diff --git a/testimage.sh b/testimage.sh
index 6bd6bc19dc319029e06b6691976ad0d5410b97ef..a2b624067a70d9c5e4d708e9d696ea3a62726369 100644
--- a/testimage.sh
+++ b/testimage.sh
@@ -2,6 +2,24 @@
 export PATH="/ci/bin:/ci/vendor/bin:$PATH"
 . ~/.nvm/nvm.sh
 git clone --branch "$QSTACK_VERSION" https://github.com/maths/moodle-qtype_stack
+cd moodle-qtype_stack || exit 1
+patch -p1 << "EOF"
+diff --git a/db/install.php b/db/install.php
+index d573cde9..63f6a16e 100644
+--- a/db/install.php
++++ b/db/install.php
+@@ -58,7 +58,7 @@ function xmldb_qtype_stack_install() {
+         // Set to the same defaults as in settings.php - however, that has not been done
+         // yet in the Moodle install code flow, so we have to duplicate here.
+         set_config('maximaversion', 'default', 'qtype_stack');
+-        set_config('castimeout', 10, 'qtype_stack');
++        set_config('castimeout', 120, 'qtype_stack');
+         set_config('casresultscache', 'db', 'qtype_stack');
+         set_config('maximacommand', '', 'qtype_stack');
+         set_config('serveruserpass', '', 'qtype_stack');
+EOF
+cd ..
+
 moodle-plugin-ci add-plugin maths/moodle-qbehaviour_dfexplicitvaildate
 moodle-plugin-ci add-plugin maths/moodle-qbehaviour_dfcbmexplicitvaildate
 moodle-plugin-ci add-plugin maths/moodle-qbehaviour_adaptivemultipart
@@ -12,7 +30,7 @@ moodle-plugin-ci add-config 'define("QTYPE_STACK_TEST_CONFIG_PLATFORM",        "
 moodle-plugin-ci add-config 'define("QTYPE_STACK_TEST_CONFIG_MAXIMAVERSION",   "5.41.0");'
 moodle-plugin-ci add-config 'define("QTYPE_STACK_TEST_CONFIG_CASTIMEOUT",      "10");'
 moodle-plugin-ci add-config 'define("QTYPE_STACK_TEST_CONFIG_CASRESULTSCACHE", "db");'
-moodle-plugin-ci add-config 'define("QTYPE_STACK_TEST_CONFIG_MAXIMACOMMAND",   "http://kubecluster.test/godev/");'
+moodle-plugin-ci add-config 'define("QTYPE_STACK_TEST_CONFIG_MAXIMACOMMAND",   "http://2020042000.kub00.math.uni-goettingen.de/goemaxima");'
 moodle-plugin-ci add-config 'define("QTYPE_STACK_TEST_CONFIG_PLOTCOMMAND",     "gnuplot");'
 moodle-plugin-ci add-config 'define("QTYPE_STACK_TEST_CONFIG_MAXIMALIBRARIES", "stats, distrib, descriptive, simplex");'
 moodle-plugin-ci add-config 'define("QTYPE_STACK_TEST_CONFIG_CASDEBUGGING",    "0");'