diff --git a/ChangeLog b/ChangeLog
index 7768913..886a9f2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,6 @@
+Release 1.0.2 - TBD
+- jemalloc v5.0.1
+
 Release 1.0.1 - 2015/01/15
 - just exec without spawn
 
diff --git a/Gemfile.lock b/Gemfile.lock
index b2daf8a..360f947 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    jemalloc (1.0.1)
+    jemalloc (1.0.2)
 
 GEM
   remote: https://rubygems.org/
@@ -18,3 +18,6 @@ DEPENDENCIES
   jemalloc!
   rake (>= 0.8.7)
   rake-compiler (~> 0.7.1)
+
+BUNDLED WITH
+   1.13.5
diff --git a/ext/jemalloc/extconf.rb b/ext/jemalloc/extconf.rb
index 010da49..8c74790 100644
--- a/ext/jemalloc/extconf.rb
+++ b/ext/jemalloc/extconf.rb
@@ -2,7 +2,7 @@
 require 'rbconfig'
 
 $stdout.sync = true
-pkg = "jemalloc-3.4.0"
+pkg = "jemalloc-5.0.1"
 
 def sys(cmd)
   puts "$ #{cmd}"
@@ -24,6 +24,8 @@ def sys(cmd)
   Dir.chdir(pkg) do
     # configure
     sys "./configure"
+    # generates some .h files
+    sys "make include/jemalloc/internal/private_namespace.h"
     # zone.c is only for Mac OS X
     if RbConfig::CONFIG['target_vendor'] != "apple"
       sys "rm -fR src/zone.c"
diff --git a/ext/jemalloc/jemalloc-3.4.0.tar.bz2 b/ext/jemalloc/jemalloc-3.4.0.tar.bz2
deleted file mode 100644
index 7ee12e7..0000000
Binary files a/ext/jemalloc/jemalloc-3.4.0.tar.bz2 and /dev/null differ
diff --git a/ext/jemalloc/jemalloc-5.0.1.tar.bz2 b/ext/jemalloc/jemalloc-5.0.1.tar.bz2
new file mode 100644
index 0000000..3262c19
Binary files /dev/null and b/ext/jemalloc/jemalloc-5.0.1.tar.bz2 differ
diff --git a/lib/jemalloc/version.rb b/lib/jemalloc/version.rb
index 0a33c05..0c99096 100644
--- a/lib/jemalloc/version.rb
+++ b/lib/jemalloc/version.rb
@@ -1,3 +1,3 @@
 module JEMalloc
-  VERSION = "1.0.1"
+  VERSION = "1.0.2"
 end