diff --git a/2021/Flynn b/2021/Flynn
index f45ba77..30bb955 160000
--- a/2021/Flynn
+++ b/2021/Flynn
@@ -1 +1 @@
-Subproject commit f45ba77362592f58c7f3077d8c941e653d30ad4e
+Subproject commit 30bb95515a022b10ccc26dfb0a13af6e603caab9
diff --git a/2021/chvp b/2021/chvp
index 0f67b76..02f81ac 160000
--- a/2021/chvp
+++ b/2021/chvp
@@ -1 +1 @@
-Subproject commit 0f67b7634bb30914287664bdf4f1f975269fe095
+Subproject commit 02f81ac987ba0d00af576a477e78652505acd832
diff --git a/2021/rien b/2021/rien
index 4539030..14f71ed 160000
--- a/2021/rien
+++ b/2021/rien
@@ -1 +1 @@
-Subproject commit 4539030bbfdf78211f5dd0b6c22d464d4eeb2402
+Subproject commit 14f71edc265fbfc16ea92d98662e79961c15aabb
diff --git a/2021/robbe b/2021/robbe
index 6a307ca..189a0a7 160000
--- a/2021/robbe
+++ b/2021/robbe
@@ -1 +1 @@
-Subproject commit 6a307ca5fce99e3f838750c5a8bd82c5bd356778
+Subproject commit 189a0a7b0af07b87a18198c357f38a3c05c2ec1a