diff --git a/README.md b/README.md
index 9a79bc48c..f9c9a619e 100644
--- a/README.md
+++ b/README.md
@@ -5,39 +5,10 @@ Core
 We use v0.23.4 because v0.24 sucks
 
 ```shell
-$ wget https://github.com/libgit2/libgit2/archive/v0.23.4.zip
-$ unzip v0.23.4.zip
-```
-Install dependencies: `libssh2`, `http-parser`, `cmake`, `libcurl`.
-
-```shell
-On Mac OSX:
-$ brew install libssh2 http-parser cmake libcurl
-
-On CentOS:
-$ yum install libssh2-devel http-parser cmake libcurl-devel
-```
-Then install libgit2.
-
-```shell
-$ cmake .  -DCMAKE_VERBOSE_MAKEFILE=ON -Wno-dev -DUSE_SSH=YES
-$ make && make install
-```
-Note on Mac OSX may need to set CFLAGS="-std=c99".
-Now libgit2 is installed under `/usr/local/lib` as default. We still need to set pkg-config and link dynamic libraries.
-
-```shell
-On Mac OSX:
-$ cd /usr/local/lib/pkgconfig
-$ ln -s /path/to/libgit2/pkgconfig/libgit2.pc  libgit2.pc
-$ cd /usr/local/lib
-$ ln -s /path/to/libgit2/libgit2.23.dylib libgit2.23.dylib
-
-On CentOS:
-$ cd /usr/lib64/pkgconfig/
-$ ln -s /usr/local/lib/pkgconfig/libgit2.pc libgit2.pc
-$ cd /usr/lib64
-$ ln -s /usr/local/lib/libgit2.so.23 libgit2.so.23
+cp devtools/libgit2.rb.patch /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula
+cd  /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula
+git apply libgit2.rb.patch && git add libgit2.rb && git commit -m "patch libgit2 version for eru-core" && rm libgit2.rb.patch
+cd -
 ```
 
 ## setup dev environment
diff --git a/devtools/libgit2.rb.patch b/devtools/libgit2.rb.patch
new file mode 100644
index 000000000..b0bd1a261
--- /dev/null
+++ b/devtools/libgit2.rb.patch
@@ -0,0 +1,15 @@
+diff --git a/Formula/libgit2.rb b/Formula/libgit2.rb
+index b91f4ff..45205f1 100644
+--- a/Formula/libgit2.rb
++++ b/Formula/libgit2.rb
+@@ -1,8 +1,8 @@
+ class Libgit2 < Formula
+   desc "C library of Git core methods that is re-entrant and linkable"
+   homepage "https://libgit2.github.com/"
+-  url "https://github.com/libgit2/libgit2/archive/v0.24.2.tar.gz"
+-  sha256 "00f0a7403143fba69601accc80cacf49becc568b890ba232f300c1b2a37475e6"
++  url "https://github.com/libgit2/libgit2/archive/v0.23.4.tar.gz"
++  sha256 "c7f5e2d7381dbc4d7e878013d14f9993ae8a41bd23f032718e39ffba57894029"
+   head "https://github.com/libgit2/libgit2.git"
+ 
+   bottle do