diff --git a/competitions/__init__.py b/competitions/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/competitions/data.py b/competitions/data.py
new file mode 100644
index 0000000..84cc388
--- /dev/null
+++ b/competitions/data.py
@@ -0,0 +1,16 @@
+from enum import IntEnum
+
+
+class CompetitionId(IntEnum):
+    """Unique identifiers for each competition."""
+
+    B7_MODEL = 0
+
+    M772_MODEL = 1
+
+    B3_MODEL = 2
+
+    # Overwrite the default __repr__, which doesn't work with
+    # bt.logging for some unknown reason.
+    def __repr__(self) -> str:
+        return f"{self.value}"
diff --git a/constants/__init__.py b/constants/__init__.py
index 8ff0d3e..f945313 100644
--- a/constants/__init__.py
+++ b/constants/__init__.py
@@ -35,7 +35,7 @@
 # ---------------------------------
 
 # Release
-__version__ = "4.0.0"
+__version__ = "4.0.1"
 
 # Validator schema version
 __validator_version__ = "3.0.0"