diff --git a/kiwixbuild/versions.py b/kiwixbuild/versions.py
index 35a292c..2912733 100644
--- a/kiwixbuild/versions.py
+++ b/kiwixbuild/versions.py
@@ -1,7 +1,7 @@
 # This file reference all the versions of the depedencies we use in kiwix-build.
 
 main_project_versions = {
-    'libzim': '6.2.0',
+    'libzim': '6.2.1',
     'kiwix-lib': '9.4.0',
     'kiwix-tools': '3.1.2', # Also need to change this in appveyor/install_kiwix-tools.cmd
     'zim-tools': '2.0.0',
@@ -30,9 +30,9 @@ main_project_versions = {
 # - set KIWIX_DESKTOP_RELEASE to 0
 
 release_versions = {
-    'libzim': None, # Depends of base deps (was 0)
-    'kiwix-lib': 0, # Depends of libzim (was 0)
-    'kiwix-tools': 3, # Depends of kiwix-lib and libzim (was 2)
+    'libzim': 0, # Depends of base deps (was 0)
+    'kiwix-lib': None, # Depends of libzim (was 0)
+    'kiwix-tools': None, # Depends of kiwix-lib and libzim (was 3)
     'zim-tools': None, # Depends of libzim (was 2)
     'kiwix-desktop': 1 # Depends of kiwix-lib and libzim (was 0)
 }