diff --git a/auth/cas/db/install.php b/auth/cas/db/install.php
new file mode 100644
index 00000000000..ca412b1f826
--- /dev/null
+++ b/auth/cas/db/install.php
@@ -0,0 +1,11 @@
+<?php
+
+function xmldb_auth_cas_install() {
+    global $CFG, $DB;
+
+    // upgrade from 1.9.x, introducing version.php
+
+    // remove cached passowrds, we do not need them for this plugin
+    $DB->set_field('user', 'password', 'not cached', array('auth'=>'cas'));
+
+}
diff --git a/auth/cas/version.php b/auth/cas/version.php
new file mode 100644
index 00000000000..a744fcaaf76
--- /dev/null
+++ b/auth/cas/version.php
@@ -0,0 +1,3 @@
+<?php
+
+$plugin->version = 2009112400;