diff --git a/CMakeLists.txt b/CMakeLists.txt
index 01cefc0f..b8f5ea38 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,7 +16,7 @@ project(
   LANGUAGES CXX C)
 
 set(LIBCOAP_API_VERSION 3)
-set(LIBCOAP_ABI_VERSION 3.2.0)
+set(LIBCOAP_ABI_VERSION 3.2.1)
 
 set(COAP_LIBRARY_NAME "coap-${LIBCOAP_API_VERSION}")
 
diff --git a/configure.ac b/configure.ac
index f8f66147..a4134126 100644
--- a/configure.ac
+++ b/configure.ac
@@ -28,7 +28,7 @@ m4_define([libcoap_release_state], [])
 # Set to libcoap software version when libcoap_release_state is reset to empty.
 m4_define([libcoap_pre_major_version], [4])
 m4_define([libcoap_pre_minor_version], [3])
-m4_define([libcoap_pre_micro_version], [4])
+m4_define([libcoap_pre_micro_version], [5])
 
 # concatenate the full libcoap version string
 m4_define([libcoap_version], [m4_format([%s.%s.%s%s], libcoap_major_version, libcoap_minor_version, libcoap_micro_version, libcoap_release_state)])
@@ -154,7 +154,7 @@ LT_INIT([shared static])
 #
 
 LT_LIBCOAP_CURRENT=5
-LT_LIBCOAP_REVISION=0
+LT_LIBCOAP_REVISION=1
 LT_LIBCOAP_AGE=2
 LIBCOAP_SO_VERSION=$LT_LIBCOAP_CURRENT.$LT_LIBCOAP_REVISION.$LT_LIBCOAP_AGE