diff --git a/cabal-flatpak.cabal b/cabal-flatpak.cabal
--- a/cabal-flatpak.cabal
+++ b/cabal-flatpak.cabal
@@ -1,11 +1,11 @@
 Cabal-Version:  2.2
 Name:           cabal-flatpak
-Version:        0.1.0.2
+Version:        0.1.0.3
 License:        BSD-3-Clause
 License-File:   LICENSE
 Author:         Henning Thielemann <haskell@henning-thielemann.de>
 Maintainer:     Henning Thielemann <haskell@henning-thielemann.de>
-Homepage:       http://hub.darcs.net/thielema/cabal-flatpak/
+Homepage:       https://hub.darcs.net/thielema/cabal-flatpak/
 Category:       Distribution
 Synopsis:       Generate a FlatPak manifest from a Cabal package description
 Description:
@@ -25,13 +25,13 @@
   flatpak.cabal.json
 
 Source-Repository this
-  Tag:         0.1.0.2
+  Tag:         0.1.0.3
   Type:        darcs
-  Location:    http://hub.darcs.net/thielema/cabal-flatpak/
+  Location:    https://hub.darcs.net/thielema/cabal-flatpak/
 
 Source-Repository head
   Type:        darcs
-  Location:    http://hub.darcs.net/thielema/cabal-flatpak/
+  Location:    https://hub.darcs.net/thielema/cabal-flatpak/
 
 Executable cabal-flatpak
   Build-Depends:
@@ -40,15 +40,15 @@
     zlib >=0.5.3 && <0.7,
     tar >=0.5.0.3 && <0.6,
     http-client-tls >=0.3.5.3 && <0.4,
-    http-client >=0.5.12 && <0.7,
+    http-client >=0.5.12 && <0.8,
     http-types >=0.10 && <0.13,
     aeson-pretty >=0.8.7 && <0.9,
-    aeson >=1.2 && <1.6,
+    aeson >=2.0 && <2.1,
     shell-utility >=0.1 && <0.2,
-    optparse-applicative >=0.11 && <0.16,
+    optparse-applicative >=0.11 && <0.17,
     pathtype >=0.8 && <0.9,
     text >=1.2 && <1.3,
-    bytestring >=0.9 && <0.11,
+    bytestring >=0.9 && <0.12,
     containers >=0.5 && <0.7,
     utility-ht >=0.0.12 && <0.1,
     base >=4.5 && <5
diff --git a/src/Flatpak.hs b/src/Flatpak.hs
--- a/src/Flatpak.hs
+++ b/src/Flatpak.hs
@@ -9,6 +9,7 @@
 
 import qualified Cabal.Plan as Plan
 
+import qualified Data.Aeson.Key as Key
 import qualified Data.Aeson as Json
 import qualified Data.Text as Text
 import qualified Data.Monoid.HT as Mn
@@ -26,10 +27,10 @@
 infixr 8 .:, .:?, .:*
 
 (.:) :: FromJSON a => Json.Object -> String -> Parser a
-o .: field  =  o Json..: Text.pack field
+o .: field  =  o Json..: Key.fromString field
 
 (.:?) :: FromJSON a => Json.Object -> (String, a) -> Parser a
-o .:? (field, deflt)  =  o Json..:? Text.pack field Json..!= deflt
+o .:? (field, deflt)  =  o Json..:? Key.fromString field Json..!= deflt
 
 (.:*) :: FromJSON a => Json.Object -> String -> Parser [a]
 o .:* field  =  o .:? (field, [])
@@ -38,7 +39,7 @@
 infixr 8 .=, .=?, .=*
 
 (.=) :: ToJSON a => String -> (object -> a) -> object -> [Pair]
-(field .= a) obj  =  [Text.pack field Json..= a obj]
+(field .= a) obj  =  [Key.fromString field Json..= a obj]
 
 (.=?) :: (ToJSON a, Eq a) => String -> (object -> a, a) -> object -> [Pair]
 (field .=? (a, deflt)) obj  =  Mn.when (a obj /= deflt) ((field .= a) obj)
@@ -72,7 +73,7 @@
 pairsFromSourceType :: SourceType -> [Pair]
 pairsFromSourceType t =
    let simple str = [("type", Json.toJSON str)]
-   in map (mapFst Text.pack) $
+   in map (mapFst Key.fromString) $
       case t of
          Archive {stripComponents = strip} ->
             simple "archive" ++