diff --git a/dev-requirements.txt b/dev-requirements.txt
index 82374d2..1f3594e 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -1,4 +1,4 @@
-coverage==4.4
+coverage==4.4.1
 mock==2.0.0
 nose==1.3.7
 nose-capturestderr==1.2
diff --git a/wakatime/constants.py b/wakatime/constants.py
index ae71737..3e1905f 100644
--- a/wakatime/constants.py
+++ b/wakatime/constants.py
@@ -39,6 +39,12 @@ Exit code used when the JSON input from `--extra-heartbeats` is malformed.
 """
 MALFORMED_HEARTBEAT_ERROR = 106
 
+""" Connection Error
+Exit code used when there was proxy or other problem connecting to the WakaTime
+API servers.
+"""
+CONNECTION_ERROR = 107
+
 """ Max file size supporting line number count stats.
 Files larger than this in bytes will not have a line count stat for performance.
 Default is 2MB.