diff --git a/.github/workflows/format.yml b/.github/workflows/format.yml
index 2c00db4b6..b9887ccac 100644
--- a/.github/workflows/format.yml
+++ b/.github/workflows/format.yml
@@ -19,9 +19,9 @@ jobs:
       - name: Install
         run: |
           wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
-          sudo add-apt-repository 'deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-18 main'
+          sudo add-apt-repository 'deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-17 main'
           sudo apt update
-          sudo apt install clang-format-18
+          sudo apt install clang-format-17
       - name: Build
         env:
           COMMIT_RANGE: ${{ github.event.pull_request.base.sha }}..${{ github.event.pull_request.head.sha }}
diff --git a/.github/workflows/linux-qt.yml b/.github/workflows/linux-qt.yml
index 342f0e81b..2d3d406a8 100644
--- a/.github/workflows/linux-qt.yml
+++ b/.github/workflows/linux-qt.yml
@@ -12,7 +12,7 @@ on:
 env:
   # Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
   BUILD_TYPE: Release
-  CLANG_VER: 18
+  CLANG_VER: 17
 
 jobs:
   build:
@@ -41,7 +41,7 @@ jobs:
         version:      6.7.0
         host:         linux
         target:       desktop
-        #arch:         clang++-18
+        #arch:         clang++-17
         dir:          ${{ runner.temp }}
         #modules:      qtcharts qt3d
         setup-python: false  
diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index 3f3ed4208..d8dc88461 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -13,7 +13,7 @@ on:
 env:
   # Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
   BUILD_TYPE: Release
-  CLANG_VER: 18
+  CLANG_VER: 17
 
 jobs:
   build: