[Bugfix] Update the SGX SDK used in the runtime dockerfile (#532)

diff --git a/docker/teaclave-rt.ubuntu-1804.Dockerfile b/docker/teaclave-rt.ubuntu-1804.Dockerfile
index 5293795..a7189f0 100644
--- a/docker/teaclave-rt.ubuntu-1804.Dockerfile
+++ b/docker/teaclave-rt.ubuntu-1804.Dockerfile
@@ -1,8 +1,8 @@
 FROM ubuntu:18.04
 
 ENV VERSION 2.14.100.2-bionic1
-ENV SGX_DOWNLOAD_URL_BASE "https://download.01.org/intel-sgx/sgx-linux/2.12/distro/ubuntu18.04-server"
-ENV SGX_LINUX_X64_SDK sgx_linux_x64_sdk_2.12.100.3.bin
+ENV SGX_DOWNLOAD_URL_BASE "https://download.01.org/intel-sgx/sgx-linux/2.14/distro/ubuntu18.04-server"
+ENV SGX_LINUX_X64_SDK sgx_linux_x64_sdk_2.14.100.2.bin
 ENV SGX_LINUX_X64_SDK_URL "$SGX_DOWNLOAD_URL_BASE/$SGX_LINUX_X64_SDK"
 
 RUN apt-get update && apt-get install -q -y \