diff --git a/src/amplxl/src/ampl_xl.hpp b/src/amplxl/src/ampl_xl.hpp
index e7da12c..996f521 100755
--- a/src/amplxl/src/ampl_xl.hpp
+++ b/src/amplxl/src/ampl_xl.hpp
@@ -70,7 +70,7 @@ void mymkstemp(std::string& tmpl, int pos);
 // some constants
 const int EXCEL_MAX_ROWS = 1048576;
 const std::string EXCEL_MAX_COLS = "XFD";
-const std::string version = "0.1.8";
+const std::string version = "0.1.9";
 
 
 const char* row_attr = "r";