diff --git a/WriteToMongo b/WriteToMongo
index 5a48370..c74bc89 160000
--- a/WriteToMongo
+++ b/WriteToMongo
@@ -1 +1 @@
-Subproject commit 5a483700b9463acaa38dc50230515c53aa509521
+Subproject commit c74bc894cd4922ff8eb7bfc8d9bcf836c5c89b8a
diff --git a/docker-compose.yml b/docker-compose.yml
index b6436f8..233b89b 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -96,7 +96,7 @@ services:
       options:
         fluentd-async-connect: "true"
         tag: mongo.mongodb
-    image: mongo
+    image: mongo:4.4.9
     expose:
       - 27017
     ports:
diff --git a/dummyservice b/dummyservice
index b67f60b..1ac7213 160000
--- a/dummyservice
+++ b/dummyservice
@@ -1 +1 @@
-Subproject commit b67f60bbed66e8b4198a549a6600ae11e861bbde
+Subproject commit 1ac721330ee55356c6f8d8ab20eeb52957c3aea5
diff --git a/playground-client b/playground-client
index 5be6c55..b797d10 160000
--- a/playground-client
+++ b/playground-client
@@ -1 +1 @@
-Subproject commit 5be6c5580d704c57798676d2b463ee1eba22e0a8
+Subproject commit b797d1044cf18e8173e1cfbe39db8c644e33ccb2
diff --git a/readmongo b/readmongo
index 8a9a6bd..d3ea40b 160000
--- a/readmongo
+++ b/readmongo
@@ -1 +1 @@
-Subproject commit 8a9a6bd8da5cf8fc2850dfa7684bc98e5f043ddf
+Subproject commit d3ea40b69f82a18bb4ceae42d22aa2a01dcbb069