diff --git a/.github/actionlint.yaml b/.github/actionlint.yaml
index eacfff24889021..51bcdecde12005 100644
--- a/.github/actionlint.yaml
+++ b/.github/actionlint.yaml
@@ -1,5 +1,12 @@
 config-variables: null
 
+# At 2026-07-01, ubuntu-26.04 is not self hosted, but a "public preview" not
+# recognized by actionlint yet.
+self-hosted-runner:
+  labels:
+    - ubuntu-26.04
+    - ubuntu-26.04-arm
+
 paths:
   .github/workflows/**/*.yml:
      ignore:
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index d9a956a6bf5303..7bd831c6bea3b1 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -53,7 +53,7 @@ jobs:
     name: 'Check if Autoconf files are up to date'
     # Don't use ubuntu-latest but a specific version to make the job
     # reproducible: to get the same tools versions (autoconf, aclocal, ...)
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     container:
       image: ghcr.io/python/autoconf:2025.01.02.12581854023
     timeout-minutes: 60
@@ -96,7 +96,7 @@ jobs:
     name: 'Check if generated files are up to date'
     # Don't use ubuntu-latest but a specific version to make the job
     # reproducible: to get the same tools versions (autoconf, aclocal, ...)
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     timeout-minutes: 60
     needs: build-context
     if: needs.build-context.outputs.run-tests == 'true'
@@ -239,18 +239,18 @@ jobs:
         - false
         - true
         os:
-        - ubuntu-24.04
-        - ubuntu-24.04-arm
+        - ubuntu-26.04
+        - ubuntu-26.04-arm
         exclude:
         # Do not test BOLT with free-threading, to conserve resources
         - bolt: true
           free-threading: true
         # BOLT currently crashes during instrumentation on aarch64
-        - os: ubuntu-24.04-arm
+        - os: ubuntu-26.04-arm
           bolt: true
         include:
         # Enable CPU-intensive tests on ARM (default build only)
-        - os: ubuntu-24.04-arm
+        - os: ubuntu-26.04-arm
           bolt: false
           free-threading: false
           test-opts: '-u cpu'
@@ -270,7 +270,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-24.04]
+        os: [ubuntu-26.04]
         ssllib:
           # See Tools/ssl/make_ssl_data.py for notes on adding a new version
           ## OpenSSL
@@ -346,15 +346,17 @@ jobs:
           - arch: aarch64
             runs-on: macos-26
           - arch: x86_64
-            runs-on: ubuntu-24.04
+            runs-on: ubuntu-26.04
 
     runs-on: ${{ matrix.runs-on }}
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           persist-credentials: false
+      - name: Dump environment
+        run: env
       - name: Build and test
-        run: python3 Platforms/Android ci --fast-ci ${{ matrix.arch }}-linux-android
+        run: JAVA_HOME="${JAVA_HOME_17_X64:-$JAVA_HOME_17_arm64}" python3 Platforms/Android ci --fast-ci ${{ matrix.arch }}-linux-android
 
   build-ios:
     name: iOS
@@ -393,7 +395,7 @@ jobs:
 
