diff --git a/elasticache.tf b/elasticache.tf
index 76d0152..6bd0a2b 100644
--- a/elasticache.tf
+++ b/elasticache.tf
@@ -25,7 +25,7 @@ resource "aws_security_group" "elasticache" {
 resource "aws_elasticache_cluster" "this" {
   cluster_id           = "${var.prefix}-elasticache-cluster-${var.environment}"
   engine               = "memcached"
-  engine_version       = "1.6.6"
+  engine_version       = "1.6.22"
   node_type            = "cache.t2.micro"
   num_cache_nodes      = 2
   parameter_group_name = "default.memcached1.6"