diff --git a/ansible/admin.yml b/ansible/admin.yml
index 630b9d5..25c9189 100644
--- a/ansible/admin.yml
+++ b/ansible/admin.yml
@@ -34,7 +34,7 @@
       include_tasks: create-users.yml
       vars:
         users: "{{ projects[item].users }}"
-      loop: "{{ projects.keys() }}"
+      loop: "{{ projects.keys() | list }}"
 
     - name: create project directories in lustre fs
       file:
diff --git a/ansible/create-users.yml b/ansible/create-users.yml
index 68afc83..53b4a6e 100644
--- a/ansible/create-users.yml
+++ b/ansible/create-users.yml
@@ -5,7 +5,7 @@
     name: "{{ name }}"
     gid: "{{ users[name].guid }}"
     state: present
-  loop: "{{ users.keys() }}"
+  loop: "{{ users.keys() | list }}"
   loop_control:
     loop_var: name
   
@@ -17,7 +17,7 @@
     groups: "{{ users[name].groups }}"
     state: present
     remove: "yes"
-  loop: "{{ users.keys() }}"
+  loop: "{{ users.keys() | list }}"
   loop_control:
     loop_var: name
   
\ No newline at end of file
diff --git a/ansible/roles/common/tasks/kernel.yml b/ansible/roles/common/tasks/kernel.yml
index c775c5d..ce83599 100644
--- a/ansible/roles/common/tasks/kernel.yml
+++ b/ansible/roles/common/tasks/kernel.yml
@@ -1,6 +1,6 @@
 - name: install kernel
   yum:
-    name: http://mirror.centos.org/centos/7/updates/x86_64/Packages/kernel-3.10.0-1062.9.1.el7.x86_64.rpm
+    name: http://vault.centos.org/7.7.1908/updates/x86_64/Packages/kernel-3.10.0-1062.9.1.el7.x86_64.rpm
     state: present
   register: update_kernel
 - name: reboot if kernel updated
diff --git a/ansible/users.yml b/ansible/users.yml
index 59d2867..8eed1ba 100644
--- a/ansible/users.yml
+++ b/ansible/users.yml
@@ -7,7 +7,7 @@
       include_tasks: create-users.yml
       vars:
         users: "{{ projects[item].users }}"
-      loop: "{{ projects.keys() }}"
+      loop: "{{ projects.keys() | list }}"
 
     - name: create demo user user/groups
       include_tasks: create-users.yml
@@ -23,7 +23,7 @@
       include_tasks: create-users.yml
       vars:
         users: "{{ projects[item].users }}"
-      loop: "{{ projects.keys() }}"
+      loop: "{{ projects.keys() | list }}"
 
     - name: create demo user user/groups
       include_tasks: create-users.yml