diff --git a/setup.py b/setup.py
index 49b2cb9c..9bc6796e 100644
--- a/setup.py
+++ b/setup.py
@@ -16,7 +16,10 @@ import octoprint_setuptools
 INSTALL_REQUIRES = [
 	"flask>=0.9,<0.11",
 	"werkzeug>=0.8.3,<0.9",
-	"tornado>=4.0.2,<4.1",
+	"tornado==4.0.2", # pinned for now, we need to migrate to a newer tornado, but due
+	                  # to some voodoo needed to get large streamed uploads and downloads
+	                  # to work that is probably not completely straightforward and therefore
+	                  # something for post-1.3.0-stable release
 	"sockjs-tornado>=1.0.2,<1.1",
 	"PyYAML>=3.10,<3.11",
 	"Flask-Login>=0.2.2,<0.3",