diff --git a/pkgs/development/tools/flock/default.nix b/pkgs/development/tools/flock/default.nix
index a6ba410ec710..c9c71a9f8592 100644
--- a/pkgs/development/tools/flock/default.nix
+++ b/pkgs/development/tools/flock/default.nix
@@ -1,22 +1,30 @@
-{ stdenv, lib, fetchFromGitHub, autoreconfHook, ronn }:
+{ stdenv, lib, fetchFromGitHub, fetchpatch, autoreconfHook, ronn }:
 
 stdenv.mkDerivation rec {
   pname = "flock";
-  version = "0.2.3";
+  version = "0.4.0";
 
   src = fetchFromGitHub {
     owner = "discoteq";
     repo = pname;
     rev = "v${version}";
-    sha256 = "1vdq22zhdfi7wwndsd6s7fwmz02fsn0x04d7asq4hslk7bjxjjzn";
+    sha256 = "sha256-cCpckORtogs6Nt7c5q2+z0acXAnALdLV6uzxa5ng3s4=";
   };
 
   nativeBuildInputs = [ autoreconfHook ];
   buildInputs = [ ronn ];
 
+  patches = [
+    (fetchpatch {
+      name = "fix-format-specifier.patch";
+      url = "https://github.com/discoteq/flock/commit/408bad42eb8d76cdd0c504c2f97f21c0b424c3b1.patch";
+      sha256 = "sha256-YuFKXWTBu9A2kBNqkg1Oek6vDbVo/y8dB1k9Fuh3QmA";
+    })
+  ];
+
   meta = with lib; {
     description = "Cross-platform version of flock(1)";
-    maintainers = [ maintainers.matthewbauer ];
+    maintainers = with maintainers; [ matthewbauer msfjarvis ];
     platforms = platforms.all;
     license = licenses.isc;
   };