diff --git a/.clang-format b/.clang-format
index 61e0467fa65..9b7a6b629df 100644
--- a/.clang-format
+++ b/.clang-format
@@ -12,3 +12,5 @@ BraceWrapping:
     AfterFunction: true
 NamespaceIndentation: None
 QualifierAlignment: Right
+RequiresClausePosition: WithFollowing
+IndentRequiresClause: false
diff --git a/.github/workflows/cmake.yml b/.github/workflows/cmake.yml
index a40ad367091..56575891824 100644
--- a/.github/workflows/cmake.yml
+++ b/.github/workflows/cmake.yml
@@ -57,9 +57,9 @@ jobs:
         # Packages below aren't.
         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-14 main'
+          sudo add-apt-repository 'deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-15 main'
           sudo apt-get update
-          sudo apt-get install -y clang-format-14 ccache e2fsprogs gcc-12 g++-12 libstdc++-12-dev libmpfr-dev libmpc-dev ninja-build optipng qemu-utils qemu-system-i386 unzip
+          sudo apt-get install -y clang-format-15 ccache e2fsprogs gcc-12 g++-12 libstdc++-12-dev libmpfr-dev libmpc-dev ninja-build optipng qemu-utils qemu-system-i386 unzip
       - name: Install JS dependencies
         run: sudo npm install -g prettier@2.7.1
       - name: Install Python dependencies
@@ -68,7 +68,7 @@ jobs:
           python -m pip install --upgrade pip
           pip install flake8 requests
       - name: Check versions
-        run: set +e; g++ --version; g++-12 --version; clang-format --version; clang-format-14 --version; prettier --version; python --version; python3 --version; ninja --version; flake8 --version; ccache --version; qemu-system-i386 --version
+        run: set +e; g++ --version; g++-12 --version; clang-format --version; clang-format-15 --version; prettier --version; python --version; python3 --version; ninja --version; flake8 --version; ccache --version; qemu-system-i386 --version
 
       # === PREPARE FOR BUILDING ===
 
diff --git a/.github/workflows/pvs-studio-static-analysis.yml b/.github/workflows/pvs-studio-static-analysis.yml
index fc08333cb88..733eb0a0448 100644
--- a/.github/workflows/pvs-studio-static-analysis.yml
+++ b/.github/workflows/pvs-studio-static-analysis.yml
@@ -26,9 +26,9 @@ jobs:
         #
         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-14 main'
+          sudo add-apt-repository 'deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-15 main'
           sudo apt-get update
-          sudo apt-get install -y clang-format-14 gcc-12 g++-12 libstdc++-12-dev libmpfr-dev libmpc-dev ninja-build unzip pvs-studio
+          sudo apt-get install -y clang-format-15 gcc-12 g++-12 libstdc++-12-dev libmpfr-dev libmpc-dev ninja-build unzip pvs-studio
 
       - name: Check versions
         run: set +e; g++ --version; g++-12 --version; ninja --version;
diff --git a/.github/workflows/sonar-cloud-static-analysis.yml b/.github/workflows/sonar-cloud-static-analysis.yml
index ecaed3111be..415c38c20e0 100644
--- a/.github/workflows/sonar-cloud-static-analysis.yml
+++ b/.github/workflows/sonar-cloud-static-analysis.yml
@@ -59,9 +59,9 @@ jobs:
         # Packages below aren't.
         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-14 main'
+          sudo add-apt-repository 'deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-15 main'
           sudo apt-get update
-          sudo apt-get install -y clang-format-14 gcc-12 g++-12 libstdc++-12-dev libmpfr-dev libmpc-dev ninja-build unzip
+          sudo apt-get install -y clang-format-15 gcc-12 g++-12 libstdc++-12-dev libmpfr-dev libmpc-dev ninja-build unzip
 
