diff --git a/brittany.cabal b/brittany.cabal
index 2cd732b..096538a 100644
--- a/brittany.cabal
+++ b/brittany.cabal
@@ -78,7 +78,7 @@ library {
     , bytestring >=0.10.8.1 && <0.11
     , directory >=1.2.6.2 && <1.3
     , lens
-    , butcher
+    , butcher >=0.2.0.0 && <0.3
     , yaml >=0.8.18 && <0.9
     , extra >=1.4.10 && <1.5
     , uniplate >=1.6.12 && <1.7
diff --git a/src-brittany/Main.hs b/src-brittany/Main.hs
index a8db774..1e16143 100644
--- a/src-brittany/Main.hs
+++ b/src-brittany/Main.hs
@@ -65,9 +65,9 @@ mainCmdParser = do
   reorderStart
   printHelp <- addSimpleBoolFlag "" ["help"] mempty
   printVersion <- addSimpleBoolFlag "" ["version"] mempty
-  inputPaths <- addFlagStringParam "i" ["input"] "PATH" (flagHelpStr "path to input haskell source file")
-  outputPaths <- addFlagStringParam "o" ["output"] "PATH" (flagHelpStr "output file path")
-  configPaths <- addFlagStringParam "" ["config-file"] "PATH" (flagHelpStr "path to config file") -- TODO: allow default on addFlagStringParam ?
+  inputPaths <- addFlagStringParams "i" ["input"] "PATH" (flagHelpStr "path to input haskell source file")
+  outputPaths <- addFlagStringParams "o" ["output"] "PATH" (flagHelpStr "output file path")
+  configPaths <- addFlagStringParams "" ["config-file"] "PATH" (flagHelpStr "path to config file") -- TODO: allow default on addFlagStringParam ?
   cmdlineConfig <- configParser
   suppressOutput <- addSimpleBoolFlag "" ["suppress-output"] (flagHelp $ parDoc "suppress the regular output, i.e. the transformed haskell source")
   _verbosity <- addSimpleCountFlag "v" ["verbose"] (flagHelp $ parDoc "[currently without effect; TODO]")
diff --git a/src/Language/Haskell/Brittany/Config.hs b/src/Language/Haskell/Brittany/Config.hs
index 90f7ff3..b281d9c 100644
--- a/src/Language/Haskell/Brittany/Config.hs
+++ b/src/Language/Haskell/Brittany/Config.hs
@@ -35,9 +35,9 @@ import           Data.Coerce ( Coercible, coerce )
 configParser :: CmdParser Identity out (ConfigF Option)
 configParser = do
   -- TODO: why does the default not trigger; ind never should be []!!
-  ind                <- addFlagReadParam "" ["indent"] "AMOUNT" (flagHelpStr "spaces per indentation level")
-  cols               <- addFlagReadParam "" ["columns"] "AMOUNT" (flagHelpStr "target max columns (80 is an old default for this)")
-  importCol          <- addFlagReadParam "" ["import-col"] "N" (flagHelpStr "column to align import lists at")
+  ind                <- addFlagReadParams "" ["indent"] "AMOUNT" (flagHelpStr "spaces per indentation level")
+  cols               <- addFlagReadParams "" ["columns"] "AMOUNT" (flagHelpStr "target max columns (80 is an old default for this)")
+  importCol          <- addFlagReadParams "" ["import-col"] "N" (flagHelpStr "column to align import lists at")
 
   dumpConfig         <- addSimpleBoolFlag "" ["dump-config"] (flagHelp $ parDoc "dump the programs full config (commandline + file + defaults)")
   dumpAnnotations    <- addSimpleBoolFlag "" ["dump-annotations"] (flagHelp $ parDoc "dump the full annotations returned by ghc-exactprint")
@@ -56,7 +56,7 @@ configParser = do
   outputOnErrors <- addSimpleBoolFlag "" ["output-on-errors"] (flagHelp $ parDoc "even when there are errors, produce output (or try to to the degree possible")
   wError             <- addSimpleBoolFlag "" ["werror"] (flagHelp $ parDoc "treat warnings as errors")
 
-  optionsGhc         <- addFlagStringParam
+  optionsGhc         <- addFlagStringParams
     ""
     ["ghc-options"]
     "STRING"
diff --git a/stack.yaml b/stack.yaml
index ad5b142..68b933f 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -7,7 +7,7 @@ packages:
 - .
 - extra-dep: true
   location:
-    commit: e0885a4f482c063862e38db7de4319f3786c7a28
+    commit: 8b721f7e17a20a338432f1d31ef55db5e50b8e8d
     git: https://github.com/lspitzner/butcher.git
 - extra-dep: true
   location: