diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 8bf2cd9..8558990 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -5,7 +5,7 @@ on:
   pull_request:
 
 env:
-  BUILDCACHE_VERSION: v0.27.0
+  BUILDCACHE_VERSION: v0.28.3
   BUILDCACHE_ACCURACY: STRICT
   BUILDCACHE_MAX_CACHE_SIZE: 1073741824 # 1GiB
 
@@ -15,6 +15,7 @@ jobs:
     runs-on: ubuntu-20.04
 
     env:
+      LLVM_MAJOR: 15
       BUILDCACHE_DIR: ${{github.workspace}}/.buildcache
 
     steps:
@@ -26,7 +27,7 @@ jobs:
       - name: Install dependencies
         run: |
           sudo apt-get -y update
-          sudo apt-get -y install cmake ninja-build llvm-11-dev libclang-11-dev clang-11 zlib1g-dev
+          sudo apt-get -y install cmake ninja-build llvm-$LLVM_MAJOR-dev libclang-$LLVM_MAJOR-dev clang-$LLVM_MAJOR zlib1g-dev
 
           # setup buildcache
           curl -LSfs https://github.com/mbitsnbites/buildcache/releases/download/$BUILDCACHE_VERSION/buildcache-linux.tar.gz | tar xz -C "$RUNNER_WORKSPACE"
@@ -43,7 +44,7 @@ jobs:
           cmake -B build . -GNinja \
             -DCMAKE_BUILD_TYPE:STRING=RelWithDebInfo \
             -DATDNA_DYNAMIC_LLVM=OFF \
-            -DClang_DIR:PATH=/usr/lib/cmake/clang-11 \
+            -DClang_DIR:PATH=/usr/lib/cmake/clang-$LLVM_MAJOR \
             -DCMAKE_C_COMPILER_LAUNCHER:STRING=buildcache \
             -DCMAKE_CXX_COMPILER_LAUNCHER:STRING=buildcache
 
@@ -68,6 +69,9 @@ jobs:
     name: Build Linux (GCC aarch64)
     runs-on: ubuntu-20.04
 
+    env:
+      LLVM_MAJOR: 15
+
     steps:
       - uses: actions/checkout@v2
         with:
@@ -84,12 +88,12 @@ jobs:
             --volume "${PWD}:/workspace"
           install: |
             apt-get -y update
-            apt-get -y install build-essential cmake ninja-build llvm-11-dev libclang-11-dev clang-11 zlib1g-dev
+            apt-get -y install build-essential cmake ninja-build llvm-$LLVM_MAJOR-dev libclang-$LLVM_MAJOR-dev clang-$LLVM_MAJOR zlib1g-dev
           run: |
             cmake -B build . -GNinja \
               -DCMAKE_BUILD_TYPE:STRING=RelWithDebInfo \
               -DATDNA_DYNAMIC_LLVM:BOOL=OFF \
-              -DClang_DIR:PATH=/usr/lib/cmake/clang-11
+              -DClang_DIR:PATH=/usr/lib/cmake/clang-$LLVM_MAJOR
             cmake --build build --target package --verbose
             build/atdna-test
 
@@ -102,9 +106,11 @@ jobs:
 
   build-macos-universal:
     name: Build macOS (AppleClang universal)
-    runs-on: macos-10.15
+    runs-on: macos-latest
 
     env:
+      LLVM_MAJOR: 15
+      LLVM_VERSION: 15.0.7_2
       BUILDCACHE_DIR: ${{github.workspace}}/.buildcache
 
     steps:
@@ -119,8 +125,8 @@ jobs:
           brew install ninja
 
           # universal clang+llvm from macports
-          curl -LSfs https://axiodl.com/files/clang-11-11.1.0_1.mpkg -o /tmp/clang-11-11.1.0_1.mpkg
-          sudo installer -pkg /tmp/clang-11-11.1.0_1.mpkg -target /
+          curl -LSfs https://axiodl.com/files/clang-$LLVM_MAJOR-$LLVM_VERSION.mpkg -o /tmp/clang-$LLVM_MAJOR-$LLVM_VERSION.mpkg
+          sudo installer -pkg /tmp/clang-$LLVM_MAJOR-$LLVM_VERSION.mpkg -target /
 
           # setup buildcache
           curl -LSfs https://github.com/mbitsnbites/buildcache/releases/download/$BUILDCACHE_VERSION/buildcache-macos.zip -o /tmp/buildcache-macos.zip
@@ -131,14 +137,14 @@ jobs:
         uses: actions/cache@v2
         with:
           path: ${{env.BUILDCACHE_DIR}}
-          key: buildcache-macos-10.15
+          key: buildcache-macos-12
 
       - name: Configure CMake
         run: |
           cmake -B build . -GNinja \
             -DCMAKE_BUILD_TYPE:STRING=RelWithDebInfo \
             -DCMAKE_OSX_ARCHITECTURES:STRING="x86_64;arm64" \
-            -DLLVM_ROOT_DIR:PATH=/opt/local/libexec/llvm-11 \
+            -DLLVM_ROOT_DIR:PATH=/opt/local/libexec/llvm-$LLVM_MAJOR \
             -DCMAKE_C_COMPILER_LAUNCHER:STRING=buildcache \
             -DCMAKE_CXX_COMPILER_LAUNCHER:STRING=buildcache
 
@@ -161,10 +167,10 @@ jobs:
 
   build-win32-amd64:
     name: Build Windows (MSVC AMD64)
-    runs-on: windows-2019
+    runs-on: windows-latest
 
     env:
-      LLVM_VERSION: 11.1.0
+      LLVM_VERSION: 15.0.7
       BUILDCACHE_DIR: C:\buildcache
 
     steps: