diff --git a/Include/internal/pycore_magic_number.h b/Include/internal/pycore_magic_number.h
index 1cc897c5a69469..09381f91646d19 100644
--- a/Include/internal/pycore_magic_number.h
+++ b/Include/internal/pycore_magic_number.h
@@ -277,8 +277,9 @@ Known values:
     Python 3.14a7 3622 (Store annotations in different class dict keys)
     Python 3.14a7 3623 (Add BUILD_INTERPOLATION & BUILD_TEMPLATE opcodes)
     Python 3.14b1 3624 (Don't optimize LOAD_FAST when local is killed by DELETE_FAST)
+    Python 3.15a1 3650
 
-    Python 3.15 will start with 3650
+    Python 3.16 will start with 3700
 
     Please don't copy-paste the same pre-release tag for new entries above!!!
     You should always use the *upcoming* tag. For example, if 3.12a6 came out
@@ -289,7 +290,7 @@ PC/launcher.c must also be updated.
 
 */
 
-#define PYC_MAGIC_NUMBER 3624
+#define PYC_MAGIC_NUMBER 3650
 /* This is equivalent to converting PYC_MAGIC_NUMBER to 2 bytes
    (little-endian) and then appending b'\r\n'. */
 #define PYC_MAGIC_NUMBER_TOKEN \
diff --git a/configure b/configure
index c51192f12c8223..6428bb2b477487 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.72 for python 3.14.
+# Generated by GNU Autoconf 2.72 for python 3.15.
 #
 # Report bugs to <https://github.com/python/cpython/issues/>.
 #
@@ -604,8 +604,8 @@ MAKEFLAGS=
 # Identity of this package.
 PACKAGE_NAME='python'
 PACKAGE_TARNAME='python'
-PACKAGE_VERSION='3.14'
-PACKAGE_STRING='python 3.14'
+PACKAGE_VERSION='3.15'
+PACKAGE_STRING='python 3.15'
 PACKAGE_BUGREPORT='https://github.com/python/cpython/issues/'
 PACKAGE_URL=''
 
@@ -1734,7 +1734,7 @@ if test "$ac_init_help" = "long"; then
   # Omit some internal or obsolete options to make the list less imposing.
   # This message is too long to be a string in the A/UX 3.1 sh.
   cat <<_ACEOF
-'configure' configures python 3.14 to adapt to many kinds of systems.
+'configure' configures python 3.15 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1800,7 +1800,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of python 3.14:";;
+     short | recursive ) echo "Configuration of python 3.15:";;
    esac
   cat <<\_ACEOF
 
@@ -1853,9 +1853,9 @@ Optional Features:
 Optional Packages:
   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
   --without-PACKAGE       do not use PACKAGE (same as --with-PACKAGE=no)
-  --with-build-python=python3.14
+  --with-build-python=python3.15
                           path to build python binary for cross compiling
-                          (default: _bootstrap_python or python3.14)
+                          (default: _bootstrap_python or python3.15)
   --with-pkg-config=[yes|no|check]
                           use pkg-config to detect build options (default is
                           check)
@@ -2103,7 +2103,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-python configure 3.14
+python configure 3.15
 generated by GNU Autoconf 2.72
 
 Copyright (C) 2023 Free Software Foundation, Inc.
@@ -2781,7 +2781,7 @@ cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by python $as_me 3.14, which was
+It was created by python $as_me 3.15, which was
 generated by GNU Autoconf 2.72.  Invocation command line was
 
   $ $0$ac_configure_args_raw
@@ -3892,7 +3892,7 @@ rm confdefs.h
 mv confdefs.h.new confdefs.h
 
 
-VERSION=3.14
+VERSION=3.15
 
 # Version number of Python's own shared library file.
 
@@ -34598,7 +34598,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by python $as_me 3.14, which was
+This file was extended by python $as_me 3.15, which was
 generated by GNU Autoconf 2.72.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -34662,7 +34662,7 @@ ac_cs_config_escaped=`printf "%s\n" "$ac_cs_config" | sed "s/^ //; s/'/'\\\\\\\\
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config='$ac_cs_config_escaped'
 ac_cs_version="\\
-python config.status 3.14
+python config.status 3.15
 configured by $0, generated by GNU Autoconf 2.72,
   with options \\"\$ac_cs_config\\"