diff --git a/roles/tx_submit_api/defaults/main.yml b/roles/tx_submit_api/defaults/main.yml
index a9d2def..bae8bfc 100644
--- a/roles/tx_submit_api/defaults/main.yml
+++ b/roles/tx_submit_api/defaults/main.yml
@@ -3,7 +3,7 @@
 tx_submit_api_install_method: 'docker'
 
 # Cardano Submit API version
-tx_submit_api_version: '0.17.5'
+tx_submit_api_version: '0.18.0'
 
 # Base host directory for node data
 cardano_node_dir: /opt/cardano
@@ -32,3 +32,9 @@ tx_submit_api_metrics_port: '{{ tx_submit_api_metrics_container_port }}'
 
 # Cardano network
 tx_submit_api_network: mainnet
+
+# SSL certificate and key (optional)
+tx_submit_api_tls_cert_file_path: ''
+tx_submit_api_tls_cert_file_container_path: '{{ tx_submit_api_tls_cert_file_path }}'
+tx_submit_api_tls_key_file_path: ''
+tx_submit_api_tls_key_file_container_path: '{{ tx_submit_api_tls_key_file_path }}'
diff --git a/roles/tx_submit_api/tasks/docker.yml b/roles/tx_submit_api/tasks/docker.yml
index c4a0d42..69f2cf3 100644
--- a/roles/tx_submit_api/tasks/docker.yml
+++ b/roles/tx_submit_api/tasks/docker.yml
@@ -1,4 +1,18 @@
 ---
+- name: Initialize tx_submit_api_docker_volumes fact
+  set_fact:
+    tx_submit_api_docker_volumes: '{{ tx_submit_api_docker_volumes | default([]) + [item] }}'
+  loop:
+    - '{{ cardano_node_ipc_dir }}:{{ tx_submit_api_ipc_container_dir }}'
+
+- name: Add tls certificate to tx_submit_api_docker_volumes fact
+  set_fact:
+    tx_submit_api_docker_volumes: '{{ tx_submit_api_docker_volumes | default([]) + [item] }}'
+  loop:
+    - '{{ tx_submit_api_tls_cert_file_path }}:{{ tx_submit_api_tls_cert_file_container_path }}'
+    - '{{ tx_submit_api_tls_key_file_path }}:{{ tx_submit_api_tls_key_file_container_path }}'
+  when: tx_submit_api_tls_cert_file_path != '' and tx_submit_api_tls_key_file_path != ''
+
 - name: Create container
   docker_container:
     name: '{{ tx_submit_api_docker_container_name }}'
@@ -9,5 +23,6 @@
       - '{{ tx_submit_api_metrics_port }}:{{ tx_submit_api_metrics_container_port }}'
     env:
       CARDANO_NETWORK: '{{ tx_submit_api_network }}'
-    volumes:
-      - '{{ cardano_node_ipc_dir }}:{{ tx_submit_api_ipc_container_dir }}'
+      TLS_CERT_FILE_PATH: '{{ tx_submit_api_tls_cert_file_path | string }}'
+      TLS_KEY_FILE_PATH: '{{ tx_submit_api_tls_key_file_path | string }}'
+    volumes: '{{ tx_submit_api_docker_volumes | list }}'