diff --git a/install/requirements.txt b/install/requirements.txt
index b19e7fd7c..0fc4832fa 100644
--- a/install/requirements.txt
+++ b/install/requirements.txt
@@ -52,4 +52,4 @@ pyyaml
 pytest-asyncio
 vulture
 detect-secrets
-git+https://github.com/SECEF/python-idmefv2.git
+idmefv2==0.8
diff --git a/slips_files/common/idmefv2.py b/slips_files/common/idmefv2.py
index c946a6936..f512b832d 100644
--- a/slips_files/common/idmefv2.py
+++ b/slips_files/common/idmefv2.py
@@ -26,7 +26,7 @@ class IDMEFv2Status(Enum):
     ALERT = "Incident"
 
 
-class IDMEFv2Severity(Enum):
+class IDMEFv2PriorityEnum(Enum):
     UNKNOWN = "Unknown"
     INFO = "Info"
     LOW = "Low"
@@ -53,7 +53,7 @@ def __init__(self, logger: Output, db):
         self.model: str = utils.get_slips_version()
 
         # the used idmef version
-        self.version = "2.0.3"
+        self.version = "2.D.V03"
 
     def _get_analyzer(self, interface):
         return {
@@ -75,7 +75,7 @@ def get_host_ip(self, interface: str) -> str:
     def print(self, *args, **kwargs):
         return self.printer.print(*args, **kwargs)
 
-    def convert_threat_level_to_idmefv2_severity(
+    def convert_threat_level_to_idmefv2_priority(
         self, threat_lvl: ThreatLevel
     ) -> str:
         """
@@ -83,11 +83,12 @@ def convert_threat_level_to_idmefv2_severity(
         All threat levels have a corresponding sevirity except
         for the Critical threat level, so we map it to High severity
         """
-        if hasattr(IDMEFv2Severity, threat_lvl.name):
-            return getattr(IDMEFv2Severity, threat_lvl.name).value
+        if hasattr(IDMEFv2PriorityEnum, threat_lvl.name):
+            return getattr(IDMEFv2PriorityEnum, threat_lvl.name).value
 
         if threat_lvl.name == "CRITICAL":
-            return IDMEFv2Severity.HIGH.value
+            return IDMEFv2PriorityEnum.HIGH.value
+        return IDMEFv2PriorityEnum.UNKNOWN.value
 
     def extract_role_type(
         self, evidence: Evidence, role=None
@@ -111,6 +112,7 @@ def extract_role_type(
             IoCType.DOMAIN.name: "Hostname",
             IoCType.URL.name: "URL",
         }
+        ioc_type = ioc_type.name if isinstance(ioc_type, IoCType) else ioc_type
         # todo make sure that its a fq domain
         return ioc, type_[ioc_type]
 
@@ -195,7 +197,7 @@ def convert_to_idmef_event(self, evidence: Evidence) -> Message:
             attacker, attacker_type = self.extract_role_type(
                 evidence, role="attacker"
             )
-            severity: str = self.convert_threat_level_to_idmefv2_severity(
+            priority: str = self.convert_threat_level_to_idmefv2_priority(
                 evidence.threat_level
             )
 
@@ -207,7 +209,7 @@ def convert_to_idmef_event(self, evidence: Evidence) -> Message:
                     "Status": IDMEFv2Status.EVIDENCE.value,
                     # that is a uuid4()
                     "ID": evidence.id,
-                    "Severity": severity,
+                    "Priority": priority,
                     # Timestamp indicating the deduced start of the event
                     "StartTime": iso_ts,
                     # Timestamp indicating when the message was created
diff --git a/tests/unit/slips_files/common/test_idmefv2.py b/tests/unit/slips_files/common/test_idmefv2.py
new file mode 100644
index 000000000..fbf573437
--- /dev/null
+++ b/tests/unit/slips_files/common/test_idmefv2.py
@@ -0,0 +1,95 @@
+from unittest.mock import Mock, patch
+
+import pytest
+
+from slips_files.common.idmefv2 import IDMEFv2
+from slips_files.core.structures.evidence import (
+    Direction,
+    EvidenceType,
+    IoCType,
+    Proto,
+    ThreatLevel,
+)
+from tests.module_factory import ModuleFactory
+
+
+class MessageStub(dict):
+    """Minimal dict-like IDMEF message for converter unit tests."""
+
+    def validate(self) -> None:
+        """Skip external schema validation.
+
+        Return:
+            None.
+        """
+        return None
+
+
+@pytest.mark.parametrize(
+    "threat_level, expected_priority",
+    [
+        (ThreatLevel.INFO, "Info"),
+        (ThreatLevel.LOW, "Low"),
+        (ThreatLevel.MEDIUM, "Medium"),
+        (ThreatLevel.HIGH, "High"),
+        (ThreatLevel.CRITICAL, "High"),
+    ],
+)
+def test_convert_threat_level_to_idmefv2_priority(
+    threat_level: ThreatLevel, expected_priority: str
+) -> None:
+    """Verify Slips threat levels map to IDMEFv2 priority values.
+
+    Parameters:
+        threat_level: Slips threat level to convert.
+        expected_priority: Expected IDMEFv2 priority string.
+
+    Return:
+        None.
+    """
+    module_factory = ModuleFactory()
+    idmefv2 = IDMEFv2(module_factory.logger, Mock())
+
+    assert (
+        idmefv2.convert_threat_level_to_idmefv2_priority(threat_level)
+        == expected_priority
+    )
+
+
+def test_convert_to_idmef_event_uses_priority_field() -> None:
+    """Verify converted IDMEFv2 events use Priority instead of Severity.
+
+    Return:
+        None.
+    """
+    module_factory = ModuleFactory()
+    db = Mock()
+    db.is_running_non_stop.return_value = False
+    idmefv2 = IDMEFv2(module_factory.logger, db)
+    attacker = module_factory.create_attacker_obj(
+        value="192.168.1.1", direction=Direction.SRC, ioc_type=IoCType.IP
+    )
+    victim = module_factory.create_victim_obj(
+        value="192.168.1.2", direction=Direction.DST, ioc_type=IoCType.IP
+    )
+    evidence = module_factory.create_evidence_obj(
+        evidence_type=EvidenceType.ARP_SCAN,
+        description="ARP scan detected",
+        attacker=attacker,
+        threat_level=ThreatLevel.MEDIUM,
+        victim=victim,
+        profile=module_factory.create_profileid_obj(ip="192.168.1.1"),
+        timewindow=module_factory.create_timewindow_obj(number=1),
+        uid=["uid1"],
+        timestamp="2023/10/26 10:10:10.000000+0000",
+        proto=Proto.TCP,
+        dst_port=80,
+        id="d4afbe1a-1cb9-4db4-9fac-74f2da6f5f34",
+        confidence=0.8,
+    )
+
+    with patch("slips_files.common.idmefv2.Message", MessageStub):
+        event = idmefv2.convert_to_idmef_event(evidence)
+
+    assert event["Priority"] == "Medium"
+    assert "Severity" not in event