Bump version to Mbed TLS 2.21.0
diff --git a/library/CMakeLists.txt b/library/CMakeLists.txt
index 1544325..ed244a7 100644
--- a/library/CMakeLists.txt
+++ b/library/CMakeLists.txt
@@ -175,14 +175,14 @@
 if(USE_SHARED_MBEDTLS_LIBRARY)
 
     add_library(mbedx509 SHARED ${src_x509})
-    set_target_properties(mbedx509 PROPERTIES VERSION 2.20.0 SOVERSION 1)
+    set_target_properties(mbedx509 PROPERTIES VERSION 2.21.0 SOVERSION 1)
     target_link_libraries(mbedx509 ${libs} mbedcrypto)
     target_include_directories(mbedx509
         PUBLIC ${MBEDTLS_DIR}/include/
         PUBLIC ${MBEDTLS_DIR}/crypto/include/)
 
     add_library(mbedtls SHARED ${src_tls})
-    set_target_properties(mbedtls PROPERTIES VERSION 2.20.0 SOVERSION 13)
+    set_target_properties(mbedtls PROPERTIES VERSION 2.21.0 SOVERSION 13)
     target_link_libraries(mbedtls ${libs} mbedx509)
     target_include_directories(mbedtls
         PUBLIC ${MBEDTLS_DIR}/include/