diff --git a/pkgs/development/interpreters/gauche/boot.nix b/pkgs/development/interpreters/gauche/boot.nix
index 61c67b13f78f..497ebba15557 100644
--- a/pkgs/development/interpreters/gauche/boot.nix
+++ b/pkgs/development/interpreters/gauche/boot.nix
@@ -1,18 +1,41 @@
-{ stdenv, lib, fetchurl, pkg-config, texinfo, libiconv, gdbm, openssl, zlib
-, mbedtls, cacert }:
+{
+  stdenv,
+  lib,
+  fetchurl,
+  pkg-config,
+  texinfo,
+  libiconv,
+  gdbm,
+  openssl,
+  zlib,
+  mbedtls,
+  cacert,
+}:
 
 stdenv.mkDerivation rec {
   pname = "gauche-bootstrap";
-  version = "0.9.12";
+  version = "0.9.15";
 
   src = fetchurl {
-    url = "https://github.com/shirok/Gauche/releases/download/release${lib.replaceStrings ["."] ["_"] version}/Gauche-${version}.tgz";
-    hash = "sha256-tK5kkhsHqWZhaV69WqwN7IE9GmjlRqYWCRE9eEP1thc=";
+    url = "https://github.com/shirok/Gauche/releases/download/release${
+      lib.replaceStrings [ "." ] [ "_" ] version
+    }/Gauche-${version}.tgz";
+    hash = "sha256-NkPie8fIgiz9b7KJLbGF9ljo42STi8LM/O2yOeNa94M=";
   };
 
-  nativeBuildInputs = [ pkg-config texinfo ];
+  nativeBuildInputs = [
+    pkg-config
+    texinfo
+  ];
 
-  buildInputs = [ libiconv gdbm openssl zlib mbedtls cacert ];
+  buildInputs = [
+    libiconv
+    gdbm
+    openssl
+    zlib
+    mbedtls
+    cacert
+  ];
 
   postPatch = ''
     patchShebangs .
@@ -34,8 +57,9 @@ stdenv.mkDerivation rec {
   doCheck = false;
 
   meta = with lib; {
-    description = "R7RS Scheme scripting engine";
+    description = "R7RS Scheme scripting engine (released version)";
     homepage = "https://practical-scheme.net/gauche/";
+    mainProgram = "gosh";
     maintainers = with maintainers; [ mnacamura ];
     license = licenses.bsd3;
     platforms = platforms.unix;
diff --git a/pkgs/development/interpreters/gauche/default.nix b/pkgs/development/interpreters/gauche/default.nix
index d596455fe015..62903de6bb8b 100644
--- a/pkgs/development/interpreters/gauche/default.nix
+++ b/pkgs/development/interpreters/gauche/default.nix
@@ -1,20 +1,46 @@
-{ stdenv, lib, fetchFromGitHub, autoreconfHook, gaucheBootstrap, pkg-config, texinfo
-, libiconv, gdbm, openssl, zlib, mbedtls, cacert, CoreServices }:
+{
+  stdenv,
+  lib,
+  fetchFromGitHub,
+  autoreconfHook,
+  gaucheBootstrap,
+  pkg-config,
+  texinfo,
+  libiconv,
+  gdbm,
+  openssl,
+  zlib,
+  mbedtls,
+  cacert,
+  CoreServices,
+}:
 
 stdenv.mkDerivation rec {
   pname = "gauche";
-  version = "0.9.13";
+  version = "0.9.15";
 
   src = fetchFromGitHub {
     owner = "shirok";
     repo = pname;
     rev = "release${lib.replaceStrings [ "." ] [ "_" ] version}";
-    hash = "sha256-XD4zJzCktGi/E9sA6BVm9JVQBVrG5119EjZNbP1pVJU=";
+    hash = "sha256-M2vZqTMkob+WxUnCo4NDxS4pCVNleVBqkiiRp9nG/KA=";
   };
 
-  nativeBuildInputs = [ gaucheBootstrap pkg-config texinfo autoreconfHook ];
+  nativeBuildInputs = [
+    gaucheBootstrap
+    pkg-config
+    texinfo
+    autoreconfHook
+  ];
 
-  buildInputs = [ libiconv gdbm openssl zlib mbedtls cacert ] ++ lib.optionals stdenv.isDarwin [ CoreServices ];
+  buildInputs = [
+    libiconv
+    gdbm
+    openssl
+    zlib
+    mbedtls
+    cacert
+  ] ++ lib.optionals stdenv.isDarwin [ CoreServices ];
 
   autoreconfPhase = ''
     ./DIST gen