diff --git a/libbeat/tests/system/requirements.txt b/libbeat/tests/system/requirements.txt
index a9df181606d..8bdb021e8ec 100644
--- a/libbeat/tests/system/requirements.txt
+++ b/libbeat/tests/system/requirements.txt
@@ -45,7 +45,7 @@ packaging==20.4
 parameterized==0.7.0
 paramiko==3.4.0
 pluggy==0.13.1
-protobuf==3.19.4
+protobuf==3.19.5
 py==1.11.0
 pycodestyle==2.6.0
 pycparser==2.21
diff --git a/libbeat/tests/system/requirements_aix.txt b/libbeat/tests/system/requirements_aix.txt
index a9df181606d..8bdb021e8ec 100644
--- a/libbeat/tests/system/requirements_aix.txt
+++ b/libbeat/tests/system/requirements_aix.txt
@@ -45,7 +45,7 @@ packaging==20.4
 parameterized==0.7.0
 paramiko==3.4.0
 pluggy==0.13.1
-protobuf==3.19.4
+protobuf==3.19.5
 py==1.11.0
 pycodestyle==2.6.0
 pycparser==2.21