diff --git a/test/components/evaluators/test_context_relevance_evaluator.py b/test/components/evaluators/test_context_relevance_evaluator.py
index e62314440..c381aadba 100644
--- a/test/components/evaluators/test_context_relevance_evaluator.py
+++ b/test/components/evaluators/test_context_relevance_evaluator.py
@@ -80,7 +80,8 @@ class TestContextRelevanceEvaluator:
         assert component._chat_generator.client.api_key == "test-api-key"
         assert component._chat_generator.generation_kwargs == {"response_format": {"type": "json_object"}, "seed": 42}
 
-    def test_init_with_chat_generator(self):
+    def test_init_with_chat_generator(self, monkeypatch):
+        monkeypatch.setenv("OPENAI_API_KEY", "test-api-key")
         chat_generator = OpenAIChatGenerator(generation_kwargs={"response_format": {"type": "json_object"}, "seed": 42})
         component = ContextRelevanceEvaluator(chat_generator=chat_generator)
 
diff --git a/test/components/evaluators/test_faithfulness_evaluator.py b/test/components/evaluators/test_faithfulness_evaluator.py
index a2756c48d..f8edbe0ba 100644
--- a/test/components/evaluators/test_faithfulness_evaluator.py
+++ b/test/components/evaluators/test_faithfulness_evaluator.py
@@ -100,7 +100,8 @@ class TestFaithfulnessEvaluator:
         assert component._chat_generator.client.api_key == "test-api-key"
         assert component._chat_generator.generation_kwargs == {"response_format": {"type": "json_object"}, "seed": 42}
 
-    def test_init_with_chat_generator(self):
+    def test_init_with_chat_generator(self, monkeypatch):
+        monkeypatch.setenv("OPENAI_API_KEY", "test-api-key")
         chat_generator = OpenAIChatGenerator(generation_kwargs={"response_format": {"type": "json_object"}, "seed": 42})
         component = FaithfulnessEvaluator(chat_generator=chat_generator)
 
diff --git a/test/utils/test_deserialization.py b/test/utils/test_deserialization.py
index cf5a5b39e..9f58079be 100644
--- a/test/utils/test_deserialization.py
+++ b/test/utils/test_deserialization.py
@@ -98,7 +98,8 @@ class TestDeserializeDocumentStoreInInitParamsInplace:
 
 
 class TestDeserializeChatGeneratorInplace:
-    def test_deserialize_chatgenerator_inplace(self):
+    def test_deserialize_chatgenerator_inplace(self, monkeypatch):
+        monkeypatch.setenv("OPENAI_API_KEY", "test-api-key")
         chat_generator = OpenAIChatGenerator()
         data = {"chat_generator": chat_generator.to_dict()}