diff --git a/requirements-nfse.txt b/requirements-nfse.txt
index a203ffa..582da17 100644
--- a/requirements-nfse.txt
+++ b/requirements-nfse.txt
@@ -1,3 +1,3 @@
 # Opcional para NFS-e
 suds-jurko
-pyxb
+pyxb=1.2.4