diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 9d482fbd..4320cd34 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -3,7 +3,7 @@ stages:
   - test
 
 flatpak:
-  image: 'registry.gitlab.gnome.org/gnome/gnome-runtime-images/rust_bundle:3.38'
+  image: 'registry.gitlab.gnome.org/gnome/gnome-runtime-images/rust_bundle:master'
   stage: test
   tags:
     - flatpak
diff --git a/build-aux/org.gnome.FractalNext.Devel.json b/build-aux/org.gnome.FractalNext.Devel.json
index 2ce2d156..340f4245 100644
--- a/build-aux/org.gnome.FractalNext.Devel.json
+++ b/build-aux/org.gnome.FractalNext.Devel.json
@@ -1,7 +1,7 @@
 {
     "app-id": "org.gnome.FractalNext.Devel",
     "runtime": "org.gnome.Platform",
-    "runtime-version": "3.38",
+    "runtime-version": "master",
     "sdk": "org.gnome.Sdk",
     "sdk-extensions": ["org.freedesktop.Sdk.Extension.rust-stable"],
     "command": "fractal",
@@ -29,65 +29,6 @@
         }
     },
     "modules": [
-        {
-            "name": "gtk4",
-            "buildsystem": "meson",
-            "config-opts": [
-                "-Ddemos=false",
-                "-Dbuild-examples=false",
-                "-Dbuild-tests=false"
-            ],
-            "sources": [
-                {
-                    "type": "archive",
-                    "url": "https://download.gnome.org/sources/gtk/4.0/gtk-4.0.0.tar.xz",
-                    "sha256": "d46cf5b127ea27dd9e5d2ff6ed500cb4067eeb2cb1cd2c313ccde8013b0b9bf9"
-                }
-            ],
-            "modules": [
-                {
-                    "name": "pango",
-                    "buildsystem": "meson",
-                    "sources": [
-                        {
-                            "type": "archive",
-                            "url": "https://download.gnome.org/sources/pango/1.48/pango-1.48.0.tar.xz",
-                            "sha256": "391f26f3341c2d7053e0fb26a956bd42360dadd825efe7088b1e9340a65e74e6"
-                        }
-                    ]
-                },
-                {
-                    "name": "libsass",
-                    "sources": [
-                        {
-                            "type": "archive",
-                            "url": "https://github.com/sass/libsass/archive/3.6.4.tar.gz",
-                            "sha256": "f9484d9a6df60576e791566eab2f757a97fd414fce01dd41fc0a693ea5db2889"
-                        },
-                        {
-                            "type": "script",
-                            "dest-filename": "autogen.sh",
-                            "commands": ["autoreconf -si"]
-                        }
-                    ]
-                },
-                {
-                    "name": "sassc",
-                    "sources": [
-                        {
-                            "type": "archive",
-                            "url": "https://github.com/sass/sassc/archive/3.6.1.tar.gz",
-                            "sha256": "8cee391c49a102b4464f86fc40c4ceac3a2ada52a89c4c933d8348e3e4542a60"
-                        },
-                        {
-                            "type": "script",
-                            "dest-filename": "autogen.sh",
-                            "commands": ["autoreconf -si"]
-                        }
-                    ]
-                }
-            ]
-        },
         {
             "name": "libadwaita",
             "buildsystem": "meson",