diff --git a/build_gui.sh b/build_gui.sh
index 6f67c4d..663c3fd 100755
--- a/build_gui.sh
+++ b/build_gui.sh
@@ -7,6 +7,7 @@ mvn -Dassembly.skipAssembly -Djarsigner.skip=true clean install
 cd -
 
 # Build all modules (skip test)
-mvn process-resources
+# note: use insecure https as restlet https certificates are out-dated!
+mvn -Dmaven.wagon.http.ssl.insecure=true -Dmaven.wagon.http.ssl.ignore.validity.dates=true process-resources
 mvn -Djarsigner.skip=true -Dmaven.javadoc.skip=true -Dmaven.test.skip=true clean install