diff --git a/src/nn.h b/src/nn.h
index 1370d2d..3fc3126 100644
--- a/src/nn.h
+++ b/src/nn.h
@@ -67,13 +67,13 @@
 /*  www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html  */
 
 /*  The current interface version. */
-#define NN_VERSION_CURRENT 0
+#define NN_VERSION_CURRENT 1
 
 /*  The latest revision of the current interface. */
-#define NN_VERSION_REVISION 1
+#define NN_VERSION_REVISION 2
 
 /*  How many past interface versions are still supported. */
-#define NN_VERSION_AGE 0
+#define NN_VERSION_AGE 1
 
 /******************************************************************************/
 /*  Errors.                                                                   */