diff --git a/leshan-bsserver-demo/pom.xml b/leshan-bsserver-demo/pom.xml
index c836aa7131..66760a80b8 100644
--- a/leshan-bsserver-demo/pom.xml
+++ b/leshan-bsserver-demo/pom.xml
@@ -91,6 +91,8 @@ Contributors:
                     <workingDirectory>webapp</workingDirectory>
                     <nodeVersion>v12.22.5</nodeVersion>
                     <yarnVersion>v1.22.10</yarnVersion>
+                    <!-- See why we use a mirror : https://gitlab.eclipse.org/eclipsefdn/helpdesk/-/issues/1032 -->
+                    <yarnDownloadRoot>https://sourceforge.net/projects/yarn.mirror/files/</yarnDownloadRoot>
                 </configuration>
             </plugin>
             <plugin>
diff --git a/leshan-server-demo/pom.xml b/leshan-server-demo/pom.xml
index 3a5da3d04f..5635b676ba 100644
--- a/leshan-server-demo/pom.xml
+++ b/leshan-server-demo/pom.xml
@@ -108,6 +108,8 @@ Contributors:
                     <workingDirectory>webapp</workingDirectory>
                     <nodeVersion>v12.22.5</nodeVersion>
                     <yarnVersion>v1.22.10</yarnVersion>
+                    <!-- See why we use a mirror : https://gitlab.eclipse.org/eclipsefdn/helpdesk/-/issues/1032 -->
+                    <yarnDownloadRoot>https://sourceforge.net/projects/yarn.mirror/files/</yarnDownloadRoot>
                 </configuration>
             </plugin>
             <plugin>