diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 354514615..dea323409 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -36,7 +36,7 @@ jobs:
             cc: "clang-16",
             cxx: "clang++-16",
             clang_version: 16,
-            installed_clang_version: 14
+            installed_clang_version: 16
           }
 
         - {
@@ -46,7 +46,7 @@ jobs:
             cc: "clang-16",
             cxx: "clang++-16",
             clang_version: 16,
-            installed_clang_version: 14
+            installed_clang_version: 16
           }
 
         - {
@@ -56,7 +56,7 @@ jobs:
             cc: "clang-17",
             cxx: "clang++-17",
             clang_version: 17,
-            installed_clang_version: 14
+            installed_clang_version: 16
           }
 
         - {
@@ -66,7 +66,7 @@ jobs:
             cc: "clang-18",
             cxx: "clang++-18",
             clang_version: 18,
-            installed_clang_version: 14
+            installed_clang_version: 16
           }
         - {
             name: "Ubuntu Clang-18 Sanitizer",
@@ -75,7 +75,7 @@ jobs:
             cc: "clang-18",
             cxx: "clang++-18",
             clang_version: 18,
-            installed_clang_version: 14
+            installed_clang_version: 16
           }
 
 
@@ -86,7 +86,7 @@ jobs:
             cc: "clang-19",
             cxx: "clang++-19",
             clang_version: 19,
-            installed_clang_version: 14
+            installed_clang_version: 16
           }
 
         - {
@@ -96,7 +96,7 @@ jobs:
             cc: "gcc-13",
             cxx: "g++-13",
             clang_version: 16,
-            installed_clang_version: 14
+            installed_clang_version: 16
           }
 
           # Clang doesn't have good enough C++20 support to compile this library
@@ -116,7 +116,7 @@ jobs:
           submodules: 'true'
 
       - name: Install LLVM+Clang
-        if: startsWith(matrix.config.os, 'ubuntu-')
+        if: startsWith(matrix.config.os, 'ubuntu-') && matrix.config.clang_version != matrix.config.installed_clang_version
         run: |
           sudo apt-get remove clang-${{matrix.config.installed_clang_version}} \
             lldb-${{matrix.config.installed_clang_version}} \
diff --git a/.github/workflows/clang-doc.yml b/.github/workflows/clang-doc.yml
index 54c1e614e..586ec3599 100644
--- a/.github/workflows/clang-doc.yml
+++ b/.github/workflows/clang-doc.yml
@@ -10,6 +10,9 @@ jobs:
     # Is disabled.
     if: false && (github.repository == 'chromium/subspace')
     runs-on: ubuntu-latest
+    env:
+      clang_version: 16
+      installed_clang_version: 16
 
     steps:
       - uses: actions/checkout@v4
@@ -21,16 +24,17 @@ jobs:
             ssh-private-key: ${{ secrets.DOCS_SSH_PRIVATE_KEY }}
 
       - name: Install LLVM+Clang
+        if: env.clang_version != env.installed_clang_version
         run: |
           wget https://apt.llvm.org/llvm.sh
           chmod +x llvm.sh
-          sudo ./llvm.sh 16 all
+          sudo ./llvm.sh ${clang_version} all
 
       - name: Configure
         run: |
           # Path to LLVM+Clang nightly that we have installed.
-          export LLVM_DIR="/usr/lib/llvm-16/lib/cmake/llvm"
-          export Clang_DIR="/usr/lib/llvm-16/lib/cmake/clang"
+          export LLVM_DIR="/usr/lib/llvm-${clang_version}/lib/cmake/llvm"
+          export Clang_DIR="/usr/lib/llvm-${clang_version}/lib/cmake/clang"
 
           sudo apt install build-essential cmake ninja-build
           cmake -G Ninja -B out -DCMAKE_EXPORT_COMPILE_COMMANDS=1 -DSUBSPACE_BUILD_SUBDOC=OFF
@@ -44,14 +48,14 @@ jobs:
           # Work around https://github.com/llvm/llvm-project/issues/59815 as the
           # default stylesheet and index.js are not included in the debian
           # package, which leads to an error when running the tool.
-          sudo mkdir -p /usr/lib/llvm-16/share/clang/
-          sudo cp tools/clang-doc/clang-doc-default-stylesheet.css /usr/lib/llvm-16/share/clang/
-          sudo cp tools/clang-doc/index.js /usr/lib/llvm-16/share/clang/
+          sudo mkdir -p /usr/lib/llvm-${clang_version}/share/clang/
+          sudo cp tools/clang-doc/clang-doc-default-stylesheet.css /usr/lib/llvm-${clang_version}/share/clang/
+          sudo cp tools/clang-doc/index.js /usr/lib/llvm-${clang_version}/share/clang/
 
           # For crash dumps.
-          export LLVM_SYMBOLIZER_PATH="/usr/lib/llvm-16/bin/llvm-symbolizer"
+          export LLVM_SYMBOLIZER_PATH="/usr/lib/llvm-${clang_version}/bin/llvm-symbolizer"
 
