diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2c9efd4..1b7dde7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -44,7 +44,6 @@ link_directories("${CMAKE_INSTALL_PREFIX}/lib")
 # external libs
 include(cmake/embear_logger.cmake)
 include(cmake/keccak.cmake)
-include(cmake/mbedtls.cmake)
 include(cmake/unity.cmake)
 include(cmake/uthash.cmake)
 
@@ -157,16 +156,12 @@ add_dependencies(common
   ext_uthash
   ext_keccak
   ext_embear_logger
-  ext_mbedtls
 )
 
 target_link_libraries(common PUBLIC 
   Threads::Threads
   keccak
-  logger
-  mbedtls
-  mbedcrypto
-  mbedx509)
+  logger)
 
 # install
 install(TARGETS common DESTINATION "${CMAKE_INSTALL_PREFIX}/lib")
diff --git a/README.md b/README.md
index 8e1c266..207b877 100644
--- a/README.md
+++ b/README.md
@@ -91,9 +91,6 @@ target_include_directories(<target> <PRIVATE|PUBLIC>
 target_link_libraries(<target> <PRIVATE|PUBLIC>
   logger
   keccak
-  mbedtls
-  mbedcrypto
-  mbedx509
 )
 
 ```
diff --git a/cmake/mbedtls.cmake b/cmake/mbedtls.cmake
deleted file mode 100644
index 343db76..0000000
--- a/cmake/mbedtls.cmake
+++ /dev/null
@@ -1,58 +0,0 @@
-#[[
-Copyright (c) 2019 IOTA Stiftung
-https://github.com/iotaledger/iota_common
-
-Refer to the LICENSE file for licensing information
-]]
-
-if (NOT __MBEDTLS_INCLUDED)
-  set(__MBEDTLS_INCLUDED TRUE)
-
-  ExternalProject_Add(
-    mbedtls_download
-    PREFIX ${PROJECT_BINARY_DIR}/mbedtls
-    SOURCE_DIR ${PROJECT_BINARY_DIR}/mbedtls/src/ext_mbedtls
-    DOWNLOAD_DIR ${PROJECT_BINARY_DIR}/download
-    DOWNLOAD_NAME mbedtls_v2.17.0.tar.gz
-    URL https://github.com/ARMmbed/mbedtls/archive/mbedtls-2.17.0.tar.gz
-    URL_HASH SHA256=321a2c0220d9f75703e929c01dabba7b77da4cf2e39944897fc41d888bb1ef0d
-    CONFIGURE_COMMAND ""
-    INSTALL_COMMAND ""
-    BUILD_COMMAND ""
-    # for debug
-    # LOG_DOWNLOAD 1
-  )
-
-  ExternalProject_Add(
-    crypto_download
-    PREFIX ${PROJECT_BINARY_DIR}/mbedtls
-    SOURCE_DIR ${PROJECT_BINARY_DIR}/mbedtls/src/ext_mbedtls/crypto
-    DOWNLOAD_DIR ${PROJECT_BINARY_DIR}/download
-    DOWNLOAD_NAME crypto_a78c958b17d75ddf.tar.gz
-    URL https://github.com/ARMmbed/mbed-crypto/archive/a78c958b17d75ddf63d8dd17255b6379dcbf259f.tar.gz
-    URL_HASH SHA256=96538dde4fc400290b80651038f79079e910d7d29aece203a6378f885129f8cf
-    CONFIGURE_COMMAND ""
-    INSTALL_COMMAND ""
-    BUILD_COMMAND ""
-    # for debug
-    # LOG_DOWNLOAD 1
-  )
-
-  ExternalProject_Add(
-    ext_mbedtls
-    PREFIX ${PROJECT_BINARY_DIR}/mbedtls
-    DOWNLOAD_COMMAND ""
-    CMAKE_ARGS
-      -DENABLE_TESTING=Off 
-      -DENABLE_PROGRAMS=Off
-      -DCMAKE_INSTALL_PREFIX:STRING=${CMAKE_INSTALL_PREFIX}
-    #  -DCMAKE_TOOLCHAIN_FILE:STRING=${CMAKE_TOOLCHAIN_FILE}
-    # for debug
-    # LOG_CONFIGURE 1
-    # LOG_INSTALL 1
-  )
-
-  add_dependencies(crypto_download mbedtls_download )
-  add_dependencies(ext_mbedtls crypto_download)
-
-endif()
\ No newline at end of file