diff --git a/.github/workflows/openkal-compat.yml b/.github/workflows/openkal-compat.yml
index 0dd7e900..dfdcf6e0 100644
--- a/.github/workflows/openkal-compat.yml
+++ b/.github/workflows/openkal-compat.yml
@@ -42,7 +42,7 @@ env:
   # run if this drifts from pins.toml. See the comment beside `mcpp` in
   # pins.toml for why this pin, not just validate.yml's, is gated by the
   # index floor.
-  MCPP_VERSION: "2026.11.2.1"
+  MCPP_VERSION: "2026.11.3.1"
   # CROSS-VALIDATION BEFORE A RELEASE, NOT AFTER IT.
   #
   # Empty in an ordinary run, so this measurement keeps using the RELEASED
diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index 410f6a3c..2731a34a 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -447,7 +447,7 @@ env:
   # 2026.11.2.1 (mcpp-community/mcpp#882): a dependency's patches and a
   # dependency embedded in its consumer -- the floor openkal-musl 0.26.0
   # states, since it embeds compat.mimalloc.
-  MCPP_VERSION: "2026.11.2.1"
+  MCPP_VERSION: "2026.11.3.1"
 
 jobs:
   lint:
diff --git a/.github/workflows/xpkgindex-update.yml b/.github/workflows/xpkgindex-update.yml
index dc62300a..38f74a2e 100644
--- a/.github/workflows/xpkgindex-update.yml
+++ b/.github/workflows/xpkgindex-update.yml
@@ -25,7 +25,7 @@ concurrency:
 
 env:
   PYTHONUTF8: '1'
-  MCPP_VERSION: '2026.11.2.1'
+  MCPP_VERSION: '2026.11.3.1'
   # CROSS-VALIDATION BEFORE A RELEASE: a candidate that needs an mcpp newer
   # than the pin (its package states the floor) is built with mcpp built from
   # this branch of mcpp-community/mcpp, as openkal-compat.yml measures with it.
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e6a94cb6..31c389c5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -499,6 +499,8 @@
 
 ### Changed
 
+- CI and compatibility measurements use mcpp 2026.11.3.1. The hosted platform member selects openkal-platform 0.23.3. The index client floor and compatibility runtime baseline are unchanged.
+
 - **compat.miniaudio 0.11.25 以 `gnu11` 编译(可构建到 wasm32-emscripten)。** Emscripten 上 miniaudio 的 Web Audio
   后端经 `EM_ASM` 内联 JavaScript,Emscripten 在严格的 `-std=c*` 模式下拒绝 `EM_ASM`(上游 miniaudio.h §2.6:
   不能使用 `-std=c*`),原来的 `c_standard = "c11"` 使 `mcpp build --target wasm32-emscripten` 编译失败;改为
diff --git a/tests/examples/openkal-platform/mcpp.toml b/tests/examples/openkal-platform/mcpp.toml
index c530490f..5be75bbe 100644
--- a/tests/examples/openkal-platform/mcpp.toml
+++ b/tests/examples/openkal-platform/mcpp.toml
@@ -10,7 +10,7 @@ name    = "openkal-platform-tests"
 version = "0.1.0"
 
 [target.'cfg(any(linux, macos))']
-platform = "openkal-platform@0.17.3"
+platform = "openkal-platform@0.23.3"
 
 [indices]
 mcpplibs = { path = "../../.." }
diff --git a/tests/openkal/pins.toml b/tests/openkal/pins.toml
index af6714bf..9e69269a 100644
--- a/tests/openkal/pins.toml
+++ b/tests/openkal/pins.toml
@@ -18,6 +18,9 @@ toolchain = "llvm@22.1.8"
 # index requires mcpp >= 2026.9.18.1 but this is mcpp 2026.9.17.3 [E0006]"
 # before a single line of the member's own source is read.
 #
+# 2026-11-03: measurement engine 2026.11.3.1 matches all CI workflows; the
+# hosted platform member uses the corrected 0.23.3 group. The compatibility
+# runtime/toolchain baseline and index client floor remain unchanged.
 # 2026-11-02: measurement engine 2026.11.2.1, the workflow's (openkal-musl 0.26.0
 # embeds compat.mimalloc and states mcpp >= 2026.11). The index client floor is unchanged.
 # 2026-10-30: measurement engine 2026.10.31.1, the workflow's (openkal-platform 0.18.0 and later
@@ -144,7 +147,7 @@ toolchain = "llvm@22.1.8"
 # openkal-musl 0.16.0 and openkal-llvm-runtime 0.12.0), because a pin that
 # moves onto an unreachable or divergent asset fails every member at once and
 # reports it as a compatibility result.
-mcpp      = "2026.11.2.1"
+mcpp      = "2026.11.3.1"
 
 # The Windows target is named for the C environment the graph presents there,
 # which is musl's (openkal-musl declares `[c-abi] presents = "posix"`), not