diff --git a/tests/cassettes/test_anthropic/test_anthropic_chat.yaml b/tests/cassettes/test_anthropic/test_anthropic_chat.yaml
index 31af921..9e53a28 100644
--- a/tests/cassettes/test_anthropic/test_anthropic_chat.yaml
+++ b/tests/cassettes/test_anthropic/test_anthropic_chat.yaml
@@ -38,18 +38,15 @@ interactions:
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-      - '2024-03-15T14:53:00Z'
+      - '2024-03-21T18:35:00Z'
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       anthropic-ratelimit-tokens-remaining:
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-      - '2024-03-15T14:53:00Z'
+      - '2024-03-21T18:35:00Z'
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diff --git a/tests/cassettes/test_mistralai/test_mistralai_chat.yaml b/tests/cassettes/test_mistralai/test_mistralai_chat.yaml
index 285a40f..4f8534e 100644
--- a/tests/cassettes/test_mistralai/test_mistralai_chat.yaml
+++ b/tests/cassettes/test_mistralai/test_mistralai_chat.yaml
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-      - '1905656'
+      - '1967997'
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-      - '59'
+      - '54'
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       message: OK
diff --git a/tests/cassettes/test_openai/test_openai_chat.yaml b/tests/cassettes/test_openai/test_openai_chat.yaml
index 279aaf5..54848ea 100644
--- a/tests/cassettes/test_openai/test_openai_chat.yaml
+++ b/tests/cassettes/test_openai/test_openai_chat.yaml
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diff --git a/tests/conftest.py b/tests/conftest.py
index 75778e8..3cbe748 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,8 +1,17 @@
+import os
+
 import pytest
 
 from genai_impact import Tracer
 
 
+@pytest.fixture(autouse=True)
+def environment():
+    os.environ["ANTHROPIC_API_KEY"] = "test-api-key"
+    os.environ["MISTRAL_API_KEY"] = "test-api-key"
+    os.environ["OPENAI_API_KEY"] = "test-api-key"
+
+
 @pytest.fixture(scope="session")
 def vcr_config():
     return {"filter_headers": [