       - name: Check versions
         run: set +e; g++ --version; g++-12 --version; ninja --version;
diff --git a/Documentation/SelfHostedRunners.md b/Documentation/SelfHostedRunners.md
index fb99c251c4e..d8ed616824e 100644
--- a/Documentation/SelfHostedRunners.md
+++ b/Documentation/SelfHostedRunners.md
@@ -20,9 +20,9 @@ These instructions assume the OS installed is Ubuntu 22.04 (Jammy), so they migh
 ```shell
 sudo add-apt-repository ppa:canonical-server/server-backports
 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-focal-14 main'
+sudo add-apt-repository 'deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-15 main'
 apt update
-apt install git build-essential make cmake clang-format-14 gcc-12 g++-12 libstdc++-12-dev libgmp-dev ccache libmpfr-dev libmpc-dev ninja-build e2fsprogs qemu-utils qemu-system-i386 wabt
+apt install git build-essential make cmake clang-format-15 gcc-12 g++-12 libstdc++-12-dev libgmp-dev ccache libmpfr-dev libmpc-dev ninja-build e2fsprogs qemu-utils qemu-system-i386 wabt
 ```
 ### Force usage of GCC 12
 ```shell
diff --git a/Meta/Azure/Setup.yml b/Meta/Azure/Setup.yml
index 97fc47f662c..c24b7eb5ca3 100644
--- a/Meta/Azure/Setup.yml
+++ b/Meta/Azure/Setup.yml
@@ -8,9 +8,9 @@ steps:
   - ${{ if eq(parameters.os, 'Serenity') }}:
     - script: |
         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-14 main'
+        sudo add-apt-repository 'deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-15 main'
         sudo apt-get update
-        sudo apt-get install clang-format-14 ccache e2fsprogs gcc-12 g++-12 libstdc++-12-dev libmpfr-dev libmpc-dev ninja-build qemu-utils qemu-system-i386 unzip lld
+        sudo apt-get install clang-format-15 ccache e2fsprogs gcc-12 g++-12 libstdc++-12-dev libmpfr-dev libmpc-dev ninja-build qemu-utils qemu-system-i386 unzip lld
       displayName: 'Install Dependencies'
 
   - ${{ if eq(parameters.os, 'Linux') }}:
diff --git a/Meta/lint-clang-format.sh b/Meta/lint-clang-format.sh
index 66414763025..d8746c19842 100755
--- a/Meta/lint-clang-format.sh
+++ b/Meta/lint-clang-format.sh
@@ -28,21 +28,21 @@ fi
 if (( ${#files[@]} )); then
     TOOLCHAIN_DIR=Toolchain/Local/clang/bin
     CLANG_FORMAT=false
-    if command -v clang-format-14 >/dev/null 2>&1 ; then
-        CLANG_FORMAT=clang-format-14
-    elif command -v brew >/dev/null 2>&1 && command -v "$(brew --prefix llvm@14)"/bin/clang-format >/dev/null 2>&1 ; then
-        CLANG_FORMAT="$(brew --prefix llvm@14)"/bin/clang-format
-    elif command -v $TOOLCHAIN_DIR/clang-format >/dev/null 2>&1 && $TOOLCHAIN_DIR/clang-format --version | grep -qF ' 14.' ; then
+    if command -v clang-format-15 >/dev/null 2>&1 ; then
+        CLANG_FORMAT=clang-format-15
+    elif command -v brew >/dev/null 2>&1 && command -v "$(brew --prefix llvm@15)"/bin/clang-format >/dev/null 2>&1 ; then
+        CLANG_FORMAT="$(brew --prefix llvm@15)"/bin/clang-format
+    elif command -v $TOOLCHAIN_DIR/clang-format >/dev/null 2>&1 && $TOOLCHAIN_DIR/clang-format --version | grep -qF ' 15.' ; then
         CLANG_FORMAT=$TOOLCHAIN_DIR/clang-format
     elif command -v clang-format >/dev/null 2>&1 ; then
         CLANG_FORMAT=clang-format
-        if ! "${CLANG_FORMAT}" --version | awk '{ if (substr($NF, 1, index($NF, ".") - 1) < 14) exit 1; }'; then
-            echo "You are using '$("${CLANG_FORMAT}" --version)', which appears to not be clang-format 14 or later."
+        if ! "${CLANG_FORMAT}" --version | awk '{ if (substr($NF, 1, index($NF, ".") - 1) < 15) exit 1; }'; then
+            echo "You are using '$("${CLANG_FORMAT}" --version)', which appears to not be clang-format 15 or later."
             echo "It is very likely that the resulting changes are not what you wanted."
         fi
     else
-        echo "clang-format-14 is not available, but C or C++ files need linting! Either skip this script, or install clang-format-14."
-        echo "(If you install a package 'clang-format', please make sure it's version 14 or later.)"
+        echo "clang-format-15 is not available, but C or C++ files need linting! Either skip this script, or install clang-format-15."
+        echo "(If you install a package 'clang-format', please make sure it's version 15 or later.)"
         exit 1
     fi