diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 5c17d4110c1..7d08ab87c59 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -39,11 +39,6 @@ jobs:
     runs-on: windows-2019
     needs: ["decision"]
     steps:
-      # FIXME LLVM 15 breaks Windows builds https://github.com/servo/servo/issues/29269
-      - name: LLVM 14
-        run: |
-          $llvmVersion = Get-LatestChocoPackageVersion -TargetVersion 14 -PackageName llvm
-          Choco-Install -PackageName llvm -ArgumentList '--allow-downgrade', '--version', $llvmVersion
       - uses: actions/checkout@v3
         with:
           fetch-depth: 2
@@ -69,11 +64,6 @@ jobs:
     runs-on: windows-2019
     needs: ["decision"]
     steps:
-      # FIXME LLVM 15 breaks Windows builds https://github.com/servo/servo/issues/29269
-      - name: LLVM 14
-        run: |
-          $llvmVersion = Get-LatestChocoPackageVersion -TargetVersion 14 -PackageName llvm
-          Choco-Install -PackageName llvm -ArgumentList '--allow-downgrade', '--version', $llvmVersion
       - uses: actions/checkout@v3
         with:
           fetch-depth: 2
@@ -100,11 +90,6 @@ jobs:
     runs-on: windows-2019
     needs: ["decision"]
     steps:
-      # FIXME LLVM 15 breaks Windows builds https://github.com/servo/servo/issues/29269
-      - name: LLVM 14
-        run: |
-          $llvmVersion = Get-LatestChocoPackageVersion -TargetVersion 14 -PackageName llvm
-          Choco-Install -PackageName llvm -ArgumentList '--allow-downgrade', '--version', $llvmVersion
       - uses: actions/checkout@v3
         with:
           fetch-depth: 2
diff --git a/python/servo/packages.py b/python/servo/packages.py
index e076d444eaf..3b375eb2877 100644
--- a/python/servo/packages.py
+++ b/python/servo/packages.py
@@ -4,7 +4,7 @@
 
 WINDOWS_MSVC = {
     "cmake": "3.14.3",
-    "llvm": "14.0.6",
+    "llvm": "15.0.5",
     "moztools": "3.2",
     "ninja": "1.7.1",
     "nuget": "08-08-2019",
diff --git a/python/servo/testing_commands.py b/python/servo/testing_commands.py
index c98311ad9c5..2d14107af97 100644
--- a/python/servo/testing_commands.py
+++ b/python/servo/testing_commands.py
@@ -49,7 +49,7 @@ WEB_PLATFORM_TESTS_PATH = os.path.join("tests", "wpt", "web-platform-tests")
 SERVO_TESTS_PATH = os.path.join("tests", "wpt", "mozilla", "tests")
 
 CLANGFMT_CPP_DIRS = ["support/hololens/"]
-CLANGFMT_VERSION = "14"
+CLANGFMT_VERSION = "15"
 
 TEST_SUITES = OrderedDict([
     ("tidy", {"kwargs": {"all_files": False, "no_progress": False, "self_test": False,