diff --git a/xs/src/libslic3r/libslic3r.h b/xs/src/libslic3r/libslic3r.h
index 0ac2ca4ce..578d335ee 100644
--- a/xs/src/libslic3r/libslic3r.h
+++ b/xs/src/libslic3r/libslic3r.h
@@ -36,7 +36,7 @@ void confess_at(const char *file, int line, const char *func, const char *pat, .
 #define __TRANS(s) s
 namespace Slic3r {
 
-constexpr auto SLIC3R_VERSION = "1.3.0";
+constexpr auto SLIC3R_VERSION = "1.3.1-dev";
 
 typedef long coord_t;
 typedef double coordf_t;