   test-hypothesis:
     name: "Hypothesis tests on Ubuntu"
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     timeout-minutes: 60
     needs: build-context
     if: needs.build-context.outputs.run-ubuntu == 'true'
@@ -504,7 +506,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-24.04]
+        os: [ubuntu-26.04]
     env:
       OPENSSL_VER: 3.5.7
       PYTHONSTRICTEXTENSIONBUILD: 1
@@ -519,10 +521,6 @@ jobs:
       run: echo "::add-matcher::.github/problem-matchers/gcc.json"
     - name: Install dependencies
       run: sudo ./.github/workflows/posix-deps-apt.sh
-    - name: Set up GCC-10 for ASAN
-      uses: egor-tensin/setup-gcc@a2861a8b8538f49cf2850980acccf6b05a1b2ae4 # v2.0
-      with:
-        version: 10
     - name: Configure OpenSSL env vars
       run: |
         echo "MULTISSL_DIR=${GITHUB_WORKSPACE}/multissl" >> "$GITHUB_ENV"
diff --git a/.github/workflows/jit.yml b/.github/workflows/jit.yml
index 025ff7ecbeeaff..994e35858ff992 100644
--- a/.github/workflows/jit.yml
+++ b/.github/workflows/jit.yml
@@ -29,7 +29,7 @@ env:
 jobs:
   interpreter:
     name: Interpreter (Debug)
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     timeout-minutes: 60
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
@@ -145,9 +145,9 @@ jobs:
           - false
         include:
           - target: x86_64-unknown-linux-gnu/gcc
-            runner: ubuntu-24.04
+            runner: ubuntu-26.04
           - target: aarch64-unknown-linux-gnu/gcc
-            runner: ubuntu-24.04-arm
+            runner: ubuntu-26.04-arm
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
@@ -171,7 +171,7 @@ jobs:
   linux-extras:
     name: ${{ matrix.name }}
 
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     timeout-minutes: 60
     strategy:
       fail-fast: false
diff --git a/.github/workflows/posix-deps-apt.sh b/.github/workflows/posix-deps-apt.sh
index f241fccdeb2a32..aeec15b66a3b7e 100755
--- a/.github/workflows/posix-deps-apt.sh
+++ b/.github/workflows/posix-deps-apt.sh
@@ -5,6 +5,7 @@ apt-get -yq --no-install-recommends install \
     build-essential \
     pkg-config \
     cmake \
+    curl \
     gdb \
     lcov \
     libb2-dev \
@@ -19,7 +20,6 @@ apt-get -yq --no-install-recommends install \
     libssl-dev \
     libzstd-dev \
     lzma \
-    lzma-dev \
     strace \
     tk-dev \
     uuid-dev \
diff --git a/.github/workflows/reusable-docs.yml b/.github/workflows/reusable-docs.yml
index 7b524569f85c9e..e00967e2413a66 100644
--- a/.github/workflows/reusable-docs.yml
+++ b/.github/workflows/reusable-docs.yml
@@ -95,7 +95,7 @@ jobs:
   # Run "doctest" on HEAD as new syntax doesn't exist in the latest stable release
   doctest:
     name: 'Doctest'
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     timeout-minutes: 60
     steps:
     - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
diff --git a/.github/workflows/reusable-emscripten.yml b/.github/workflows/reusable-emscripten.yml
index 38e6dcceb8f47c..c14a41b5682877 100644
--- a/.github/workflows/reusable-emscripten.yml
+++ b/.github/workflows/reusable-emscripten.yml
@@ -12,7 +12,7 @@ env:
 jobs:
   build-emscripten-reusable:
     name: 'build and test'
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     timeout-minutes: 40
     steps:
     - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
diff --git a/.github/workflows/reusable-san.yml b/.github/workflows/reusable-san.yml
index ef36447964cf41..6b2f8fc5d65460 100644
--- a/.github/workflows/reusable-san.yml
+++ b/.github/workflows/reusable-san.yml
@@ -26,7 +26,7 @@ jobs:
         && ' (free-threading)'
         || ''
       }}
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     timeout-minutes: 60
     steps:
     - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
@@ -40,11 +40,11 @@ jobs:
         # Install clang
         wget https://apt.llvm.org/llvm.sh
         chmod +x llvm.sh
-        sudo ./llvm.sh 20
-        sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-20 100
-        sudo update-alternatives --set clang /usr/bin/clang-20
-        sudo update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-20 100
-        sudo update-alternatives --set clang++ /usr/bin/clang++-20
+        sudo ./llvm.sh 22
+        sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-22 100
+        sudo update-alternatives --set clang /usr/bin/clang-22
+        sudo update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-22 100
+        sudo update-alternatives --set clang++ /usr/bin/clang++-22
 
