diff --git a/app/Main.hs b/app/Main.hs
--- a/app/Main.hs
+++ b/app/Main.hs
@@ -2,7 +2,6 @@
 
 import qualified Command.Betris as Betris
 import Control.Monad (join)
-import Data.Semigroup ((<>))
 import Options.Applicative
 
 main :: IO ()
diff --git a/betris.cabal b/betris.cabal
--- a/betris.cabal
+++ b/betris.cabal
@@ -1,13 +1,13 @@
 cabal-version: 1.12
 
--- This file has been generated from package.yaml by hpack version 0.33.0.
+-- This file has been generated from package.yaml by hpack version 0.34.4.
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: c88ccbaf751536b4da160882aefe63b89cda6e9c7ea3ecb6837eadf5ec8a8453
+-- hash: 273304bd3d50cc8549848071abf1c6189bc8ce587d83c258ec2cc6943b51118b
 
 name:           betris
-version:        0.2.1.0
+version:        0.2.2.0
 synopsis:       A horizontal version of tetris for braille users
 description:    The game of tetris for braille display users, implemented using unicode braille rotated 90 degrees.  Tetriminos are "falling" from right to left.
 category:       Game
@@ -18,7 +18,8 @@
 copyright:      2020 Mario Lang
 license:        BSD3
 license-file:   LICENSE
-tested-with:    GHC == 8.0.1, GHC == 8.4.3
+tested-with:
+    GHC == 8.0.1, GHC == 8.4.3
 build-type:     Simple
 extra-source-files:
     README.md
@@ -38,15 +39,15 @@
   ghc-options: -Wall
   build-depends:
       ansi-terminal
-    , base >=4.9.0 && <4.15
+    , base >=4.9.0 && <4.16
     , containers >=0.5.7 && <0.7
-    , lens >=4.15.4 && <4.20
+    , lens >=4.15.4 && <5.1
     , linear >=1.20.7 && <1.22
-    , optparse-applicative >=0.14.2 && <0.16
-    , random >=1.1 && <1.2
+    , optparse-applicative >=0.14.2 && <0.17
+    , random >=1.1 && <1.3
     , stm >=2.4.5 && <2.6
     , time-units >=1.0.0 && <1.1
-    , vty >=5.21 && <5.33
+    , vty >=5.21 && <5.34
   default-language: Haskell2010
 
 executable betris
@@ -58,14 +59,14 @@
   ghc-options: -Wall -threaded -rtsopts -with-rtsopts=-N
   build-depends:
       ansi-terminal
-    , base >=4.9.0 && <4.15
+    , base >=4.9.0 && <4.16
     , betris
     , containers >=0.5.7 && <0.7
-    , lens >=4.15.4 && <4.20
+    , lens >=4.15.4 && <5.1
     , linear >=1.20.7 && <1.22
-    , optparse-applicative >=0.14.2 && <0.16
-    , random >=1.1 && <1.2
+    , optparse-applicative >=0.14.2 && <0.17
+    , random >=1.1 && <1.3
     , stm >=2.4.5 && <2.6
     , time-units >=1.0.0 && <1.1
-    , vty >=5.21 && <5.33
+    , vty >=5.21 && <5.34
   default-language: Haskell2010