diff --git a/build-aux/flatpak/org.gtk.Demo4.json b/build-aux/flatpak/org.gtk.Demo4.json
index 30bfccb043009c2efc12730b7825d99105c94c69..e7ca7ddb0be0ffd42c14260a1b9580c8037ae3e1 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://boostorg.jfrog.io/artifactory/main/release/1.79.0/source/boost_1_79_0.tar.bz2",
+                     "url": "https://archives.boost.io/release/1.79.0/source/boost_1_79_0.tar.bz2",
                      "sha256": "475d589d51a7f8b3ba2ba4eda022b170e562ca3b760ee922c146b6c65856ef39"
                  }
             ]