diff --git a/pkgs/development/tools/comby/default.nix b/pkgs/development/tools/comby/default.nix
index 9b77740979e5..cd3251841ad1 100644
--- a/pkgs/development/tools/comby/default.nix
+++ b/pkgs/development/tools/comby/default.nix
@@ -14,7 +14,7 @@ let
   mkCombyPackage = { pname, extraBuildInputs ? [ ], extraNativeInputs ? [ ], preBuild ? "" }:
     ocamlPackages.buildDunePackage rec {
       inherit pname preBuild;
-      version = "1.7.0";
+      version = "1.7.1";
       useDune2 = true;
       minimumOcamlVersion = "4.08.1";
       doCheck = true;
@@ -23,7 +23,7 @@ let
         owner = "comby-tools";
         repo = "comby";
         rev = version;
-        sha256 = "sha256-Y2RcYvJOSqppmxxG8IZ5GlFkXCOIQU+1jJZ6j+PBHC4";
+        sha256 = "0k60hj8wcrvrk0isr210vnalylkd63ria1kgz5n49inl7w1hfwpv";
       };
 
       nativeBuildInputs = [
@@ -82,6 +82,7 @@ mkCombyPackage {
     ocamlPackages.parany
     ocamlPackages.conduit-lwt-unix
     ocamlPackages.lwt_react
+    ocamlPackages.tar-unix
     ocamlPackages.tls
     combyKernel
     combySemantic