bump version to 2.9.1
diff --git a/CMakeLists.txt b/CMakeLists.txt
index b217d52..05e37ee 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,9 +10,9 @@
         HOMEPAGE_URL http://code.google.com/p/gperftools/)
 
 # Update this value for every release!
-set(TCMALLOC_SO_VERSION 9.8.5)
-set(PROFILER_SO_VERSION 5.3.5)
-set(TCMALLOC_AND_PROFILER_SO_VERSION 10.3.6)
+set(TCMALLOC_SO_VERSION 9.9.5)
+set(PROFILER_SO_VERSION 5.4.5)
+set(TCMALLOC_AND_PROFILER_SO_VERSION 10.4.6)
 
 # 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 1f7da6b..44095ec 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,15 @@
+== 2 March 2021 ==
+gperftools 2.9.1 is out!
+
+Minor fixes landed since previous release:
+
+* OSX builds new prefer backtrace() and have somewhat working heap
+  sampling.
+
+* Incorrect assertion failure was fixed that crashed tcmalloc if
+  assertions were on and sized delete was used. More details in github
+  issue #1254.
+
 == 21 February 2021 ==
 gperftools 2.9 is out!
 
@@ -19,8 +31,8 @@
 
 Here are notable changes:
 
-* Jarno Rajahalme has contributed fix crashing bug in syscalls support
-  for aarch64.
+* Jarno Rajahalme has contributed fix for crashing bug in syscalls
+  support for aarch64.
 
 * User SSE4 has contributed basic support for Elbrus 2000 architecture
   (!)
diff --git a/configure.ac b/configure.ac
index dbbbbf8..c419d5f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4,12 +4,12 @@
 # make sure we're interpreted by some minimal autoconf
 AC_PREREQ([2.59])
 
-AC_INIT([gperftools],[2.9.0],[gperftools@googlegroups.com])
+AC_INIT([gperftools],[2.9.1],[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=9:8:5
-PROFILER_SO_VERSION=5:3:5
-TCMALLOC_AND_PROFILER_SO_VERSION=10:3:6
+TCMALLOC_SO_VERSION=9:9:5
+PROFILER_SO_VERSION=5:4:5
+TCMALLOC_AND_PROFILER_SO_VERSION=10:4:6
 
 AC_SUBST(TCMALLOC_SO_VERSION)
 AC_SUBST(PROFILER_SO_VERSION)
diff --git a/src/windows/config.h b/src/windows/config.h
index 250579a..bd520e4 100644
--- a/src/windows/config.h
+++ b/src/windows/config.h
@@ -234,7 +234,7 @@
 #define PACKAGE_NAME "gperftools"
 
 /* Define to the full name and version of this package. */
-#define PACKAGE_STRING "gperftools 2.8.1"
+#define PACKAGE_STRING "gperftools 2.9.1"
 
 /* Define to the one symbol short name of this package. */
 #define PACKAGE_TARNAME "gperftools"
@@ -243,7 +243,7 @@
 #define PACKAGE_URL ""
 
 /* Define to the version of this package. */
-#define PACKAGE_VERSION "2.8.1"
+#define PACKAGE_VERSION "2.9.1"
 
 /* How to access the PC from a struct ucontext */
 /* #undef PC_FROM_UCONTEXT */
@@ -279,7 +279,7 @@
 /* #undef TCMALLOC_PAGE_SIZE_SHIFT */
 
 /* Version number of package */
-#define VERSION "2.9.0"
+#define VERSION "2.9.1"
 
 /* C99 says: define this to get the PRI... macros from stdint.h */
 #ifndef __STDC_FORMAT_MACROS
diff --git a/src/windows/gperftools/tcmalloc.h b/src/windows/gperftools/tcmalloc.h
index f072a5b..5116b29 100644
--- a/src/windows/gperftools/tcmalloc.h
+++ b/src/windows/gperftools/tcmalloc.h
@@ -44,8 +44,8 @@
 /* Define the version number so folks can check against it */
 #define TC_VERSION_MAJOR  2
 #define TC_VERSION_MINOR  9
-#define TC_VERSION_PATCH  ".0"
-#define TC_VERSION_STRING "gperftools 2.9.0"
+#define TC_VERSION_PATCH  ".1"
+#define TC_VERSION_STRING "gperftools 2.9.1"
 
 #ifndef PERFTOOLS_NOTHROW