--- a/modules/signing_scriptworker/manifests/init.pp
+++ b/modules/signing_scriptworker/manifests/init.pp
@@ -27,17 +27,17 @@ class signing_scriptworker {
                   "mohawk==0.3.3",
                   "multidict==1.1.0",
                   "pefile==2016.7.26",
                   "pycrypto==2.6.1",
                   "python-dateutil==2.5.3",
                   "python-jose==1.0.0",
                   "requests==2.10.0",
                   "scriptworker==0.3.0",
-                  "signingscript==0.3.0",
+                  "signingscript==0.4.0",
                   "signtool==2.0.2",
                   "six==1.10.0",
                   "slugid==1.0.7",
                   "taskcluster==0.3.4",
                   "virtualenv==15.0.2",
             ];
     }