diff --git a/requirements-dev.txt b/requirements-dev.txt
index 67d95d8..b758140 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -44,5 +44,5 @@
     # via
     #   -r https://osm.etsi.org/gitweb/?p=osm/common.git;a=blob_plain;f=requirements.txt;hb=paas
     #   motor
-pyyaml==5.4.1
+pyyaml==5.3.1
     # via -r https://osm.etsi.org/gitweb/?p=osm/common.git;a=blob_plain;f=requirements.txt;hb=paas
diff --git a/requirements.in b/requirements.in
index c083f65..2264fa2 100644
--- a/requirements.in
+++ b/requirements.in
@@ -16,7 +16,7 @@
 aiokafka
 peewee
 jsonschema
-pyyaml==5.4.1
+pyyaml==5.3.1
 pymysql
 peewee-migrate
 requests
diff --git a/requirements.txt b/requirements.txt
index 1690bf4..7e85be9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -44,7 +44,7 @@
     # via -r requirements.in
 pyrsistent==0.19.3
     # via jsonschema
-pyyaml==5.4.1
+pyyaml==5.3.1
     # via -r requirements.in
 requests==2.30.0
     # via -r requirements.in