3.13.10 was a rather massive update and .11 adds a few fixes on top,
some of them for not too terrible security issues:

https://www.python.org/downloads/release/python-31310/
https://www.python.org/downloads/release/python-31311/

The annoying bit about this update is that our homegrown expat build
system does not install expat_config.h, which, strangely, is autoconf
results exposed in a public header (next to a few XML_ things). Until
that's sorted in base we get to patch the Python code since the expat
maintainer made the mitigation knobs only available behind some config
knobs, which the new Python code assumes to be enabled.

Index: Makefile
===================================================================
RCS file: /cvs/ports/lang/python/3/Makefile,v
diff -u -p -r1.17 Makefile
--- Makefile	14 Nov 2025 17:46:17 -0000	1.17
+++ Makefile	10 Dec 2025 06:34:31 -0000
@@ -3,12 +3,15 @@
 # requirement of the PSF license, if it constitutes a change to
 # Python itself.
 
-FULL_VERSION =		3.13.9
+FULL_VERSION =		3.13.11
 SHARED_LIBS =		python3.13 0.0
 VERSION_SPEC =		>=3.13,<3.14
 PORTROACH =		limit:^3\.12
 
 AUTOCONF_VERSION =	2.71
+
+# XXX - should come from expat_config.h, which isn't installed in base
+CFLAGS +=	-DXML_DTD -DXML_GE=1
 
 CONFIGURE_ENV +=	ac_cv_working_openssl_hashlib=yes \
 	TCLTK_CFLAGS="-I${MODTCL_INCDIR} -I${MODTK_INCDIR} -I${X11BASE}/include" \
Index: distinfo
===================================================================
RCS file: /cvs/ports/lang/python/3/distinfo,v
diff -u -p -r1.8 distinfo
--- distinfo	14 Nov 2025 17:46:17 -0000	1.8
+++ distinfo	10 Dec 2025 06:34:31 -0000
@@ -1,2 +1,2 @@
-SHA256 (Python-3.13.9.tgz) = xMBmrxnJj7eDXUc769fiO+hPbph01H2545po7l0M41w=
-SIZE (Python-3.13.9.tgz) = 29289375
+SHA256 (Python-3.13.11.tgz) = A8/tvgbOIbxEzgkkXgkad/L+6eyb5cUgaQSKGBMAsgI=
+SIZE (Python-3.13.11.tgz) = 29362906
Index: files/CHANGES.OpenBSD
===================================================================
RCS file: /cvs/ports/lang/python/3/files/CHANGES.OpenBSD,v
diff -u -p -r1.3 CHANGES.OpenBSD
--- files/CHANGES.OpenBSD	14 Nov 2025 17:46:17 -0000	1.3
+++ files/CHANGES.OpenBSD	10 Dec 2025 06:34:31 -0000
@@ -22,5 +22,7 @@ which results in loading an incorrect ve
 
 7.  Adjust #ifdef to use LibreSSL's version of X509_STORE_get1_objects().
 
+8.  Work around expat_config.h missing from base.
+
 These changes are available in the OpenBSD CVS repository
 <http://www.openbsd.org/anoncvs.html> in ports/lang/python/3.
Index: patches/patch-Modules_pyexpat_c
===================================================================
RCS file: patches/patch-Modules_pyexpat_c
diff -N patches/patch-Modules_pyexpat_c
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ patches/patch-Modules_pyexpat_c	10 Dec 2025 06:34:31 -0000
@@ -0,0 +1,11 @@
+Index: Modules/pyexpat.c
+--- Modules/pyexpat.c.orig
++++ Modules/pyexpat.c
+@@ -10,7 +10,6 @@
+ #include <stdbool.h>
+ #include <stddef.h>               // offsetof()
+ 
+-#include "expat_config.h"
+ #include "expat.h"
+ #include "pyexpat.h"
+ 
Index: pkg/PLIST-main
===================================================================
RCS file: /cvs/ports/lang/python/3/pkg/PLIST-main,v
diff -u -p -r1.12 PLIST-main
--- pkg/PLIST-main	14 Nov 2025 17:46:17 -0000	1.12
+++ pkg/PLIST-main	10 Dec 2025 06:34:31 -0000
@@ -1805,7 +1805,7 @@ lib/python3.13/ensurepip/__pycache__/_un
 lib/python3.13/ensurepip/__pycache__/_uninstall.cpython-313.opt-2.pyc
 lib/python3.13/ensurepip/__pycache__/_uninstall.cpython-313.pyc
 lib/python3.13/ensurepip/_bundled/
-lib/python3.13/ensurepip/_bundled/pip-25.2-py3-none-any.whl
+lib/python3.13/ensurepip/_bundled/pip-25.3-py3-none-any.whl
 lib/python3.13/ensurepip/_uninstall.py
 lib/python3.13/enum.py
 lib/python3.13/filecmp.py