-          clang-doc-16 \
+          clang-doc-${clang_version} \
             --executor=all-TUs \
             --format=html \
             --public \
diff --git a/.github/workflows/hdoc.yml b/.github/workflows/hdoc.yml
index 57b6d19ec..38647375a 100644
--- a/.github/workflows/hdoc.yml
+++ b/.github/workflows/hdoc.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     env:
       clang_version: 16
-      installed_clang_version: 14
+      installed_clang_version: 16
 
     steps:
       - uses: actions/checkout@v4
@@ -19,6 +19,7 @@ jobs:
           submodules: 'true'
 
       - name: Install LLVM+Clang
+        if: env.clang_version != env.installed_clang_version
         run: |
           sudo apt-get remove clang-${installed_clang_version} \
             lldb-${installed_clang_version} \
diff --git a/.github/workflows/subdoc.yml b/.github/workflows/subdoc.yml
index 25b91c843..c09b27033 100644
--- a/.github/workflows/subdoc.yml
+++ b/.github/workflows/subdoc.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     env:
       clang_version: 18
-      installed_clang_version: 14
+      installed_clang_version: 16
       source_url: "https://github.com/chromium/subspace/blob/main"
 
     steps:
@@ -29,6 +29,7 @@ jobs:
           ssh-private-key: ${{ secrets.DOCS_SSH_PRIVATE_KEY }}
 
       - name: Install LLVM+Clang
+        if: env.clang_version != env.installed_clang_version
         run: |
           sudo apt-get remove clang-${installed_clang_version} \
             lldb-${installed_clang_version} \
diff --git a/.github/workflows/try.yml b/.github/workflows/try.yml
index ea49cb46c..1568f823b 100644
--- a/.github/workflows/try.yml
+++ b/.github/workflows/try.yml
@@ -38,7 +38,7 @@ jobs:
             cc: "clang-16",
             cxx: "clang++-16",
             clang_version: 16,
-            installed_clang_version: 14
+            installed_clang_version: 16
           }
 
         - {
@@ -48,7 +48,7 @@ jobs:
             cc: "clang-16",
             cxx: "clang++-16",
             clang_version: 16,
-            installed_clang_version: 14
+            installed_clang_version: 16
           }
 
         - {
@@ -58,7 +58,7 @@ jobs:
             cc: "clang-17",
             cxx: "clang++-17",
             clang_version: 17,
-            installed_clang_version: 14
+            installed_clang_version: 16
           }
 
         - {
@@ -68,7 +68,7 @@ jobs:
             cc: "clang-18",
             cxx: "clang++-18",
             clang_version: 18,
-            installed_clang_version: 14
+            installed_clang_version: 16
           }
         - {
             name: "Ubuntu Clang-18 Sanitizer",
@@ -77,7 +77,7 @@ jobs:
             cc: "clang-18",
             cxx: "clang++-18",
             clang_version: 18,
-            installed_clang_version: 14
+            installed_clang_version: 16
           }
 
         - {
@@ -87,7 +87,7 @@ jobs:
             cc: "clang-19",
             cxx: "clang++-19",
             clang_version: 19,
-            installed_clang_version: 14
+            installed_clang_version: 16
           }
 
         - {
@@ -97,7 +97,7 @@ jobs:
             cc: "gcc-13",
             cxx: "g++-13",
             clang_version: 16,
-            installed_clang_version: 14
+            installed_clang_version: 16
           }
 
         # Clang doesn't have good enough C++20 support to compile this library
@@ -117,7 +117,7 @@ jobs:
           submodules: 'true'
 
       - name: Install LLVM+Clang
-        if: startsWith(matrix.config.os, 'ubuntu-')
+        if: startsWith(matrix.config.os, 'ubuntu-') && matrix.config.clang_version != matrix.config.installed_clang_version
         run: |
           sudo apt-get remove clang-${{matrix.config.installed_clang_version}} \
             lldb-${{matrix.config.installed_clang_version}} \
@@ -277,7 +277,7 @@ jobs:
     runs-on: ubuntu-latest
     env:
       clang_version: 18
-      installed_clang_version: 14
+      installed_clang_version: 16
       source_url: "https://github.com/chromium/subspace/blob/main"
 
     steps:
@@ -286,6 +286,7 @@ jobs:
           submodules: 'true'
 
       - name: Install LLVM+Clang
+        if: env.clang_version != env.installed_clang_version
         run: |
           sudo apt-get remove clang-${installed_clang_version} \
             lldb-${installed_clang_version} \
@@ -437,7 +438,7 @@ jobs:
     runs-on: ubuntu-latest
     env:
       clang_version: 17
-      installed_clang_version: 14
+      installed_clang_version: 16
 
     steps:
       - uses: actions/checkout@v4
@@ -445,6 +446,7 @@ jobs:
           submodules: 'true'
 
       - name: Install LLVM+Clang
+        if: env.clang_version != env.installed_clang_version
         run: |
           sudo apt-get remove clang-${installed_clang_version} \
             lldb-${installed_clang_version} \