diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+1.5.21
+
+* Build against `optparse-applicative-0.16.0.0`
+
 1.5.20
 
 * Build against `doctest-0.17`
diff --git a/src/Turtle/Options.hs b/src/Turtle/Options.hs
--- a/src/Turtle/Options.hs
+++ b/src/Turtle/Options.hs
@@ -284,7 +284,7 @@
     s <- Opts.readerAsk
     case f (Text.pack s) of
         Just a -> return a
-        Nothing -> Opts.readerAbort Opts.ShowHelpText
+        Nothing -> Opts.readerAbort (Opts.ShowHelpText Nothing)
 
 {-| Create a sub-command that parses `CommandName` and then parses the rest
     of the command-line arguments
diff --git a/turtle.cabal b/turtle.cabal
--- a/turtle.cabal
+++ b/turtle.cabal
@@ -1,5 +1,5 @@
 Name: turtle
-Version: 1.5.20
+Version: 1.5.21
 Cabal-Version: >=1.10
 Build-Type: Simple
 License: BSD3
@@ -68,7 +68,7 @@
         text                 >= 1.0.0   && < 1.3 ,
         time                               < 1.10,
         transformers         >= 0.2.0.0 && < 0.6 ,
-        optparse-applicative >= 0.13    && < 0.16,
+        optparse-applicative >= 0.16    && < 0.17,
         optional-args        >= 1.0     && < 2.0 ,
         unix-compat          >= 0.4     && < 0.6
     if os(windows)