diff --git a/classes/associationservice.php b/classes/associationservice.php
index 677f0ae..f64f00d 100644
--- a/classes/associationservice.php
+++ b/classes/associationservice.php
@@ -411,10 +411,10 @@ class associationservice extends \external_api {
                 LEFT JOIN {cohort_members}              cm ON u.id = cm.userid
                 LEFT JOIN {local_treestudyplan_cohort}  tc ON cm.cohortid = tc.cohort_id
                 LEFT JOIN {local_treestudyplan_user}    tu ON u.id = tu.user_id
-                WHERE tc.studyplan_id = {$studyplan->id()}
-                    OR tu.studyplan_id = {$studyplan->id()}
+                WHERE tc.studyplan_id = :studyplanid
+                    OR tu.studyplan_id = :studyplanidtoo
                 ORDER BY u.lastname, u.firstname";
-        $rs = $DB->get_recordset_sql($sql);
+        $rs = $DB->get_recordset_sql($sql,["studyplanid" => $studyplan->id(), "studyplanidtoo" => $studyplan->id()]);
 
         foreach ($rs as $u) {
             $users[] = self::make_user_model($u);
diff --git a/classes/local/ungradedscanners/assign_scanner.php b/classes/local/ungradedscanners/assign_scanner.php
index 5ffca41..1bb5e35 100644
--- a/classes/local/ungradedscanners/assign_scanner.php
+++ b/classes/local/ungradedscanners/assign_scanner.php
@@ -31,13 +31,13 @@ class assign_scanner extends scanner_base {
                 JOIN {assign} a ON a.id = asgn_sub.assignment
                 LEFT JOIN {assign_grades} ag ON ag.assignment = asgn_sub.assignment AND ag.userid = asgn_sub.userid
                     AND asgn_sub.attemptnumber = ag.attemptnumber
-                WHERE a.id = {$this->gi->iteminstance}
+                WHERE a.id = :iteminstance
                     AND asgn_sub.status = 'submitted'
                     AND asgn_sub.userid > 0
                     AND a.grade <> 0 AND (ag.id IS NULL OR asgn_sub.timemodified >= ag.timemodified)
                 ";
 
-        return $DB->get_fieldset_sql($sql);
+        return $DB->get_fieldset_sql($sql,['iteminstance' => $this->gi->iteminstance]);
     }
 
     protected function get_graded_users() {
@@ -45,9 +45,9 @@ class assign_scanner extends scanner_base {
         $sql = "SELECT DISTINCT g.userid
                 FROM {grade_grades} g
                 LEFT JOIN {grade_items} gi on g.itemid = gi.id
-                WHERE gi.itemmodule = 'assign' AND gi.iteminstance = {$this->gi->iteminstance}
+                WHERE gi.itemmodule = 'assign' AND gi.iteminstance = :iteminstance
                     AND g.finalgrade IS NOT NULL"; // MAy turn out to be needed, dunno.
-        return $DB->get_fieldset_sql($sql);
+        return $DB->get_fieldset_sql($sql,['iteminstance' => $this->gi->iteminstance]);
     }
 
     public function count_ungraded($courseuserids = []) {
diff --git a/classes/local/ungradedscanners/quiz_scanner.php b/classes/local/ungradedscanners/quiz_scanner.php
index b343e66..5164afd 100644
--- a/classes/local/ungradedscanners/quiz_scanner.php
+++ b/classes/local/ungradedscanners/quiz_scanner.php
@@ -37,9 +37,9 @@ class quiz_scanner extends scanner_base {
                 FROM {question_attempt_steps} qas
                 JOIN {question_attempts} qna ON qas.questionattemptid = qna.id
                 JOIN {quiz_attempts} qza ON qna.questionusageid = qza.uniqueid
-                WHERE qas.state = 'needsgrading' AND qza.quiz = {$this->gi->iteminstance}";
+                WHERE qas.state = 'needsgrading' AND qza.quiz = :iteminstance";
 
-        $rs = $DB->get_recordset_sql($sql);
+        $rs = $DB->get_recordset_sql($sql,['iteminstance' => $this->gi->iteminstance]);
         $submissions = [];
         foreach ($rs as $r) {
             // Now, check if .
@@ -69,10 +69,10 @@ class quiz_scanner extends scanner_base {
         $sql = "SELECT DISTINCT g.userid
                 FROM {grade_grades} g
                 LEFT JOIN {grade_items} gi on g.itemid = gi.id
-                WHERE gi.itemmodule = 'quiz' AND gi.iteminstance = {$this->gi->iteminstance}
+                WHERE gi.itemmodule = 'quiz' AND gi.iteminstance = :iteminstance
                 AND g.finalgrade IS NOT NULL"; // MAy turn out to be needed, dunno.
 
-        $graded = $DB->get_fieldset_sql($sql);
+        $graded = $DB->get_fieldset_sql($sql,['iteminstance' => $this->gi->iteminstance]);
 
         if (count($courseuserids) > 0) {
             $graded = array_intersect($graded, $courseuserids);
diff --git a/version.php b/version.php
index 285ddb8..a66852a 100644
--- a/version.php
+++ b/version.php
@@ -25,6 +25,13 @@ $plugin->component = 'local_treestudyplan';  // Recommended since 2.0.2 (MDL-260
 $plugin->version = 2023082101;  // YYYYMMDDHH (year, month, day, iteration).
 $plugin->requires = 2021051700; // YYYYMMDDHH (This is the release version for Moodle 3.11).
 
+$plugin->release = "1.0.0"; 
+$plugin->maturity = MATURITY_RC;
+// Supported from Moodle 3.11 to 4.1 (4.2 not yet tested)/
+$plugin->supported = [ 311, 401 ];
+
 $plugin->dependencies = [
     'theme_boost' => 2019052000,
 ];
+
+