diff --git a/coap/idf_component.yml b/coap/idf_component.yml
index bdc5b8b..24a5eb0 100644
--- a/coap/idf_component.yml
+++ b/coap/idf_component.yml
@@ -1,4 +1,4 @@
-version: "4.3.0~4"
+version: "4.3.1-rc.1"
 description: Constrained Application Protocol (CoAP) C Library
 url: https://github.com/espressif/idf-extra-components/tree/master/coap
 dependencies:
diff --git a/coap/libcoap b/coap/libcoap
index 8fbe440..7f551fc 160000
--- a/coap/libcoap
+++ b/coap/libcoap
@@ -1 +1 @@
-Subproject commit 8fbe440f8aaa68d6bfcb25e2ad8e68404a38f0ef
+Subproject commit 7f551fcea56b90351b013e672d0c1e632bbec609
diff --git a/coap/port/include/coap_config_posix.h b/coap/port/include/coap_config_posix.h
index d8fdd26..33acb54 100644
--- a/coap/port/include/coap_config_posix.h
+++ b/coap/port/include/coap_config_posix.h
@@ -47,7 +47,7 @@ struct in6_pktinfo {
 #define IPV6_PKTINFO IPV6_CHECKSUM
 
 #define PACKAGE_NAME "libcoap-posix"
-#define PACKAGE_VERSION "4.3.0"
+#define PACKAGE_VERSION "4.3.1-rc1"
 
 #ifdef CONFIG_MBEDTLS_TLS_ENABLED
 #define HAVE_MBEDTLS