diff --git a/.circleci/report_nightly_build_failure.py b/.circleci/report_nightly_build_failure.py
index ef54fe5..bfd1a5d 100644
--- a/.circleci/report_nightly_build_failure.py
+++ b/.circleci/report_nightly_build_failure.py
@@ -3,16 +3,23 @@
 
 This reports an error to the #nightly-build-failures Slack channel.
 """
+
 import os
+
 import requests
 
-if 'SLACK_WEBHOOK_URL' in os.environ:
+if "SLACK_WEBHOOK_URL" in os.environ:
     print("Reporting to #nightly-build-failures slack channel")
-    response = requests.post(os.environ['SLACK_WEBHOOK_URL'], json={
-        "text": "A Nightly build failed. See " + os.environ['CIRCLE_BUILD_URL'],
-    })
+    response = requests.post(
+        os.environ["SLACK_WEBHOOK_URL"],
+        json={
+            "text": "A Nightly build failed. See " + os.environ["CIRCLE_BUILD_URL"],
+        },
+    )
 
     print("Slack responded with:", response)
 
 else:
-    print("Unable to report to #nightly-build-failures slack channel because SLACK_WEBHOOK_URL is not set")
+    print(
+        "Unable to report to #nightly-build-failures slack channel because SLACK_WEBHOOK_URL is not set"
+    )