diff --git a/python-httpbin.spec b/python-httpbin.spec
index 8afa248..512d67c 100644
--- a/python-httpbin.spec
+++ b/python-httpbin.spec
@@ -43,6 +43,7 @@ Requires:       python-Brotli
 Requires:       python-Flask
 Requires:       python-MarkupSafe
 Requires:       python-Werkzeug >= 0.14.1
+Requires:       python-blinker
 Requires:       python-decorator
 Requires:       python-flasgger
 Requires:       python-gevent