diff --git a/crossbar-requirements.txt b/crossbar-requirements.txt
index 0afc9a143..35583573b 100644
--- a/crossbar-requirements.txt
+++ b/crossbar-requirements.txt
@@ -2,5 +2,5 @@
 setuptools>=38.0.0
 crossbar==20.12.3
 urllib3==1.24.3
-idna==2.5
+idna==3.2
 msgpack==1.0.0