diff --git a/roles/acertmgr/tasks/main.yml b/roles/acertmgr/tasks/main.yml
index 6d8df43..4967a7c 100644
--- a/roles/acertmgr/tasks/main.yml
+++ b/roles/acertmgr/tasks/main.yml
@@ -5,6 +5,7 @@
     name:
     - python3-cryptography
     - python3-dnspython
+    - python3-idna
     - python3-yaml
     - python3-pkg-resources