diff --git a/src/crewai/evaluation/experiment/runner.py b/src/crewai/evaluation/experiment/runner.py
index 6422a772f..4cd818ec3 100644
--- a/src/crewai/evaluation/experiment/runner.py
+++ b/src/crewai/evaluation/experiment/runner.py
@@ -34,7 +34,7 @@ class ExperimentRunner:
     def _run_test_case(self, test_case: Dict[str, Any], crew: Crew) -> ExperimentResult:
         inputs = test_case["inputs"]
         expected_score = test_case["expected_score"]
-        identifier = test_case.get("identifier") or md5(str(test_case), usedforsecurity=False).hexdigest()
+        identifier = test_case.get("identifier") or md5(str(test_case).encode(), usedforsecurity=False).hexdigest()
 
         try:
             self.display.console.print(f"[dim]Running crew with input: {str(inputs)[:50]}...[/dim]")
diff --git a/tests/evaluation/test_experiment_runner.py b/tests/evaluation/test_experiment_runner.py
index 52eefeef5..f7e4b2699 100644
--- a/tests/evaluation/test_experiment_runner.py
+++ b/tests/evaluation/test_experiment_runner.py
@@ -58,7 +58,6 @@ class TestExperimentRunner:
                 "expected_score": {"goal_alignment": 7}
             },
             {
-                "identifier": "test-case-3",
                 "inputs": {"query": "Test query 3"},
                 "expected_score": {"tool_selection": 9}
             }
@@ -88,7 +87,7 @@ class TestExperimentRunner:
         assert "goal_alignment" in result_2.expected_score
         assert result_2.passed is True
 
-        assert result_3.identifier == "test-case-3"
+        assert result_3.identifier == "c2ed49e63aa9a83af3ca382794134fd5"
         assert result_3.inputs == {"query": "Test query 3"}
         assert isinstance(result_3.expected_score, dict)
         assert "tool_selection" in result_3.expected_score