diff --git a/docs/source/simulation_components/system/ntp_client_server.rst b/docs/source/simulation_components/system/ntp_client_server.rst
index 671126fb..b6d57c13 100644
--- a/docs/source/simulation_components/system/ntp_client_server.rst
+++ b/docs/source/simulation_components/system/ntp_client_server.rst
@@ -22,7 +22,7 @@ Key capabilities
 Usage
 ^^^^^
 - Install on a Node via the ``SoftwareManager`` to start the database service.
-- Service runs on TCP port 123 by default.
+- Service runs on UDP port 123 by default.
 
 Implementation
 ^^^^^^^^^^^^^^
@@ -44,7 +44,7 @@ Usage
 ^^^^^
 
 - Install on a Node via the ``SoftwareManager`` to start the database service.
-- Service runs on TCP port 123 by default.
+- Service runs on UDP port 123 by default.
 
 Implementation
 ^^^^^^^^^^^^^^
diff --git a/src/primaite/simulator/system/services/ntp/ntp_client.py b/src/primaite/simulator/system/services/ntp/ntp_client.py
index ddd794ae..43d1d783 100644
--- a/src/primaite/simulator/system/services/ntp/ntp_client.py
+++ b/src/primaite/simulator/system/services/ntp/ntp_client.py
@@ -21,7 +21,7 @@ class NTPClient(Service):
     def __init__(self, **kwargs):
         kwargs["name"] = "NTPClient"
         kwargs["port"] = Port.NTP
-        kwargs["protocol"] = IPProtocol.TCP
+        kwargs["protocol"] = IPProtocol.UDP
         super().__init__(**kwargs)
         self.start()
 
diff --git a/src/primaite/simulator/system/services/ntp/ntp_server.py b/src/primaite/simulator/system/services/ntp/ntp_server.py
index 3987fa2c..3ae80936 100644
--- a/src/primaite/simulator/system/services/ntp/ntp_server.py
+++ b/src/primaite/simulator/system/services/ntp/ntp_server.py
@@ -16,7 +16,7 @@ class NTPServer(Service):
     def __init__(self, **kwargs):
         kwargs["name"] = "NTPServer"
         kwargs["port"] = Port.NTP
-        kwargs["protocol"] = IPProtocol.TCP
+        kwargs["protocol"] = IPProtocol.UDP
         super().__init__(**kwargs)
         self.start()