diff --git a/src/speckle_automate/fixtures.py b/src/speckle_automate/fixtures.py
index 5e92974..04e01d4 100644
--- a/src/speckle_automate/fixtures.py
+++ b/src/speckle_automate/fixtures.py
@@ -22,10 +22,10 @@ class TestAutomationEnvironment(BaseSettings):
         extra="ignore",
     )
 
-    token: str = Field()
-    server_url: str = Field()
-    project_id: str = Field()
-    automation_id: str = Field()
+    token: str = Field(default="")
+    server_url: str = Field(default="")
+    project_id: str = Field(default="")
+    automation_id: str = Field(default="")
 
 
 @pytest.fixture()