diff --git a/setup.py b/setup.py
index 4039f0e..8760298 100644
--- a/setup.py
+++ b/setup.py
@@ -18,5 +18,5 @@
     include_package_data=True,
     zip_safe=False,
     licence='MIT',
-    install_requires=['signxml==1.0.2']
+    install_requires=['signxml==4.0.4']
 )