diff --git a/configure.ac b/configure.ac

index eea70fc..c4569f1 100644

--- a/configure.ac

+++ b/configure.ac

@@ -34,7 +34,7 @@ AC_PROG_LN_S

 AC_SYS_LARGEFILE

 AM_PROG_CC_C_O

 AC_PROG_CXX

-AX_CXX_COMPILE_STDCXX([14], [], [mandatory])

+AX_CXX_COMPILE_STDCXX([17], [], [mandatory])

 # Taken from dbus

 AC_ARG_ENABLE(ansi,             [  --enable-ansi           enable -ansi -pedantic gcc flags],enable_ansi=$enableval,enable_ansi=no)

@@ -80,7 +80,7 @@ PKG_CHECK_MODULES(GLIB, [gmodule-2.0 gio-unix-2.0 >= 2.30.0])

 AC_SUBST(GLIB_CFLAGS)

 AC_SUBST(GLIB_LIBS)

-PKG_CHECK_MODULES(LIBJS, [mozjs-68])

+PKG_CHECK_MODULES(LIBJS, [mozjs-78])

 AC_SUBST(LIBJS_CFLAGS)

 AC_SUBST(LIBJS_CXXFLAGS)

diff --git a/src/polkitbackend/polkitbackendjsauthority.cpp b/src/polkitbackend/polkitbackendjsauthority.cpp

index 25bd1f9..ca17108 100644

--- a/src/polkitbackend/polkitbackendjsauthority.cpp

+++ b/src/polkitbackend/polkitbackendjsauthority.cpp

@@ -49,6 +49,7 @@

 #include <js/Realm.h>

 #include <js/SourceText.h>

 #include <js/Warnings.h>

+#include <js/Array.h>

 #include <jsapi.h>

 #include "initjs.h" /* init.js */

@@ -367,7 +368,7 @@ load_scripts (PolkitBackendJsAuthority  *authority)

 static void

 reload_scripts (PolkitBackendJsAuthority *authority)

 {

-  JS::AutoValueArray<1> args(authority->priv->cx);

+  JS::RootedValueArray<1> args(authority->priv->cx);

   JS::RootedValue rval(authority->priv->cx);

   JS::RootedObject js_polkit(authority->priv->cx, authority->priv->js_polkit->get ());

@@ -482,10 +483,6 @@ polkit_backend_js_authority_constructed (GObject *object)

   if (!JS::InitSelfHostedCode (authority->priv->cx))

     goto fail;

-  JS::ContextOptionsRef (authority->priv->cx)

-      .setIon (TRUE)

-      .setBaseline (TRUE)

-      .setAsmJS (TRUE);

   JS::SetWarningReporter(authority->priv->cx, report_error);

   JS_SetContextPrivate (authority->priv->cx, authority);

@@ -720,7 +717,7 @@ set_property_strv (PolkitBackendJsAuthority  *authority,

         elems[n].setNull ();

     }

-  JS::RootedObject array_object(authority->priv->cx, JS_NewArrayObject (authority->priv->cx, elems));

+  JS::RootedObject array_object(authority->priv->cx, JS::NewArrayObject (authority->priv->cx, elems));

   value_jsval = JS::ObjectValue (*array_object);

   JS_SetProperty (authority->priv->cx, obj, name, value_jsval);

@@ -1114,7 +1111,7 @@ polkit_backend_js_authority_get_admin_auth_identities (PolkitBackendInteractiveA

 {

   PolkitBackendJsAuthority *authority = POLKIT_BACKEND_JS_AUTHORITY (_authority);

   GList *ret = NULL;

-  JS::AutoValueArray<2> args(authority->priv->cx);

+  JS::RootedValueArray<2> args(authority->priv->cx);

   JS::RootedValue rval(authority->priv->cx);

   guint n;

   GError *error = NULL;

@@ -1218,7 +1215,7 @@ polkit_backend_js_authority_check_authorization_sync (PolkitBackendInteractiveAu

 {

   PolkitBackendJsAuthority *authority = POLKIT_BACKEND_JS_AUTHORITY (_authority);

   PolkitImplicitAuthorization ret = implicit;

-  JS::AutoValueArray<2> args(authority->priv->cx);

+  JS::RootedValueArray<2> args(authority->priv->cx);

   JS::RootedValue rval(authority->priv->cx);

   GError *error = NULL;

   JS::RootedString ret_jsstr (authority->priv->cx);

@@ -1409,7 +1406,7 @@ js_polkit_spawn (JSContext  *cx,

   JS::CallArgs args = JS::CallArgsFromVp (js_argc, vp);

   array_object = &args[0].toObject();

-  if (!JS_GetArrayLength (cx, array_object, &array_len))

+  if (!JS::GetArrayLength (cx, array_object, &array_len))

     {

       JS_ReportErrorUTF8 (cx, "Failed to get array length");

       goto out;