diff --git a/CHANGELOG.md b/CHANGELOG.md
index bdc78dd..b5112fa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,10 @@ use patch releases for compatibility fixes instead.
 
 ## Unreleased
 
+### Added
+
+- Added `hostname` constraint.
+
 ## [v1.18.6](https://github.com/allenai/beaker-py/releases/tag/v1.18.6) - 2023-06-02
 
 ### Fixed
diff --git a/beaker/data_model/experiment_spec.py b/beaker/data_model/experiment_spec.py
index 415c756..ea55b97 100644
--- a/beaker/data_model/experiment_spec.py
+++ b/beaker/data_model/experiment_spec.py
@@ -296,6 +296,11 @@ class Constraints(BaseModel, frozen=False, extra="allow"):
     in which case the task will run on any cluster where you have permissions.
     """
 
+    hostname: Optional[List[str]] = None
+    """
+    Hostname constraints.
+    """
+
     def __setitem__(self, key: str, val: List[Any]) -> None:
         setattr(self, key, val)