diff --git a/2021/chvp b/2021/chvp
index 2959dd0..aec3906 160000
--- a/2021/chvp
+++ b/2021/chvp
@@ -1 +1 @@
-Subproject commit 2959dd0a743ae9cccd03889c40fabfde5b6ae577
+Subproject commit aec39063e14d5181de45500ecee13cb65781aa65
diff --git a/2021/jaspervdj b/2021/jaspervdj
index 464d098..2795c41 160000
--- a/2021/jaspervdj
+++ b/2021/jaspervdj
@@ -1 +1 @@
-Subproject commit 464d09894f4617f3070339bd3a4131049c81e5d4
+Subproject commit 2795c41f55b6cb9dfa05d49d15c53fe2aeb9afcd
diff --git a/2021/ninewise b/2021/ninewise
index 3a13913..60ed698 160000
--- a/2021/ninewise
+++ b/2021/ninewise
@@ -1 +1 @@
-Subproject commit 3a13913e7408be208ac6fd6394c30e223539204a
+Subproject commit 60ed6981b89058cb57d46f5a4c354c102be330a9
diff --git a/2021/robbe b/2021/robbe
index 950a0f9..704cdc6 160000
--- a/2021/robbe
+++ b/2021/robbe
@@ -1 +1 @@
-Subproject commit 950a0f9c4a83efc24e599066f9187c1751dfb915
+Subproject commit 704cdc66e4e75afd89b4e681a34945b39474d815
diff --git a/2021/silvius b/2021/silvius
index b8b1e27..d535d8d 160000
--- a/2021/silvius
+++ b/2021/silvius
@@ -1 +1 @@
-Subproject commit b8b1e2741c58ddc7fd3bcd2a994831f641db0e83
+Subproject commit d535d8d3d3c52452f1e97980432fe369ce74b2b4