diff --git a/muted-tests.yml b/muted-tests.yml
index 55dc8f8104f7d..af561d3200e98 100644
--- a/muted-tests.yml
+++ b/muted-tests.yml
@@ -392,6 +392,9 @@ tests:
 - class: org.elasticsearch.test.rest.ClientYamlTestSuiteIT
   method: test {yaml=update/100_synthetic_source/stored text}
   issue: https://github.com/elastic/elasticsearch/issues/121964
+- class: org.elasticsearch.test.rest.ClientYamlTestSuiteIT
+  method: test {yaml=update/100_synthetic_source/keyword}
+  issue: https://github.com/elastic/elasticsearch/issues/121965
 
 # Examples:
 #