diff --git a/build-aux/flatpak/org.gtk.Demo4.json b/build-aux/flatpak/org.gtk.Demo4.json
index 4adaff9da1..e009182e63 100644
--- a/build-aux/flatpak/org.gtk.Demo4.json
+++ b/build-aux/flatpak/org.gtk.Demo4.json
@@ -104,7 +104,7 @@
              "sources": [
                  {
                      "type": "archive",
-                     "url": "https://dl.bintray.com/boostorg/release/1.69.0/source/boost_1_69_0.tar.bz2",
+                     "url": "https://boostorg.jfrog.io/artifactory/main/release/1.69.0/source/boost_1_69_0.tar.bz2",
                      "sha256": "8f32d4617390d1c2d16f26a27ab60d97807b35440d45891fa340fc2648b04406"
                  }
             ]