diff --git a/flatpak/README.md b/flatpak/README.md
index 4c3362690..7839b3d8e 100644
--- a/flatpak/README.md
+++ b/flatpak/README.md
@@ -4,8 +4,8 @@ Install gajim flatpak repo
 --------------------------
 
 1. `flatpak --user remote-add --from gnome https://sdk.gnome.org/gnome.flatpakrepo`
-1. `flatpak --user install gnome org.gnome.Platform//3.26`
-1. `flatpak --user install gnome org.gnome.Sdk//3.26`
+1. `flatpak --user install gnome org.gnome.Platform//3.28`
+1. `flatpak --user install gnome org.gnome.Sdk//3.28`
 1. `flatpak-builder --repo=repo directory gajim/org.gajim.Gajim.json`
 1. `flatpak --user remote-add --no-gpg-verify repo repo`
 1. `flatpak --user install repo org.gajim.Gajim`
diff --git a/org.gajim.Gajim.json b/org.gajim.Gajim.json
index 7a0b990ba..a89da8902 100644
--- a/org.gajim.Gajim.json
+++ b/org.gajim.Gajim.json
@@ -1,7 +1,7 @@
 {
     "app-id": "org.gajim.Gajim",
     "runtime": "org.gnome.Platform",
-    "runtime-version": "3.26",
+    "runtime-version": "3.28",
     "sdk": "org.gnome.Sdk",
     "command": "gajim",
     "tags": ["nightly"],