diff --git a/tests/__init__.py b/tests/__init__.py
index 8b137891..eb69e9ce 100755
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -1 +1,11 @@
+"""Securesystemslib tests.
 
+NOTE: This file is only considered when running tests via aggregate_tests.py, or
+with the '-m' flag, when invoked individually.
+
+"""
+
+# Increase gpg subprocess timeout -- Windows CI fails frequently with default 10s.
+import securesystemslib.gpg.constants
+
+securesystemslib.gpg.constants.GPG_TIMEOUT = 120