diff --git a/mastodon_email_bridge/mastodon_email_bridge.py b/mastodon_email_bridge/mastodon_email_bridge.py
index ee76160..93b438d 100755
--- a/mastodon_email_bridge/mastodon_email_bridge.py
+++ b/mastodon_email_bridge/mastodon_email_bridge.py
@@ -75,10 +75,10 @@ class MastodonEmailBridge:
             autoescape=select_autoescape()
         )
         self.translate_session = requests.Session()
-        headers = [
-            'accept: application/json',
-            'Content-Type: application/x-www-form-urlencoded',
-        ]
+        headers = {
+            'accept': 'application/json',
+            'Content-Type': 'application/x-www-form-urlencoded',
+        }
         self.translate_session.headers.update(headers)
         self.session = requests.Session()
         self.session.headers.update({'Authorization': f"Bearer {self.config['token']}"})