diff --git a/requirements-cwl.txt b/requirements-cwl.txt
index d978e83b16..fd511727cf 100644
--- a/requirements-cwl.txt
+++ b/requirements-cwl.txt
@@ -2,7 +2,7 @@ cwltool==3.1.20231020140205
 schema-salad>=8.4.20230128170514,<9
 galaxy-tool-util<23
 galaxy-util<23
-ruamel.yaml>=0.15,<=0.18.3
+ruamel.yaml>=0.15,<=0.18.4
 ruamel.yaml.clib>=0.2.6
 networkx>=2,<2.8.9
 CacheControl[filecache]
diff --git a/requirements-server.txt b/requirements-server.txt
index 200d435f42..2ef1c17aa3 100644
--- a/requirements-server.txt
+++ b/requirements-server.txt
@@ -5,4 +5,4 @@ flask-cors==4.0.0
 gunicorn==21.2.0
 celery>=5.1.0, <6
 wes-service>=4.0.0, <5
-ruamel.yaml>=0.15,<0.18.4
+ruamel.yaml>=0.15,<0.18.5