diff --git a/setup.py b/setup.py
index 3b3c3fd9..7a851c21 100644
--- a/setup.py
+++ b/setup.py
@@ -25,7 +25,7 @@
     include_package_data=True,
     zip_safe=False,
     install_requires=[
-        'pyyaml',
+        'pyyaml==5.4',
         'ckanapi',
         'ckantoolkit>=0.0.2',
         'pytz',