diff --git a/Makefile b/Makefile
index eecb4d0..e898e50 100755
--- a/Makefile
+++ b/Makefile
@@ -29,7 +29,7 @@ IS_LIBRARY:=1
 # Be sure that your header files are in the include directory inside of a folder with the
 # same name as what you set LIBNAME to below.
 LIBNAME:=units
-VERSION:=0.5.1
+VERSION:=0.5.2
 # EXCLUDE_SRC_FROM_LIB= $(SRCDIR)/unpublishedfile.c
 # this line excludes opcontrol.c and similar files
 EXCLUDE_SRC_FROM_LIB+=$(foreach file, $(SRCDIR)/main,$(foreach cext,$(CEXTS),$(file).$(cext)) $(foreach cxxext,$(CXXEXTS),$(file).$(cxxext)))