diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 2e88b6d5c..bffe343fb 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -78,14 +78,16 @@ jobs:
     steps:
       - name: Prepare CentOS 7 tools
         run: |
-          yum install -y epel-release
-          yum install -y git cmake gcc gcc-c++ libstdc++-static make openssl-devel libmicrohttpd-devel libuv-devel
+          yum install -y centos-release-scl epel-release
+          yum install -y devtoolset-9
+          yum install -y git cmake libstdc++-static openssl-devel libmicrohttpd-devel libuv-devel glibc-static libuv-static
       - name: Checkout code
         run: |
           git clone https://github.com/MoneroOcean/xmrig-proxy.git .
           git checkout ${GITHUB_REF:10}
       - name: Build project on CentOS 7
         run: |
+          source /opt/rh/devtoolset-9/enable
           cmake . -DWITH_TLS=OFF
           make -j$(nproc)
           cp src/config.json .
diff --git a/src/version.h b/src/version.h
index 185a236ce..db3dff1b1 100644
--- a/src/version.h
+++ b/src/version.h
@@ -28,7 +28,7 @@
 #define APP_ID        "xmrig-proxy"
 #define APP_NAME      "xmrig-proxy"
 #define APP_DESC      "XMRig Stratum proxy"
-#define APP_VERSION   "6.4.0-mo3"
+#define APP_VERSION   "6.4.0-mo4"
 #define APP_DOMAIN    "xmrig.com"
 #define APP_SITE      "www.xmrig.com"
 #define APP_COPYRIGHT "Copyright (C) 2016-2020 xmrig.com"