diff --git a/.github/workflows/build_cmake.yml b/.github/workflows/build_cmake.yml
index 416223c75af..d866f1f6d70 100644
--- a/.github/workflows/build_cmake.yml
+++ b/.github/workflows/build_cmake.yml
@@ -7,7 +7,7 @@ on:
       - 'doc/**'
 
 env:
-  QT_VERSION: 6.5.2
+  QT_VERSION: 6.6.0
   MACOS_DEPLOYMENT_TARGET: 10.15
   CLANG_VERSION: 17.0.1
   ELFUTILS_VERSION: 0.175
@@ -201,7 +201,7 @@ jobs:
           set(url_os "linux_x64")
           set(qt_package_arch_suffix "gcc_64")
           set(qt_dir_prefix "${qt_version}/gcc_64")
-          set(qt_package_suffix "-Linux-RHEL_8_4-GCC-Linux-RHEL_8_4-X86_64")
+          set(qt_package_suffix "-Linux-RHEL_8_6-GCC-Linux-RHEL_8_6-X86_64")
         elseif ("${{ runner.os }}" STREQUAL "macOS")
           set(url_os "mac_x64")
           set(qt_package_arch_suffix "clang_64")
diff --git a/coin/instructions/common_environment.yaml b/coin/instructions/common_environment.yaml
index ea72589c1df..0f651d187a8 100644
--- a/coin/instructions/common_environment.yaml
+++ b/coin/instructions/common_environment.yaml
@@ -10,7 +10,7 @@ instructions:
         variableValue: https://ci-files02-hki.ci.qt.io/packages/jenkins/qtcreator_libclang/libclang-release_17.0.1-based
       - type: EnvironmentVariable
         variableName: QTC_QT_BASE_URL
-        variableValue: "https://ci-files02-hki.ci.qt.io/packages/jenkins/archive/qt/6.5/6.5.2-released/Qt"
+        variableValue: "https://ci-files02-hki.ci.qt.io/packages/jenkins/archive/qt/6.6/6.6.0-released/Qt"
       - type: EnvironmentVariable
         variableName: QTC_QT_MODULES
         variableValue: "qt5compat qtbase qtdeclarative qtimageformats qtquick3d qtquickcontrols2 qtquicktimeline qtserialport qtshadertools qtsvg qttools qttranslations qtwebengine"
@@ -39,7 +39,7 @@ instructions:
         instructions:
           - type: EnvironmentVariable
             variableName: QTC_QT_POSTFIX
-            variableValue: "-Linux-RHEL_8_4-GCC-Linux-RHEL_8_4-X86_64.7z"
+            variableValue: "-Linux-RHEL_8_6-GCC-Linux-RHEL_8_6-X86_64.7z"
           - type: EnvironmentVariable
             variableName: QTC_SDKTOOL_QT_EXT
             variableValue: ".tar.xz"