diff --git a/README.md b/README.md
index 010fea5..53d27d5 100644
--- a/README.md
+++ b/README.md
@@ -100,6 +100,8 @@ sequenceserver_user: "sequenceserver"
 Variable to define the user running the sequenceserver service and submitting the SLURM jobs. This user must have a SLURM account.
 
 ```yaml
+# NGINX version to install, from https://nginx.org/packages/mainline
+sequenceserver_nginx_version: 1.25.5
 # proxy_read_timeout (nginx directive)
 sequenceserver_proxy_read_timeout: 180
 # Authentication with LDAP - Mandatory if users or groups are used in variable sequenceserver_blast_db
diff --git a/defaults/main.yml b/defaults/main.yml
index 96e6afc..56e96fb 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -61,6 +61,8 @@ sequenceserver_user: "sequenceserver"
 
 # NGINX
 #
+# NGINX version to install
+sequenceserver_nginx_version: 1.25.5
 # proxy_read_timeout (nginx directive)
 sequenceserver_proxy_read_timeout: 180
 # Authentication with LDAP - Mandatory if users or groups are used in variable sequenceserver_blast_db
diff --git a/molecule/default/prepare.yml b/molecule/default/prepare.yml
index 7a578f2..932e83e 100644
--- a/molecule/default/prepare.yml
+++ b/molecule/default/prepare.yml
@@ -54,3 +54,8 @@
       ansible.builtin.file:
         path: /tmp
         mode: '1777'
+    - name: Install previous Nginx version, to test uninstall
+      include_role:
+        name: nginxinc.nginx
+      vars:
+        nginx_version: =1.23.1-1~focal
diff --git a/tasks/install.dependencies.yml b/tasks/install.dependencies.yml
index 32f054f..d9a3beb 100644
--- a/tasks/install.dependencies.yml
+++ b/tasks/install.dependencies.yml
@@ -2,9 +2,39 @@
 
 # NGINX
 
+- name: Get installed Nginx version
+  command:
+    cmd: nginx -v
+  register: get_nginx_version
+  check_mode: no
+  failed_when: get_nginx_version.rc != 0
+  changed_when: false
+
+- name: Uninstall NGINX if already installed
+  block:
+
+    - name: Set sequenceserver_installed_nginx_version variable
+      set_fact:
+        sequenceserver_installed_nginx_version: "{{ get_nginx_version.stderr | regex_search('nginx/(?P<version>\\d+\\.\\d+\\.\\d+)', '\\g<version>') | first }}"
+
+    - name: Display installed NGINX version
+      ansible.builtin.debug:
+        var: sequenceserver_installed_nginx_version
+
+    - name: Uninstall Nginx
+      include_role:
+        name: nginxinc.nginx
+      vars:
+        nginx_setup: "uninstall"
+      when: sequenceserver_installed_nginx_version != sequenceserver_nginx_version
+
+  when: not get_nginx_version.failed
+
 - name: Install Nginx
   include_role:
     name: nginxinc.nginx
+  vars:
+    nginx_version: "={{ sequenceserver_nginx_version }}-1~focal"
 
 # NGINX LDAP authentication
 
@@ -19,16 +49,6 @@
 - name: Install the nginx-ldap-auth module when not present
   block:
 
-    - name: Get installed Nginx version
-      command:
-        cmd: nginx -v
-      register: get_nginx_version
-      check_mode: no
-
-    - name: Set sequenceserver_nginx_version variable
-      set_fact:
-        sequenceserver_nginx_version: "{{ get_nginx_version.stderr | regex_search('nginx/(?P<version>\\d+\\.\\d+\\.\\d+)', '\\g<version>') | first }}"
-
     - name: Create directory for nginx related sources if it does not exist
       file:
         path: "{{ sequenceserver_nginx_loaded_sources_path }}"