bump version to 2.15
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6a69d53..22c4d1c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,14 +5,14 @@
 
 # Based on configure.ac
 
-project(gperftools VERSION 2.14 LANGUAGES C CXX
+project(gperftools VERSION 2.15 LANGUAGES C CXX
         DESCRIPTION "Performance tools for C++"
         HOMEPAGE_URL https://github.com/gperftools/gperftools)
 
 # Update this value for every release!
-set(TCMALLOC_SO_VERSION 9.15.5)
-set(PROFILER_SO_VERSION 5.10.5)
-set(TCMALLOC_AND_PROFILER_SO_VERSION 10.10.6)
+set(TCMALLOC_SO_VERSION 9.16.5)
+set(PROFILER_SO_VERSION 5.11.5)
+set(TCMALLOC_AND_PROFILER_SO_VERSION 10.11.6)
 
 # The user can choose not to compile in the heap-profiler, the
 # heap-checker, or the cpu-profiler.  There's also the possibility
diff --git a/NEWS b/NEWS
index 88f04cb..64483c2 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,19 @@
+== 5 Jan 2024
+gperftools 2.15 is out!
+
+This release has the following bug fixes:
+
+* Xiaowei Wang has pointed out the pthread linking issue on cmake on
+  older glibcs (where -pthread is not implicit). See
+  https://github.com/gperftools/gperftools/pull/1473 for more details.
+
+* Mikael Simberg and Tom "spot" Callaway have pointed out the missing
+  symbols issue when linking PPC or i386
+  builds. https://github.com/gperftools/gperftools/issues/1474 has all
+  the details.
+
+Huge thanks to all contributors!
+
 == 31 Dec 2023
 gperftools 2.14 is out!
 
diff --git a/configure.ac b/configure.ac
index 3799cd9..68fd51c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4,12 +4,12 @@
 # make sure we're interpreted by some minimal autoconf
 AC_PREREQ([2.69])
 
-AC_INIT([gperftools],[2.14],[gperftools@googlegroups.com])
+AC_INIT([gperftools],[2.15],[gperftools@googlegroups.com])
 # Update this value for every release!  (A:B:C will map to foo.so.(A-C).C.B)
 # http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
-TCMALLOC_SO_VERSION=9:15:5
-PROFILER_SO_VERSION=5:10:5
-TCMALLOC_AND_PROFILER_SO_VERSION=10:10:6
+TCMALLOC_SO_VERSION=9:16:5
+PROFILER_SO_VERSION=5:11:5
+TCMALLOC_AND_PROFILER_SO_VERSION=10:11:6
 
 AC_SUBST(TCMALLOC_SO_VERSION)
 AC_SUBST(PROFILER_SO_VERSION)
diff --git a/src/windows/config.h b/src/windows/config.h
index d916189..547e47c 100644
--- a/src/windows/config.h
+++ b/src/windows/config.h
@@ -215,7 +215,7 @@
 #define PACKAGE_NAME "gperftools"
 
 /* Define to the full name and version of this package. */
-#define PACKAGE_STRING "gperftools 2.14"
+#define PACKAGE_STRING "gperftools 2.15"
 
 /* Define to the one symbol short name of this package. */
 #define PACKAGE_TARNAME "gperftools"
@@ -224,7 +224,7 @@
 #define PACKAGE_URL ""
 
 /* Define to the version of this package. */
-#define PACKAGE_VERSION "2.14"
+#define PACKAGE_VERSION "2.15"
 
 /* Always the empty-string on non-windows systems. On windows, should be
    "__declspec(dllexport)". This way, when we compile the dll, we export our
diff --git a/src/windows/gperftools/tcmalloc.h b/src/windows/gperftools/tcmalloc.h
index 3dbfa1c..6c76b16 100644
--- a/src/windows/gperftools/tcmalloc.h
+++ b/src/windows/gperftools/tcmalloc.h
@@ -43,9 +43,9 @@
 
 /* Define the version number so folks can check against it */
 #define TC_VERSION_MAJOR  2
-#define TC_VERSION_MINOR  14
+#define TC_VERSION_MINOR  15
 #define TC_VERSION_PATCH  ""
-#define TC_VERSION_STRING "gperftools 2.14"
+#define TC_VERSION_STRING "gperftools 2.15"
 
 #ifndef PERFTOOLS_NOTHROW