diff --git a/requirements.txt b/requirements.txt
index 95f2eb49..39b84933 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,6 @@
 yarl==1.3.0  # yarl 1.4+ requires Python 3.6+ (needed by aiohttp and aiohttp-cors)
-jsonschema==2.6.0  # pyup: ignore
+jsonschema==3.2.0
+jsonschema==2.6.0; sys.platform == 'win32' or sys.platform == 'darwin'  # pyup: ignore (force jsonschema 2.6.0 on Windows and macOS)
 aiohttp==3.6.2
 aiohttp-cors==0.7.0
 aiofiles==0.4.0