diff --git a/dd-sso/docker/api/requirements.pip3 b/dd-sso/docker/api/requirements.pip3
index ece5a5a..b9177ad 100644
--- a/dd-sso/docker/api/requirements.pip3
+++ b/dd-sso/docker/api/requirements.pip3
@@ -20,4 +20,8 @@
 Flask==2.0.1
 eventlet==0.33.0
 Flask-SocketIO==5.1.0
-python-keycloak==0.26.1
\ No newline at end of file
+# Flask-SocketIO depends on dnspython
+# but dnspython 2.3 removes dns.rdtypes.ANY, which is needed by Flask-SocketIO
+# so we keep it below version 2.3
+dnspython<2.3
+python-keycloak==0.26.1