diff --git a/qr-imager.cabal b/qr-imager.cabal
--- a/qr-imager.cabal
+++ b/qr-imager.cabal
@@ -1,59 +1,66 @@
-name:                qr-imager
-version:             0.2.1.1
-synopsis:            Library to generate QR codes from bytestrings and objects
-description:         Please see README.md
-homepage:            https://github.com/vmchale/QRImager#readme
-license:             BSD3
-license-file:        LICENSE
-author:              Vanessa McHale
-maintainer:          tmchale@wisc.edu
-copyright:           Copyright: (c) 2016 Vanessa McHale
-category:            Data
-build-type:          Simple
-stability:           stable
-extra-source-files:  README.md
-cabal-version:       >=1.10
+name: qr-imager
+version: 0.2.1.2
+cabal-version: >=1.10
+build-type: Simple
+license: BSD3
+license-file: LICENSE
+copyright: Copyright: (c) 2016 Vanessa McHale
+maintainer: tmchale@wisc.edu
+stability: stable
+homepage: https://github.com/vmchale/QRImager#readme
+synopsis: Library to generate QR codes from bytestrings and objects
+description:
+    Please see README.md
+category: Data
+author: Vanessa McHale
+extra-source-files:
+    README.md
 
+source-repository head
+    type: git
+    location: https://github.com/vmchale/QRImager
+
 library
-  hs-source-dirs:      src
-  exposed-modules:     Data.QRCodes
-                     , Data.QRCodes.Exe
-                     , Data.QRCodes.Image
-                     , Data.QRCodes.Signature
-  other-modules:       Data.QRCodes.Utils
-  build-depends:       base >= 4.7 && < 5
-                     , aeson
-                     , JuicyPixels
-                     , vector
-                     , bytestring
-                     , lens
-                     , cryptonite
-                     , jose-jwt
-                     , directory
-                     , haskell-qrencode
-                     , process
-                     , MissingH
-                     , optparse-applicative
-  default-language:    Haskell2010
+    exposed-modules:
+        Data.QRCodes
+        Data.QRCodes.Exe
+        Data.QRCodes.Image
+        Data.QRCodes.Signature
+    build-depends:
+        base >=4.7 && <5,
+        aeson >=0.11.2.1 && <0.12,
+        JuicyPixels >=3.2.8 && <3.3,
+        vector >=0.11.0.0 && <0.12,
+        bytestring >=0.10.8.1 && <0.11,
+        lens ==4.14.*,
+        cryptonite ==0.19.*,
+        jose-jwt >=0.7.3 && <0.8,
+        directory >=1.2.6.2 && <1.3,
+        haskell-qrencode >=1.0.4 && <1.1,
+        process >=1.4.2.0 && <1.5,
+        MissingH >=1.4.0.1 && <1.5,
+        optparse-applicative >=0.12.1.0 && <0.13
+    default-language: Haskell2010
+    hs-source-dirs: src
+    other-modules:
+        Data.QRCodes.Utils
 
 executable qrpipe
-  hs-source-dirs:      app
-  main-is:             Main.hs
-  ghc-options:         -threaded -rtsopts -with-rtsopts=-N
-  build-depends:       base
-                     , qr-imager
-  default-language:    Haskell2010
+    main-is: Main.hs
+    build-depends:
+        base >=4.9.0.0 && <4.10,
+        qr-imager >=0.2.1.2 && <0.3
+    default-language: Haskell2010
+    hs-source-dirs: app
+    ghc-options: -threaded -rtsopts -with-rtsopts=-N
 
 test-suite test-lib
-  type:                exitcode-stdio-1.0
-  hs-source-dirs:      test
-  main-is:             Spec.hs
-  ghc-options:         -threaded -rtsopts -with-rtsopts=-N
-  build-depends:       base
-                     , qr-imager
-                     , process
-  default-language:    Haskell2010
-
-source-repository head
-  type:     git
-  location: https://github.com/vmchale/QRImager
+    type: exitcode-stdio-1.0
+    main-is: Spec.hs
+    build-depends:
+        base >=4.9.0.0 && <4.10,
+        qr-imager >=0.2.1.2 && <0.3,
+        process >=1.4.2.0 && <1.5
+    default-language: Haskell2010
+    hs-source-dirs: test
+    ghc-options: -threaded -rtsopts -with-rtsopts=-N
diff --git a/src/Data/QRCodes/Image.hs b/src/Data/QRCodes/Image.hs
--- a/src/Data/QRCodes/Image.hs
+++ b/src/Data/QRCodes/Image.hs
@@ -47,7 +47,7 @@
 bsToImg :: BS.ByteString -> IO (T.Image Word8)
 bsToImg input = do
     smallMatrix <- toMatrix <$> encodeByteString input Nothing QR_ECLEVEL_H QR_MODE_EIGHT False
-    let qrMatrix = fattenList 8 $ map (fattenList 8) smallMatrix
+    let qrMatrix = fattenList 8 $ map (fattenList 8) smallMatrix --consider using repa here, with the `onImg` thing with JuicyPixels
     pure $ encodePng qrMatrix
 
 -- | Encode an object as a JuicyPixels `Image`