diff --git a/pkgs/development/tools/dockfmt/default.nix b/pkgs/development/tools/dockfmt/default.nix
index d637b8ca3e5..18dfed5f2fb 100644
--- a/pkgs/development/tools/dockfmt/default.nix
+++ b/pkgs/development/tools/dockfmt/default.nix
@@ -5,13 +5,14 @@
 
 buildGoModule rec {
   pname = "dockfmt";
-  version = "0.3.3";
+  version = "unstable-2020-09-18";
 
+  # The latest released version doesn't support reading from stdin.
   src = fetchFromGitHub {
     owner = "jessfraz";
     repo = "dockfmt";
-    rev = "v${version}";
-    sha256 = "0m56ydmf7zbcsa5yym7j5fgr75v677h9s40zyzwrqccyq01myp06";
+    rev = "1455059b8bb53ab4723ef41946c43160583a8333";
+    hash = "sha256-wEC9kENcE3u+Mb7uLbx/VBUup6PBnCY5cxTYvkJcavg=";
   };
 
   vendorSha256 = null;
@@ -25,7 +26,7 @@ buildGoModule rec {
   meta = with lib; {
     description = "Dockerfile format";
     homepage = "https://github.com/jessfraz/dockfmt";
-    license = [ licenses.mit ];
-    maintainers = [ maintainers.cpcloud ];
+    license = licenses.mit;
+    maintainers = with maintainers; [ cpcloud ];
   };
 }