diff --git a/2021/Lox b/2021/Lox
index 8620e1a..e9fc457 160000
--- a/2021/Lox
+++ b/2021/Lox
@@ -1 +1 @@
-Subproject commit 8620e1aa4a34fa5e227f9e40b7fdf08982ffceaa
+Subproject commit e9fc457478a89cb1b29b2976024aa7505cddebd5
diff --git a/2021/chvp b/2021/chvp
index fddedc3..8067095 160000
--- a/2021/chvp
+++ b/2021/chvp
@@ -1 +1 @@
-Subproject commit fddedc3652e36c99b0218fdbd1db1dbe732ffbe3
+Subproject commit 8067095d9b4dbcf5d12c48cdc10b1c6c34574900
diff --git a/2021/ninewise b/2021/ninewise
index 87637a4..0582895 160000
--- a/2021/ninewise
+++ b/2021/ninewise
@@ -1 +1 @@
-Subproject commit 87637a4682b12e88daa957f4c858b6ddf7113ccc
+Subproject commit 0582895825fc75029906164ad3e6fd4f05bde569
diff --git a/2021/robbe b/2021/robbe
index 8577770..63ed3ce 160000
--- a/2021/robbe
+++ b/2021/robbe
@@ -1 +1 @@
-Subproject commit 85777706ad8eb04c9fe43676ea8acba5e2ba3ceb
+Subproject commit 63ed3cebf9ddf54b38126adb949b40855bc50e43