diff --git a/roles/moodle/tasks/install.yml b/roles/moodle/tasks/install.yml
index f15289ce1..9d4ef7c48 100644
--- a/roles/moodle/tasks/install.yml
+++ b/roles/moodle/tasks/install.yml
@@ -26,9 +26,10 @@
       - php{{ php_version }}-zip
       - php{{ php_version }}-gd
       - php{{ php_version }}-mbstring    # 2020-06-15: Required by Moodle 3.9+
-      - php{{ php_version }}-cli     # 2020-06-15: In the past this included (above) mbstring? However this is not true on Ubuntu Server 20.04 LTS.
-      - php{{ php_version }}-intl    # 2020-12-03: Required by Moodle 3.10+
-      - php{{ php_version }}-soap    # 2020-12-03: Recommended by Moodle 3.10+
+      - php{{ php_version }}-cli         # 2020-06-15: In the past this included (above) mbstring? However this is not true on Ubuntu Server 20.04 LTS.
+      - php{{ php_version }}-intl        # 2020-12-03: Required by Moodle 3.10+
+      - php{{ php_version }}-soap        # 2020-12-03: Recommended by Moodle 3.10+
+      - php{{ php_version }}-sodium      # 2021-05-17: Recommended by Moodle 3.11+ at https://docs.moodle.org/311/en/Environment_-_PHP_extension_sodium
     state: present
   when: is_debuntu