diff --git a/pkgs/applications/networking/instant-messengers/signal-desktop/default.nix b/pkgs/applications/networking/instant-messengers/signal-desktop/default.nix
index c97a908d33d9..f60e87affcfd 100644
--- a/pkgs/applications/networking/instant-messengers/signal-desktop/default.nix
+++ b/pkgs/applications/networking/instant-messengers/signal-desktop/default.nix
@@ -2,7 +2,7 @@
 , gnome2, gtk3, atk, at-spi2-atk, cairo, pango, gdk-pixbuf, glib, freetype, fontconfig
 , dbus, libX11, xorg, libXi, libXcursor, libXdamage, libXrandr, libXcomposite
 , libXext, libXfixes, libXrender, libXtst, libXScrnSaver, nss, nspr, alsaLib
-, cups, expat, udev, libnotify, libuuid
+, cups, expat, udev, libnotify, libuuid, at-spi2-core
 # Unfortunately this also overwrites the UI language (not just the spell
 # checking language!):
 , hunspellDicts, spellcheckerLanguage ? null # E.g. "de_DE"
@@ -25,6 +25,7 @@ let
     alsaLib
     atk
     at-spi2-atk
+    at-spi2-core
     cairo
     cups
     dbus
@@ -57,11 +58,11 @@ let
 
 in stdenv.mkDerivation rec {
   pname = "signal-desktop";
-  version = "1.26.2";
+  version = "1.27.1";
 
   src = fetchurl {
     url = "https://updates.signal.org/desktop/apt/pool/main/s/signal-desktop/signal-desktop_${version}_amd64.deb";
-    sha256 = "08qx7k82x6ybqi3lln6ixzmdz4sr8yz8vfx0y408b85wjfc7ncjk";
+    sha256 = "16fg60c5r7zcjs8ya6jk33l5kz8m21y9a1si3i0a2dvyaclz4a3q";
   };
 
   phases = [ "unpackPhase" "installPhase" ];