diff --git a/README.md b/README.md
index 93093e9..86d2b8d 100644
--- a/README.md
+++ b/README.md
@@ -5,3 +5,24 @@ Uses [Ghostty app image](https://github.com/psadi/ghostty-appimage)
 
 I do not believe this flake will work on NixOS proper. Appimages use a wrapper
 there that do not work outside of NixOS.
+
+Updating the flake for new AppImage releases
+---------------------------------------------
+
+1. Update `upstreamVersion` and `appimageVersion` in `flake.nix` (e.g. `"1.3.0"` and `"v1.3.0"`).
+
+2. Get the new SRI hashes for each architecture:
+
+```bash
+# x86_64
+nix-prefetch-url --type sha256 \
+  "https://github.com/psadi/ghostty-appimage/releases/download/v<VERSION>/Ghostty-<VERSION>-x86_64.AppImage" \
+  | xargs nix hash convert --hash-algo sha256 --to sri
+
+# aarch64
+nix-prefetch-url --type sha256 \
+  "https://github.com/psadi/ghostty-appimage/releases/download/v<VERSION>/Ghostty-<VERSION>-aarch64.AppImage" \
+  | xargs nix hash convert --hash-algo sha256 --to sri
+```
+
+3. Replace the corresponding `hash` values in `flake.nix` with the output from the commands above.
diff --git a/flake.nix b/flake.nix
index f5a49ea..1245428 100644
--- a/flake.nix
+++ b/flake.nix
@@ -8,8 +8,8 @@
   outputs = { self, nixpkgs }:
     let
       # actual versions
-      upstreamVersion = "1.2.2";
-      appimageVersion = "v1.2.2";
+      upstreamVersion = "1.3.0";
+      appimageVersion = "v1.3.0";
 
       # tip is harder to get to, and looks like this:
       # upstreamVersion = "1.1.4-main+b58a761";
@@ -34,9 +34,9 @@
             #     "https://git.lerch.org/api/packages/lobo/generic/ghostty-appimage/1.2.0/Ghostty-1.2.0-aarch64.AppImage";
             url = "https://github.com/psadi/ghostty-appimage/releases/download/${appimageVersion}/${appimagename}";
             hash = if system == "x86_64-linux" then
-                "sha256-9FqakNv4p9HTvYv8ed1AQapRolCHfpk1RhmaC2Jwwqk="
+                "sha256-+SSYIGNmkN1HR7zX6ysILUGhweY6aVanoTDEAeldIr8="
               else
-                "sha256-0LoDwLDALY1CriTMs63Eln74nGwuQzWo2A1IYGoMEn4=";
+                "sha256-S+ojUZxmNvJaAFcGOXLRO18wPkUKiY45tQBX0bEEPIE=";
           };
 
           nativeBuildInputs = [ pkgs.makeWrapper ];