diff --git a/.github/workflows/openkal-compat.yml b/.github/workflows/openkal-compat.yml
index dfdcf6e0..8a610999 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: "2026.11.3.1"
+  MCPP_VERSION: "2026.11.7.1"
   # 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 ffa86365..500b70fb 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: "2026.11.3.1"
+  MCPP_VERSION: "2026.11.7.1"
 
 jobs:
   lint:
diff --git a/.github/workflows/xpkgindex-update.yml b/.github/workflows/xpkgindex-update.yml
index 38f74a2e..74f75693 100644
--- a/.github/workflows/xpkgindex-update.yml
+++ b/.github/workflows/xpkgindex-update.yml
@@ -25,7 +25,7 @@ concurrency:
 
 env:
   PYTHONUTF8: '1'
-  MCPP_VERSION: '2026.11.3.1'
+  MCPP_VERSION: '2026.11.7.1'
   # 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/tests/openkal/pins.toml b/tests/openkal/pins.toml
index 9e69269a..3fd39677 100644
--- a/tests/openkal/pins.toml
+++ b/tests/openkal/pins.toml
@@ -18,6 +18,8 @@ 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.
 #
+# 2026-11-07: measurement engine 2026.11.7.1 (version groups take part in
+# resolution; the built-in platform is a series) matches all CI workflows.
 # 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.
@@ -147,7 +149,7 @@ 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      = "2026.11.3.1"
+mcpp      = "2026.11.7.1"
 
 # 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