diff --git a/build.xml b/build.xml
index 8516148e..ed67d11f 100644
--- a/build.xml
+++ b/build.xml
@@ -643,7 +643,7 @@
 			<arg line="${dir.dist}/msi.wixobj -sval -ext WixUIExtension -out ${installer}" />
 		</exec>
 		<exec executable="signtool.exe" dir="${dir.installer}/msi" failonerror="true">
-			<arg line="sign /t http://timestamp.verisign.com/scripts/timstamp.dll /v /a ${installer}" />
+			<arg line="sign /fd SHA256 /t http://time.certum.pl/ /v /a ${installer}" />
 		</exec>
 	</target>