diff --git a/roles/service/meta/argument_specs.yaml b/roles/service/meta/argument_specs.yaml
index 796d2c5..de9a857 100644
--- a/roles/service/meta/argument_specs.yaml
+++ b/roles/service/meta/argument_specs.yaml
@@ -113,6 +113,14 @@ argument_specs:
             description: Container port to publish
             type: int
             required: true
+          protocol:
+            description: Protocol of the port
+            type: str
+            required: false
+            default: tcp
+            choices:
+              - tcp
+              - udp
           type:
             description: Whether to publish as a port or socket
             type: str
@@ -495,6 +503,14 @@ argument_specs:
                 description: Container port to publish
                 type: int
                 required: true
+              protocol:
+                description: Protocol of the port
+                type: str
+                required: false
+                default: tcp
+                choices:
+                  - tcp
+                  - udp
               type:
                 description: Whether to publish as a port or socket
                 type: str
diff --git a/roles/service/vars/main/additional.yaml b/roles/service/vars/main/additional.yaml
index 2d6cd00..4c1dd68 100644
--- a/roles/service/vars/main/additional.yaml
+++ b/roles/service/vars/main/additional.yaml
@@ -152,6 +152,7 @@ _service_additional_container_publish_ports: >-
       _service_additional_container_publish_port_ports | map(attribute='host_port'),
       _service_additional_container_publish_port_ports | map(attribute='container_port')
     ) | map('join', ':')
+    | zip(_service_additional_container_publish_port_ports | map(attribute='protocol')) | map('join', '/')
   }}
 
 _service_additional_volume_mounts: "{{ _service_additional_container.mounts | selectattr('type', '==', 'volume') }}"
diff --git a/roles/service/vars/main/publish_ports.yaml b/roles/service/vars/main/publish_ports.yaml
index fce6ef4..a777cf2 100644
--- a/roles/service/vars/main/publish_ports.yaml
+++ b/roles/service/vars/main/publish_ports.yaml
@@ -1,7 +1,7 @@
 ---
 _service_container_publish_ports_with_defaults: >-
   {{
-    ([{ 'type': 'port', 'host_address': '0.0.0.0' }] * service_container_publish_ports | length)
+    ([{ 'type': 'port', 'host_address': '0.0.0.0', 'protocol': 'tcp' }] * service_container_publish_ports | length)
     | zip(service_container_publish_ports)
     | map('combine')
   }}
@@ -13,9 +13,10 @@ _service_container_publish_port_ports: >-
 
 _service_container_publish_ports: >-
   {{
-    _service_container_publish_port_ports | map(attribute='host_address') |
-    zip(
+    _service_container_publish_port_ports | map(attribute='host_address')
+    | zip(
       _service_container_publish_port_ports | map(attribute='host_port'),
       _service_container_publish_port_ports | map(attribute='container_port')
     ) | map('join', ':')
+    | zip(_service_container_publish_port_ports | map(attribute='protocol')) | map('join', '/')
   }}