diff --git a/.gitmodules b/.gitmodules
index 8fba97b..d1f4ea3 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -73,9 +73,6 @@
 [submodule "2021/robbe"]
 	path = 2021/robbe
 	url = https://github.com/Robbe7730/adventofcode2021.git
-[submodule "2021/silvius"]
-	path = 2021/silvius
-	url = https://github.com/ajuvercr/aoc-2021.git
 [submodule "robbe"]
 [submodule "2021/Flynn"]
 	path = 2021/Flynn
@@ -86,18 +83,12 @@
 [submodule "2021/iasoon"]
 	path = 2021/iasoon
 	url = https://github.com/iasoon/aoc2021
-[submodule "2021/Bond-009"]
-	path = 2021/Bond-009
-	url = https://github.com/Bond-009/advent-of-code-2021
 [submodule "2021/Timpy"]
 	path = 2021/Timpy
 	url = https://github.com/timodw/aoc_2021
 [submodule "SWAMP"]
 	path = SWAMP
 	url = https://github.com/AWerbrouck/AoC
-[submodule "2021/SWAMP"]
-	path = 2021/SWAMP
-	url = https://github.com/AWerbrouck/AoC
 [submodule "2021/Francis."]
 	path = 2021/Francis.
 	url = https://github.com/FKD13/AoC2021.git
@@ -172,10 +163,10 @@
 	url = https://github.com/timodw/aoc_2023
 [submodule "2023/robbe"]
 	path = 2023/robbe
-	url = git@github.com:Robbe7730/adventofcode2023
+	url = https://github.com/Robbe7730/adventofcode2023
 [submodule "2023/francis-punt"]
 	path = 2023/francis-punt
-	url = git@github.com:FKD13/AoC2023.git
+	url = https://github.com/FKD13/AoC2023
 [submodule "2023/vincent"]
 	path = 2023/vincent
 	url = https://github.com/Topvennie/AoC2023
diff --git a/2021/Bond-009 b/2021/Bond-009
deleted file mode 160000
index cebb7d7..0000000
--- a/2021/Bond-009
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit cebb7d74b110521511fd7f1144c310c9fddad8fc
diff --git a/2021/Flynn b/2021/Flynn
index 2e504cd..26161aa 160000
--- a/2021/Flynn
+++ b/2021/Flynn
@@ -1 +1 @@
-Subproject commit 2e504cdc7d659c53b130b4922e06cbe0f5ad2569
+Subproject commit 26161aad5279d497246e888a81ae028313f1f6a6
diff --git a/2021/SWAMP b/2021/SWAMP
deleted file mode 160000
index fc3b152..0000000
--- a/2021/SWAMP
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit fc3b15284f0ccb96d033cec31de378ca033eca52
diff --git a/2021/Timpy b/2021/Timpy
index d369b74..3137ce0 160000
--- a/2021/Timpy
+++ b/2021/Timpy
@@ -1 +1 @@
-Subproject commit d369b74738ac84d6742cd1b49854fd57d1ba01b2
+Subproject commit 3137ce01dc531ef42ad45695400e21ba776ee8d0
diff --git a/2021/chvp b/2021/chvp
index 02f81ac..aec3906 160000
--- a/2021/chvp
+++ b/2021/chvp
@@ -1 +1 @@
-Subproject commit 02f81ac987ba0d00af576a477e78652505acd832
+Subproject commit aec39063e14d5181de45500ecee13cb65781aa65
diff --git a/2021/iasoon b/2021/iasoon
index 83bb06a..54b2d49 160000
--- a/2021/iasoon
+++ b/2021/iasoon
@@ -1 +1 @@
-Subproject commit 83bb06a139e199ce34b3f9c4180ecfbd05212143
+Subproject commit 54b2d49c08279f132fd38ddfebf2cf3650bc0caf
diff --git a/2021/jaspervdj b/2021/jaspervdj
index 81051dd..2795c41 160000
--- a/2021/jaspervdj
+++ b/2021/jaspervdj
@@ -1 +1 @@
-Subproject commit 81051dd03b424c21f8d8bd1a737f7a7be5998301
+Subproject commit 2795c41f55b6cb9dfa05d49d15c53fe2aeb9afcd
diff --git a/2021/niknetniko b/2021/niknetniko
index b9c660c..3406b69 160000
--- a/2021/niknetniko
+++ b/2021/niknetniko
@@ -1 +1 @@
-Subproject commit b9c660cb7a7be1404df80a1bbfb62c51f9011081
+Subproject commit 3406b69596aa9ab6b4937c2516b213f4b8512f99
diff --git a/2021/ninewise b/2021/ninewise
index 9a85919..9d5e6d8 160000
--- a/2021/ninewise
+++ b/2021/ninewise
@@ -1 +1 @@
-Subproject commit 9a85919a6f082b8fc24f5aa147792146ecd68585
+Subproject commit 9d5e6d8390bc6116d3be6e54ba6a5b885fc18d63
diff --git a/2021/rien b/2021/rien
index 28ad9f0..9f2909e 160000
--- a/2021/rien
+++ b/2021/rien
@@ -1 +1 @@
-Subproject commit 28ad9f03cf773f8a729e2a307e34157123b36483
+Subproject commit 9f2909e30d74b18e6721ded3a0effa250142b245
diff --git a/2021/robbe b/2021/robbe
index 189a0a7..ecf1751 160000
--- a/2021/robbe
+++ b/2021/robbe
@@ -1 +1 @@
-Subproject commit 189a0a7b0af07b87a18198c357f38a3c05c2ec1a
+Subproject commit ecf1751ac16c4547ecfaf43a7458dab027ad607a
diff --git a/2021/silvius b/2021/silvius
deleted file mode 160000
index 6dfb9d8..0000000
--- a/2021/silvius
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 6dfb9d8a500c69be81927b3098771782d54d45a8
diff --git a/2023/chvp b/2023/chvp
index b284a74..e6b7883 160000
--- a/2023/chvp
+++ b/2023/chvp
@@ -1 +1 @@
-Subproject commit b284a74c4ced62496098d097e65b252930e48344
+Subproject commit e6b788389b066b81f5da5444988829d2a19d9afd
diff --git a/2023/hannes b/2023/hannes
index a2c3238..a1aec1c 160000
--- a/2023/hannes
+++ b/2023/hannes
@@ -1 +1 @@
-Subproject commit a2c32382c9ed02153c95342790b79b8907e3e5f4
+Subproject commit a1aec1c68103552786e1fa342a3edaa17a3ddd66
diff --git a/2023/mraedis b/2023/mraedis
index acd2a9d..f51cd6e 160000
--- a/2023/mraedis
+++ b/2023/mraedis
@@ -1 +1 @@
-Subproject commit acd2a9d28c7b875b122a2ee0c5743b8d4281b783
+Subproject commit f51cd6ec15a835d47f92bd417ba9932e27a73283
diff --git a/2023/timpy b/2023/timpy
index 957b10b..b8e1cdf 160000
--- a/2023/timpy
+++ b/2023/timpy
@@ -1 +1 @@
-Subproject commit 957b10b41ad677a4c021b77a433aac986fba2bcf
+Subproject commit b8e1cdfd0dabf8e0ea2f82ec1a1a2153a58278ce