diff --git a/ci/requirements.txt b/ci/requirements.txt
index 368c35173..33262c385 100644
--- a/ci/requirements.txt
+++ b/ci/requirements.txt
@@ -1,5 +1,6 @@
 c2cciutils==1.2.14
 node_vm2==0.4.5 # Pin because version 0.4.7 is not working
+ruamel.yaml==0.17.40 # Pin because version 0.18.* is not working
 tomlkit==0.11.8
 setuptools>=65.5.1 # not directly required, pinned by Snyk to avoid a vulnerability
 protobuf>=3.18.3 # not directly required, pinned by Snyk to avoid a vulnerability