diff --git a/resources/scripts/github-actions/build-linux-mac.sh b/resources/scripts/github-actions/build-linux-mac.sh
index 1ffc333be..c2d683af8 100755
--- a/resources/scripts/github-actions/build-linux-mac.sh
+++ b/resources/scripts/github-actions/build-linux-mac.sh
@@ -51,7 +51,7 @@ else
   USE_QT6="ON"
 
   QTPATH="$(pwd)/Qt"
-  QTVERSION="6.5.1"
+  QTVERSION="6.4.3"
   QTBIN="$QTPATH/$QTVERSION/$QTOS/bin"
 
   # Install "aqtinstall" from its master branch to have latest code.
diff --git a/resources/scripts/github-actions/build-windows.ps1 b/resources/scripts/github-actions/build-windows.ps1
index 609f91d00..69ac99102 100755
--- a/resources/scripts/github-actions/build-windows.ps1
+++ b/resources/scripts/github-actions/build-windows.ps1
@@ -24,7 +24,7 @@ if ($use_qt5 -eq "ON") {
   $qt_version = "5.15.2"
 }
 else {
-  $qt_version = "6.5.1"
+  $qt_version = "6.4.3"
 }
 
 $maria_version = "10.6.12"