diff --git a/2021/Flynn b/2021/Flynn
index b43d0d0..26161aa 160000
--- a/2021/Flynn
+++ b/2021/Flynn
@@ -1 +1 @@
-Subproject commit b43d0d01ed3c5d8840ae8204668b33139770796f
+Subproject commit 26161aad5279d497246e888a81ae028313f1f6a6
diff --git a/2021/Lox b/2021/Lox
index 1f1945f..c560157 160000
--- a/2021/Lox
+++ b/2021/Lox
@@ -1 +1 @@
-Subproject commit 1f1945f5f8f0cea9355c46d77a197e4cc45f12a6
+Subproject commit c560157ecda18b99ccf424a90979dd23f35b98cd
diff --git a/2021/chvp b/2021/chvp
index f591217..06c0c36 160000
--- a/2021/chvp
+++ b/2021/chvp
@@ -1 +1 @@
-Subproject commit f591217600ef4415f76744e40d5aea3ee4a041f8
+Subproject commit 06c0c366b7807ab5b9ce0282ebd2df453eb06b7d
diff --git a/2021/jaspervdj b/2021/jaspervdj
index 8a7ce36..104b5f9 160000
--- a/2021/jaspervdj
+++ b/2021/jaspervdj
@@ -1 +1 @@
-Subproject commit 8a7ce36d0a8321cb6a5e9a82cb467a04468538cf
+Subproject commit 104b5f947b7f6b5b3a26d3ccb38cfe6ceec7ddda
diff --git a/2021/ninewise b/2021/ninewise
index 9efab87..f4227e4 160000
--- a/2021/ninewise
+++ b/2021/ninewise
@@ -1 +1 @@
-Subproject commit 9efab871b1da41d5bb5f8ae04e00b406a4eac452
+Subproject commit f4227e42ecc28ee211925f7dd1707dbed3ac8927
diff --git a/2021/robbe b/2021/robbe
index bf927a2..91c9b3b 160000
--- a/2021/robbe
+++ b/2021/robbe
@@ -1 +1 @@
-Subproject commit bf927a21d146b316ad75e358b17df2cb5a8cfddf
+Subproject commit 91c9b3be554b8785f0ddfdc136bd268a8ca07f26
diff --git a/2021/silvius b/2021/silvius
index a53d50c..fb3048a 160000
--- a/2021/silvius
+++ b/2021/silvius
@@ -1 +1 @@
-Subproject commit a53d50cb141f0e310a58433e7a500e431b676143
+Subproject commit fb3048affa6ed5695db869ddada2c19e7418bad7