diff --git a/py/plugins/evaluators/pyproject.toml b/py/plugins/evaluators/pyproject.toml
index f02bac24dc..903cf0caec 100644
--- a/py/plugins/evaluators/pyproject.toml
+++ b/py/plugins/evaluators/pyproject.toml
@@ -30,7 +30,12 @@ classifiers = [
   "Topic :: Scientific/Engineering :: Artificial Intelligence",
   "Topic :: Software Development :: Libraries",
 ]
-dependencies = ["genkit", "jsonata-python>=0.5.3", "pydantic>=2.10.5"]
+dependencies = [
+    "genkit",
+    "jsonata-python>=0.5.3",
+    "pydantic>=2.10.5",
+    "strenum>=0.4.15; python_version < '3.11'",
+]
 description = "Genkit Evaluators Plugin for RAGAS"
 license = { text = "Apache-2.0" }
 name = "genkit-plugin-evaluators"
diff --git a/py/plugins/evaluators/src/genkit/plugins/evaluators/constant.py b/py/plugins/evaluators/src/genkit/plugins/evaluators/constant.py
index e0e894abcc..c3ca5bdb62 100644
--- a/py/plugins/evaluators/src/genkit/plugins/evaluators/constant.py
+++ b/py/plugins/evaluators/src/genkit/plugins/evaluators/constant.py
@@ -16,7 +16,10 @@
 
 
 from collections.abc import Callable
-from enum import StrEnum
+try:
+    from enum import StrEnum
+except ImportError:
+    from strenum import StrEnum
 from typing import Any
 
 from pydantic import BaseModel, RootModel
diff --git a/py/uv.lock b/py/uv.lock
index 63dd9ea3c7..a0e588defe 100644
--- a/py/uv.lock
+++ b/py/uv.lock
@@ -1347,6 +1347,7 @@ dependencies = [
     { name = "genkit" },
     { name = "jsonata-python" },
     { name = "pydantic" },
+    { name = "strenum", marker = "python_full_version < '3.11'" },
 ]
 
 [package.metadata]
@@ -1354,6 +1355,7 @@ requires-dist = [
     { name = "genkit", editable = "packages/genkit" },
     { name = "jsonata-python", specifier = ">=0.5.3" },
     { name = "pydantic", specifier = ">=2.10.5" },
+    { name = "strenum", marker = "python_full_version < '3.11'", specifier = ">=0.4.15" },
 ]
 
 [[package]]