         if [ "${SANITIZER}" = "TSan" ]; then
           # Reduce ASLR to avoid TSan crashing
diff --git a/.github/workflows/reusable-ubuntu.yml b/.github/workflows/reusable-ubuntu.yml
index f4321cefa1b598..4396f0887ffdc9 100644
--- a/.github/workflows/reusable-ubuntu.yml
+++ b/.github/workflows/reusable-ubuntu.yml
@@ -49,9 +49,9 @@ jobs:
     - name: Install Clang and BOLT
       if: ${{ fromJSON(inputs.bolt-optimizations) }}
       run: |
-        sudo bash -c "$(wget -O - https://apt.llvm.org/llvm.sh)" ./llvm.sh 19
-        sudo apt-get install --no-install-recommends bolt-19
-        echo PATH="$(llvm-config-19 --bindir):$PATH" >> $GITHUB_ENV
+        sudo bash -c "$(wget -O - https://apt.llvm.org/llvm.sh)" ./llvm.sh 22
+        sudo apt-get install --no-install-recommends bolt-22
+        echo PATH="$(llvm-config-22 --bindir):$PATH" >> $GITHUB_ENV
     - name: Configure OpenSSL env vars
       run: |
         echo "MULTISSL_DIR=${GITHUB_WORKSPACE}/multissl" >> "$GITHUB_ENV"
diff --git a/.github/workflows/reusable-wasi.yml b/.github/workflows/reusable-wasi.yml
index 4b4888c3844409..2643b438c2a7a8 100644
--- a/.github/workflows/reusable-wasi.yml
+++ b/.github/workflows/reusable-wasi.yml
@@ -12,7 +12,7 @@ env:
 jobs:
   build-wasi-reusable:
     name: 'build and test'
-    runs-on: ubuntu-24.04-arm
+    runs-on: ubuntu-26.04-arm
     timeout-minutes: 60
     env:
       WASMTIME_VERSION: 38.0.3
diff --git a/.github/workflows/tail-call.yml b/.github/workflows/tail-call.yml
index 656a14906b3cb7..5ca1db9bd517c5 100644
--- a/.github/workflows/tail-call.yml
+++ b/.github/workflows/tail-call.yml
@@ -20,7 +20,7 @@ concurrency:
 
 env:
   FORCE_COLOR: 1
-  LLVM_VERSION: 21
+  LLVM_VERSION: 22
 
 jobs:
   macos:
@@ -66,13 +66,13 @@ jobs:
       matrix:
         include:
           - target: x86_64-unknown-linux-gnu/gcc
-            runner: ubuntu-24.04
+            runner: ubuntu-26.04
             configure_flags: --with-pydebug
           - target: x86_64-unknown-linux-gnu/gcc-free-threading
-            runner: ubuntu-24.04
+            runner: ubuntu-26.04
             configure_flags: --disable-gil
           - target: aarch64-unknown-linux-gnu/gcc
-            runner: ubuntu-24.04-arm
+            runner: ubuntu-26.04-arm
             configure_flags: --with-pydebug
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
diff --git a/Python/bytecodes.c b/Python/bytecodes.c
index 7fb48516e2eae7..88e80877f22b4f 100644
--- a/Python/bytecodes.c
+++ b/Python/bytecodes.c
@@ -6,6 +6,7 @@
 // The actual instruction definitions start at // BEGIN BYTECODES //.
 // See Tools/cases_generator/README.md for more information.
 
+
 #include "Python.h"
 #include "pycore_abstract.h"      // _PyIndex_Check()
 #include "pycore_audit.h"         // _PySys_Audit()
diff --git a/Python/getcompiler.c b/Python/getcompiler.c
index cc56ad8c895551..1381a278f80149 100644
--- a/Python/getcompiler.c
+++ b/Python/getcompiler.c
@@ -24,6 +24,7 @@
 
 #endif /* !COMPILER */
 
+
 const char *
 Py_GetCompiler(void)
 {