diff --git a/pkgs/applications/networking/instant-messengers/fluffychat/default.nix b/pkgs/applications/networking/instant-messengers/fluffychat/default.nix
index 565c44f72e9..f20a3d4e9be 100644
--- a/pkgs/applications/networking/instant-messengers/fluffychat/default.nix
+++ b/pkgs/applications/networking/instant-messengers/fluffychat/default.nix
@@ -4,13 +4,19 @@
 , olm
 , imagemagick
 , makeDesktopItem
+, stdenv
 }:
 
+let vendorHashes = {
+  x86_64-linux = "sha256-p5EJP2zSvWyRV1uyTHw0EpFsEwAGtX5B9WVjpLmnVew=";
+  aarch64-linux = "sha256-Ps0HmDI6BFxHrLRq3KWNk4hw0qneq5hqB/Mp99f+hO4=";
+};
+in
 flutter.mkFlutterApp rec {
   pname = "fluffychat";
   version = "1.6.1";
 
-  vendorHash = "sha256-SelMRETFYZgTStV90gRoKhazu1NPbcSMO9mYebSQskQ=";
+  vendorHash = vendorHashes."${stdenv.hostPlatform.system}" or (throw "unsupported system: ${stdenv.hostPlatform.system}");
 
   src = fetchFromGitLab {
     owner = "famedly";
diff --git a/pkgs/development/compilers/flutter/default.nix b/pkgs/development/compilers/flutter/default.nix
index 9eba6773448..e9d352169b2 100644
--- a/pkgs/development/compilers/flutter/default.nix
+++ b/pkgs/development/compilers/flutter/default.nix
@@ -19,6 +19,10 @@ let
         url = "${dartSourceBase}/stable/release/${dartVersion}/sdk/dartsdk-linux-x64-release.zip";
         sha256 = "sha256-PMY6DCFQC8XrlnFzOEPcwgBAs5/cAvNd78969Z+I1Fk=";
       };
+      "${dartVersion}-aarch64-linux" = fetchurl {
+        url = "${dartSourceBase}/stable/release/${dartVersion}/sdk/dartsdk-linux-arm64-release.zip";
+        sha256 = "sha256-BIK6kUx+m+/GfR/wBXv8rjVNbP6w1HFvH/RGIwiaJog=";
+      };
     };
   };
 in {