diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8988c1e..c410740 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,14 @@
+1.4.0
+
+* BREAKING CHANGE: Remove unnecessary `Maybe` from type of `single`
+* BREAKING CHANGE: Consolidate `searchable` and `executable`
+* `stream{,WithErr}` now throws an `ExitCode` on failure
+
+1.3.6
+
+* Build against `ghc-8.2`
+* Relax upper bound on `optparse-applicative` and `foldl`
+
 1.3.5
 
 * Increase upper bound on `foldl`
diff --git a/README.md b/README.md
index 1790e00..b2458c8 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# Turtle v1.3.6
+# Turtle v1.4.0
 
 Turtle is a reimplementation of the Unix command line environment in Haskell so
 that you can use Haskell as a scripting language or a shell.  Think of `turtle`
diff --git a/default.nix b/default.nix
index 925d56b..f3ce4b7 100644
--- a/default.nix
+++ b/default.nix
@@ -1,12 +1,12 @@
 { mkDerivation, ansi-wl-pprint, async, base, bytestring, clock
-, criterion, directory, doctest, foldl, hostname, managed
-, optional-args, optparse-applicative, process, semigroups, stdenv
-, stm, system-fileio, system-filepath, temporary, text, time
+, directory, doctest, foldl, hostname, managed, optional-args
+, optparse-applicative, process, semigroups, stdenv, stm
+, system-fileio, system-filepath, temporary, text, time
 , transformers, unix, unix-compat
 }:
 mkDerivation {
   pname = "turtle";
-  version = "1.3.6";
+  version = "1.4.0";
   src = ./.;
   libraryHaskellDepends = [
     ansi-wl-pprint async base bytestring clock directory foldl hostname
@@ -15,7 +15,6 @@ mkDerivation {
     unix-compat
   ];
   testHaskellDepends = [ base doctest system-filepath temporary ];
-  benchmarkHaskellDepends = [ base criterion text ];
   description = "Shell programming, Haskell-style";
   license = stdenv.lib.licenses.bsd3;
 }
diff --git a/turtle.cabal b/turtle.cabal
index d66b1ab..84f7882 100644
--- a/turtle.cabal
+++ b/turtle.cabal
@@ -1,5 +1,5 @@
 Name: turtle
-Version: 1.3.6
+Version: 1.4.0
 Cabal-Version: >=1.10
 Build-Type: Simple
 License: BSD3