not in the resolver.
-# These entries can reference officially published versions as well as
-# forks / in-progress versions pinned to a git hash. For example:
-#
-# extra-deps:
-# - acme-missiles-0.3
-# - git: https://github.com/commercialhaskell/stack.git
-#   commit: e7b331f14bcffb8367cd58fbfc8b40ec7642100a
-#
-# extra-deps: []
-
-# Override default flag values for local packages and extra-deps
-# flags: {}
-
-# Extra package databases containing global packages
-# extra-package-dbs: []
-
-# Control whether we use the GHC we find on the path
-# system-ghc: true
-#
-# Require a specific version of stack, using version ranges
-# require-stack-version: -any # Default
-# require-stack-version: ">=2.1"
-#
-# Override the architecture used by stack, especially useful on Windows
-# arch: i386
-# arch: x86_64
-#
-# Extra directories used by stack for building
-# extra-include-dirs: [/path/to/dir]
-# extra-lib-dirs: [/path/to/dir]
-#
-# Allow a newer minor version of GHC than the snapshot specifies
-# compiler-check: newer-minor
diff --git a/hs/stack.yaml.lock b/hs/stack.yaml.lock
index 5e17e80..032c6e2 100644
--- a/hs/stack.yaml.lock
+++ b/hs/stack.yaml.lock
@@ -6,7 +6,7 @@
 packages: []
 snapshots:
 - completed:
-    size: 524804
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/14/16.yaml
-    sha256: 4d1519a4372d051d47a5eae2241cf3fb54e113d7475f89707ddb6ec06add2888
-  original: lts-14.16
+    size: 532177
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/16/20.yaml
+    sha256: 0e14ba5603f01e8496e8984fd84b545a012ca723f51a098c6c9d3694e404dc6d
+  original: lts-16.20
diff --git a/hs/test/Spec.hs b/hs/test/Spec.hs
deleted file mode 100644
index cd4753f..0000000
--- a/hs/test/Spec.hs
+++ /dev/null
@@ -1,2 +0,0 @@
-main :: IO ()
-main = putStrLn "Test suite not yet implemented"