diff --git a/Dockerfile b/Dockerfile
index 19160ac23..57ad25ee0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.7.5-alpine3.15
+FROM ruby:2.7.5-alpine3.13
 LABEL Ministry of Justice, LAA Get Paid <laa-get-paid@digital.justice.gov.uk>
 
 # fail early and print all commands
diff --git a/docker/Dockerfile b/docker/Dockerfile
index 3c2cd5673..aba4a10e1 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.7.5-alpine
+FROM ruby:2.7.5-alpine3.13
 LABEL Organisation="Ministry of Justice"
 LABEL Team="LAA Get Paid"
 LABEL Contact="<laa-get-paid@digital.justice.gov.uk>"