diff --git a/roles/calibre-web/tasks/install.yml b/roles/calibre-web/tasks/install.yml
index 1d738a8df..5e1f66933 100644
--- a/roles/calibre-web/tasks/install.yml
+++ b/roles/calibre-web/tasks/install.yml
@@ -21,10 +21,11 @@
 # Official upstream instructions:
 # apt install python3-pip python3-venv
 # https://github.com/janeczku/calibre-web/wiki/Manual-installation
-- name: "Install packages: imagemagick, python3-netifaces"
+- name: "Install packages: imagemagick, python3-cryptography, python3-netifaces"
   package:
     name:
       - imagemagick
+      - python3-cryptography    # Required on Raspberry Pi OS (see iiab/calibre-web#260)
       - python3-netifaces
     state: present