diff --git a/Makefile.am b/Makefile.am
index c79a2963..3cd2ef5d 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -11,7 +11,7 @@ VIMDIR=$(PREFIX)/share/vim
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = espeak-ng.pc
 
-SHARED_VERSION=2:49:1 # = *.so.1.1.49
+SHARED_VERSION=2:51:1 # = *.so.1.1.51
 
 MKDIR=mkdir -p