diff --git a/mod/book/db/install.xml b/mod/book/db/install.xml
index 61c38b4eb6a..b991b1b18be 100644
--- a/mod/book/db/install.xml
+++ b/mod/book/db/install.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/book/db" VERSION="20200907" COMMENT="XMLDB file for Moodle mod_book"
+<XMLDB PATH="mod/book/db" VERSION="20220530" COMMENT="XMLDB file for Moodle mod_book"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
@@ -20,6 +20,7 @@
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
+        <KEY NAME="course" TYPE="foreign" FIELDS="course" REFTABLE="course" REFFIELDS="id"/>
       </KEYS>
     </TABLE>
     <TABLE NAME="book_chapters" COMMENT="Defines book_chapters">
diff --git a/mod/book/db/upgrade.php b/mod/book/db/upgrade.php
index db6abc23599..a4145c7c409 100644
--- a/mod/book/db/upgrade.php
+++ b/mod/book/db/upgrade.php
@@ -48,6 +48,16 @@ function xmldb_book_upgrade($oldversion) {
 
     // Automatically generated Moodle v4.0.0 release upgrade line.
     // Put any upgrade step following this.
+    if ($oldversion < 2022053000) {
+        // Define key course (foreign) to be added to book.
+        $table = new xmldb_table('book');
+        $key = new xmldb_key('course', XMLDB_KEY_FOREIGN, ['course'], 'course', ['id']);
+        // Launch add key course.
+        $dbman->add_key($table, $key);
+
+        // Book savepoint reached.
+        upgrade_mod_savepoint(true, 2022053000, 'book');
+    }
 
     return true;
 }
diff --git a/mod/book/version.php b/mod/book/version.php
index cf37ab93b75..83d09ef319b 100644
--- a/mod/book/version.php
+++ b/mod/book/version.php
@@ -25,6 +25,6 @@
 defined('MOODLE_INTERNAL') || die;
 
 $plugin->component = 'mod_book'; // Full name of the plugin (used for diagnostics)
-$plugin->version   = 2022041900; // The current module version (Date: YYYYMMDDXX).
+$plugin->version   = 2022053000; // The current module version (Date: YYYYMMDDXX).
 $plugin->requires  = 2022041200; // Requires this Moodle version.
 $plugin->cron      = 0;          // Period for cron to check this module (secs)