diff --git a/Makefile b/Makefile
index d18dbf7c..a7b73a1d 100644
--- a/Makefile
+++ b/Makefile
@@ -11,7 +11,7 @@ DESTDIR=
 
 # Package name & version.
 PACKAGE=m*lib-$(VERSION)
-VERSION=0.3.0
+VERSION=0.3.1
 
 # Define the contain of the distribution tarball
 HEADER=m-algo.h m-array.h m-atomic.h m-bitset.h m-bptree.h m-buffer.h m-c-mempool.h m-concurrent.h m-core.h m-deque.h m-dict.h m-genint.h m-i-list.h m-i-shared.h m-list.h m-mempool.h m-mutex.h m-prioqueue.h m-rbtree.h m-serial-bin.h m-serial-json.h m-shared.h m-snapshot.h m-string.h m-tuple.h m-variant.h m-worker.h
diff --git a/m-core.h b/m-core.h
index e03e1647..49c9eeac 100644
--- a/m-core.h
+++ b/m-core.h
@@ -52,7 +52,7 @@
 /* Define M*LIB version */
 #define M_CORE_VERSION_MAJOR 0
 #define M_CORE_VERSION_MINOR 3
-#define M_CORE_VERSION_PATCHLEVEL 0
+#define M_CORE_VERSION_PATCHLEVEL 1
 
 /* M_ASSUME is equivalent to assert, but gives hints to compiler
    about how to optimize the code if NDEBUG is defined.