diff --git a/.github/workflows/build_cmake.yml b/.github/workflows/build_cmake.yml
index e1be45d67c6..d695061f95d 100644
--- a/.github/workflows/build_cmake.yml
+++ b/.github/workflows/build_cmake.yml
@@ -7,7 +7,7 @@ on:
       - 'doc/**'
 
 env:
-  QT_VERSION: 6.4.1
+  QT_VERSION: 6.4.0
   CLANG_VERSION: 15.0.0
   ELFUTILS_VERSION: 0.175
   CMAKE_VERSION: 3.21.1
diff --git a/coin/instructions/common_environment.yaml b/coin/instructions/common_environment.yaml
index 7c6bcfe14c0..5843ca790b0 100644
--- a/coin/instructions/common_environment.yaml
+++ b/coin/instructions/common_environment.yaml
@@ -10,7 +10,7 @@ instructions:
         variableValue: http://master.qt.io/development_releases/prebuilt/libclang/libclang-release_15.0.0-based
       - type: EnvironmentVariable
         variableName: QTC_QT_BASE_URL
-        variableValue: "http://ci-files02-hki.intra.qt.io/packages/jenkins/archive/qt/6.4/6.4.1-released/Qt"
+        variableValue: "http://ci-files02-hki.intra.qt.io/packages/jenkins/archive/qt/6.4/6.4.0-released/Qt"
       - type: EnvironmentVariable
         variableName: QTC_QT_MODULES
         variableValue: "qt5compat qtbase qtdeclarative qtimageformats qtquick3d qtquickcontrols2 qtquicktimeline qtserialport qtshadertools qtsvg qttools qttranslations qtwebengine"