diff --git a/README.md b/README.md
index 8d2a58c..072e502 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ nix run github:AmanoTeam/Papo
 ### Flatpak
 
 ```sh
-flatpak-builder --install --user build build-aux/com.amanoteam.Papo.json
+flatpak-builder --install --user --install-deps-from=flathub build build-aux/com.amanoteam.Papo.json
 ```
 
 ### Build from source
diff --git a/build-aux/com.amanoteam.Papo.Devel.json b/build-aux/com.amanoteam.Papo.Devel.json
index fa6ae3a..69a796c 100644
--- a/build-aux/com.amanoteam.Papo.Devel.json
+++ b/build-aux/com.amanoteam.Papo.Devel.json
@@ -30,6 +30,12 @@
         "test-args": ["--socket=x11", "--share=network"]
     },
     "modules": [
+        {
+            "name": "grass",
+            "buildsystem": "simple",
+            "build-commands": ["cargo install --locked --root=/app grass"],
+            "sources": []
+        },
         {
             "name": "papo",
             "buildsystem": "meson",
diff --git a/build-aux/com.amanoteam.Papo.json b/build-aux/com.amanoteam.Papo.json
index cbbaf95..65905dd 100644
--- a/build-aux/com.amanoteam.Papo.json
+++ b/build-aux/com.amanoteam.Papo.json
@@ -29,6 +29,12 @@
         "test-args": ["--socket=x11", "--share=network"]
     },
     "modules": [
+        {
+            "name": "grass",
+            "buildsystem": "simple",
+            "build-commands": ["cargo install --locked --root=/app grass"],
+            "sources": []
+        },
         {
             "name": "papo",
             "buildsystem": "meson",