diff --git a/fpco-api.cabal b/fpco-api.cabal
--- a/fpco-api.cabal
+++ b/fpco-api.cabal
@@ -1,5 +1,5 @@
 name:          fpco-api
-version:       1.2.0.1
+version:       1.2.0.2
 synopsis:      Simple interface to the FP Complete IDE API.
 description:   A server and library for communicating with the FP Complete IDE API.
 homepage:      https://www.fpcomplete.com/page/api
@@ -103,7 +103,7 @@
       , fpco-api
       , ini                  >= 0.2.0
       , network              >= 2.4
-      , optparse-applicative >= 0.5
+      , optparse-applicative >= 0.11
       , process              >= 1.1
       , safe                 >= 0.3
       , text                 >= 0.11
diff --git a/src/executables/Main.hs b/src/executables/Main.hs
--- a/src/executables/Main.hs
+++ b/src/executables/Main.hs
@@ -29,6 +29,7 @@
 import           Data.Text.Read
 import           Network
 import           Options.Applicative
+import           Options.Applicative.Types (readerAsk)
 import           Prelude hiding (catch)
 import           Safe
 import           System.Directory
@@ -134,34 +135,34 @@
 -- | PID option.
 fayPidOpt :: Parser ProjectId
 fayPidOpt =
-  argument (return . toFay)
+  argument (toFay <$> readerAsk)
    (metavar "PID")
 
 -- | PROJECT option.
 fayProjectOpt :: Parser (Either Text ProjectId)
 fayProjectOpt =
-  argument (return . toFayPid)
+  argument (toFayPid <$> readerAsk)
            (metavar "PROJECT" <>
             help "Either a project URL or a project ID")
 
 -- | ROOT option.
 rootOpt :: Parser FilePath
 rootOpt =
-  argument return
+  argument readerAsk
            (metavar "ROOT" <>
             help "Project root directory")
 
 -- | FILEPATH option.
 filepathOpt :: Parser FilePath
 filepathOpt =
-  argument return
+  argument readerAsk
            (metavar "FILEPATH" <>
             help "The file path")
 
 -- | TMPPATH option.
 tmppathOpt :: Parser FilePath
 tmppathOpt =
-  argument return
+  argument readerAsk
            (metavar "TMPPATH" <>
             help "The temporary file path containing the actual contents of the module")