diff --git a/.gitleaks.toml b/.gitleaks.toml
index 0eec3f1ae..8543c9666 100644
--- a/.gitleaks.toml
+++ b/.gitleaks.toml
@@ -35,3 +35,15 @@ regexTarget = "secret"
 regexes = [
   '''^7abc5b334a6c3c52dd3eba15d8bc516da728a67f14fb7f56d0bb5992d89a16ca$''',
 ]
+
+[[allowlists]]
+description = "Synthetic dummy API key in trace artifact sanitizer test fixture"
+targetRules = ["generic-api-key"]
+condition = "AND"
+paths = [
+  '''(?:^|/)tests/test_trace_artifact_sanitizer\.py$''',
+]
+regexTarget = "secret"
+regexes = [
+  '''^sk-123456789$''',
+]