diff --git a/pkgs/o/openkal-llvm-runtime.lua b/pkgs/o/openkal-llvm-runtime.lua
index 4e39047f..f1bbe62c 100644
--- a/pkgs/o/openkal-llvm-runtime.lua
+++ b/pkgs/o/openkal-llvm-runtime.lua
@@ -67,6 +67,13 @@ package = {
 
     xpm = {
         linux = {
+            ["0.15.1"] = {
+                url    = {
+                    GLOBAL = "https://github.com/mcpplibs/openkal-llvm-runtime/archive/refs/tags/0.15.1.tar.gz",
+                    CN     = "https://gitcode.com/mcpp-res/openkal-llvm-runtime/releases/download/0.15.1/openkal-llvm-runtime-0.15.1.tar.gz",
+                },
+                sha256 = "36c4715ebc7410a536dbc323c5ca451dc11c6f34c9d5b2b9910a2a565d7d102f",
+            },
             ["0.15.0"] = {
                 url    = {
                     GLOBAL = "https://github.com/mcpplibs/openkal-llvm-runtime/archive/refs/tags/0.15.0.tar.gz",
@@ -251,6 +258,13 @@ package = {
             },
         },
         macosx = {
+            ["0.15.1"] = {
+                url    = {
+                    GLOBAL = "https://github.com/mcpplibs/openkal-llvm-runtime/archive/refs/tags/0.15.1.tar.gz",
+                    CN     = "https://gitcode.com/mcpp-res/openkal-llvm-runtime/releases/download/0.15.1/openkal-llvm-runtime-0.15.1.tar.gz",
+                },
+                sha256 = "36c4715ebc7410a536dbc323c5ca451dc11c6f34c9d5b2b9910a2a565d7d102f",
+            },
             ["0.15.0"] = {
                 url    = {
                     GLOBAL = "https://github.com/mcpplibs/openkal-llvm-runtime/archive/refs/tags/0.15.0.tar.gz",
@@ -435,6 +449,13 @@ package = {
             },
         },
         windows = {
+            ["0.15.1"] = {
+                url    = {
+                    GLOBAL = "https://github.com/mcpplibs/openkal-llvm-runtime/archive/refs/tags/0.15.1.tar.gz",
+                    CN     = "https://gitcode.com/mcpp-res/openkal-llvm-runtime/releases/download/0.15.1/openkal-llvm-runtime-0.15.1.tar.gz",
+                },
+                sha256 = "36c4715ebc7410a536dbc323c5ca451dc11c6f34c9d5b2b9910a2a565d7d102f",
+            },
             ["0.15.0"] = {
                 url    = {
                     GLOBAL = "https://github.com/mcpplibs/openkal-llvm-runtime/archive/refs/tags/0.15.0.tar.gz",
diff --git a/tests/openkal/pins.toml b/tests/openkal/pins.toml
index 342a6176..907af142 100644
--- a/tests/openkal/pins.toml
+++ b/tests/openkal/pins.toml
@@ -4,7 +4,7 @@
 # `runtime` is the C++ runtime for openkal; it pins openkal-musl exactly, and
 # openkal-musl selects the openkal implementation for each target, so this one
 # version names the whole graph.
-runtime   = "0.15.0"
+runtime   = "0.15.1"
 toolchain = "llvm@22.1.8"
 # `mcpp` here moves together with index.toml's `min_mcpp` and
 # .github/workflows/openkal-compat.yml's own MCPP_VERSION (that workflow
@@ -18,6 +18,25 @@ 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.
 #
+# 2026-09-21 (third move): `runtime` -> 0.15.1, AND THIS ONE IS A WINDOWS FIX
+# REACHING THE MEASUREMENT THROUGH FOUR PACKAGES.
+#
+# 0.15.1 pins openkal-musl 0.19.1, which pins openkal-windows 0.10.1, which
+# makes a file opened for writing describable. `kal_fs_file_info` answers
+# through NtQueryInformationFile(FileBasicInformation), which requires
+# FILE_READ_ATTRIBUTES; `FILE_GENERIC_WRITE` does not carry it, so a
+# write-only handle held every right except the one needed to ask it about
+# itself, and `fstat` on a descriptor opened a line earlier returned EACCES.
+# libarchive performs that pair when opening an archive for output.
+#
+# Measured on three real-Windows conformance jobs: with the fix the query
+# answers 0, without it 6. Wine answers 0 either way, which is why the
+# Wine-backed windows column here could never have reported this and why a
+# consumer's own Windows job is what found it.
+#
+# Every link was registered, published and verified resolvable from the
+# PUBLISHED index before the next one's pin moved.
+
 # 2026-09-21 (second move): `mcpp` -> 2026.9.21.3, AND THIS ONE MOVES ALONE.
 #
 # THE HARNESS NOW NEEDS AN ENGINE FLAG. A target with no runner is measured