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;