diff --git a/pkgs/by-name/to/todoist-electron/package.nix b/pkgs/by-name/to/todoist-electron/package.nix
index c0e39da0f103..9edcaebe2efe 100644
--- a/pkgs/by-name/to/todoist-electron/package.nix
+++ b/pkgs/by-name/to/todoist-electron/package.nix
@@ -1,5 +1,6 @@
 {
   lib,
+  stdenv,
   appimageTools,
   fetchurl,
   asar,
@@ -7,13 +8,14 @@
 }:
 
 let
-  pname = "todoist-electron";
-  version = "9.18.0";
+  sources = import ./sources.nix;
 
-  src = fetchurl {
-    url = "https://electron-dl.todoist.net/linux/Todoist-linux-${version}-x86_64-latest.AppImage";
-    hash = "sha256-2X//beSpQ1rCqU4Wn5ELoxgfi2knFAJ2w1rn41TNP6g=";
-  };
+  pname = "todoist-electron";
+  version = sources.version;
+  src =
+    fetchurl
+      sources.${stdenv.hostPlatform.system}
+        or (throw "Unsupported system: ${stdenv.hostPlatform.system}");
 
   appimageContents = appimageTools.extract {
     inherit pname version src;
@@ -54,6 +56,6 @@ appimageTools.wrapAppImage {
       kylesferrazza
       pokon548
     ];
-    platforms = [ "x86_64-linux" ];
+    platforms = lib.attrNames sources;
   };
 }
diff --git a/pkgs/by-name/to/todoist-electron/sources.nix b/pkgs/by-name/to/todoist-electron/sources.nix
new file mode 100644
index 000000000000..221730a6b483
--- /dev/null
+++ b/pkgs/by-name/to/todoist-electron/sources.nix
@@ -0,0 +1,13 @@
+# Generated by ./update.sh - do not update manually!
+# Last updated: 2025-09-25
+{
+  version = "9.20.0";
+  x86_64-linux = {
+    url = "https://electron-dl.todoist.net/linux/Todoist-linux-9.20.0-x86_64-latest.AppImage";
+    hash = "sha256-Rpn7cobgYQt06d+t5XDYUZTOc/pnpRJIEXZeDAiJIH8=";
+  };
+  aarch64-linux = {
+    url = "https://electron-dl.todoist.net/linux/Todoist-linux-9.20.0-arm64-latest.AppImage";
+    hash = "sha256-0oyJXgu7BYjnKak3Gxo8XtI0kmGvPvAfNAB4fRnZsoE=";
+  };
+}
diff --git a/pkgs/by-name/to/todoist-electron/update.sh b/pkgs/by-name/to/todoist-electron/update.sh
new file mode 100644
index 000000000000..fe5afc3034d9
--- /dev/null
+++ b/pkgs/by-name/to/todoist-electron/update.sh
@@ -0,0 +1,31 @@
+#! /usr/bin/env nix-shell
+#! nix-shell -i bash --pure --keep GITHUB_TOKEN -p nix git curl cacert nix-prefetch-git gnugrep
+
+base_url=$(curl -Ls -o /dev/null -w %{url_effective} https://todoist.com/linux_app/appimage)
+version=$(echo $base_url | grep -oP '(?<=Todoist-linux-)(\d+\.\d+\.\d+)')
+
+url=()
+hash=()
+
+for i in x86_64 arm64
+do
+    current_url=$(echo $base_url | sed "s/x86_64/$i/")
+    url+=($current_url)
+    hash+=("$(nix --extra-experimental-features nix-command hash convert --hash-algo sha256 --to sri $(nix-prefetch-url $current_url))")
+done
+
+cat >sources.nix <<EOF
+# Generated by ./update.sh - do not update manually!
+# Last updated: $(date +%F)
+{
+  version = "$version";
+  x86_64-linux = {
+    url = "${url[0]}";
+    hash = "${hash[0]}";
+  };
+  aarch64-linux = {
+    url = "${url[1]}";
+    hash = "${hash[1]}";
+  };
+}
+EOF