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 0.35.0.
+-- This file has been generated from package.yaml by hpack version 0.36.0.
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: a590a5b99480bbc59bde069ff1bb894b267187f99bc037518a7a80a5659b918f
+-- hash: 74ac50ea03705ee0fcdfc018fd96a1b7e08b2b56b59b24a805644b0cffbaab4a
 
 name:           betris
-version:        0.2.3.0
+version:        0.2.3.1
 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
@@ -41,7 +41,7 @@
       ansi-terminal
     , base >=4.9.0 && <5
     , containers >=0.5.7 && <0.7
-    , linear >=1.20.7 && <1.22
+    , linear >=1.20.7 && <1.23
     , microlens
     , microlens-th
     , optparse-applicative >=0.14.2 && <0.18
@@ -63,7 +63,7 @@
     , base >=4.9.0 && <5
     , betris
     , containers >=0.5.7 && <0.7
-    , linear >=1.20.7 && <1.22
+    , linear >=1.20.7 && <1.23
     , microlens
     , microlens-th
     , optparse-applicative >=0.14.2 && <0.18
diff --git a/src/Game/Tetris.hs b/src/Game/Tetris.hs
--- a/src/Game/Tetris.hs
+++ b/src/Game/Tetris.hs
@@ -21,14 +21,13 @@
 , board, shape, origin, score, block, coords, nextShape, initBlock
 ) where
 
-import           Data.Bool     (bool)
 import           Data.Map      (Map)
 import qualified Data.Map      as M
 import           Data.Maybe    (fromMaybe)
 import           Data.Monoid   (First (..))
 import           Data.Sequence (ViewL (..), ViewR (..), (<|), (><), (|>))
 import qualified Data.Sequence as Seq
-import           Lens.Micro    hiding ((:<), (:>), (<|), (|>))
+import           Lens.Micro
 import           Lens.Micro.TH (makeLenses)
 import           Linear.V2     (V2 (..), _x, _y)
 import qualified Linear.V2     as LV