diff --git a/pkgs/applications/networking/instant-messengers/signal-desktop/default.nix b/pkgs/applications/networking/instant-messengers/signal-desktop/default.nix
index 51075425b4f9..81967bcbe2b7 100644
--- a/pkgs/applications/networking/instant-messengers/signal-desktop/default.nix
+++ b/pkgs/applications/networking/instant-messengers/signal-desktop/default.nix
@@ -18,14 +18,12 @@ let
       # E.g. "de_DE" -> "de-de" (spellcheckerLanguage -> hunspellDict)
       spellLangComponents = splitString "_" spellcheckerLanguage;
       hunspellDict = elemAt spellLangComponents 0 + "-" + toLower (elemAt spellLangComponents 1);
-    in if spellcheckerLanguage != null
-      then ''
-        --set HUNSPELL_DICTIONARIES "${hunspellDicts.${hunspellDict}}/share/hunspell" \
-        --set LC_MESSAGES "${spellcheckerLanguage}"''
-      else "");
+    in lib.optionalString (spellcheckerLanguage != null) ''
+      --set HUNSPELL_DICTIONARIES "${hunspellDicts.${hunspellDict}}/share/hunspell" \
+      --set LC_MESSAGES "${spellcheckerLanguage}"'');
 in stdenv.mkDerivation rec {
   pname = "signal-desktop";
-  version = "5.18.1"; # Please backport all updates to the stable channel.
+  version = "5.19.0"; # Please backport all updates to the stable channel.
   # All releases have a limited lifetime and "expire" 90 days after the release.
   # When releases "expire" the application becomes unusable until an update is
   # applied. The expiration date for the current release can be extracted with:
@@ -35,7 +33,7 @@ in stdenv.mkDerivation rec {
 
   src = fetchurl {
     url = "https://updates.signal.org/desktop/apt/pool/main/s/signal-desktop/signal-desktop_${version}_amd64.deb";
-    sha256 = "0x1wrzxyspghv0hwdh3sw8536c9qi7211d2g5cr3f33kz9db5xp4";
+    sha256 = "0avns5axcfs8x9sv7hyjxi1cr7gag00avfj0h99wgn251b313g1a";
   };
 
   nativeBuildInputs = [