diff --git a/core/build.sh b/core/build.sh
index 56acb50..0c37639 100755
--- a/core/build.sh
+++ b/core/build.sh
@@ -15,8 +15,8 @@ echo "- translating from Python to C"
 cython -f -3 --fast-fail -X embedsignature=True cython_types.pyx -o cython_types.c || die "translating"
 
 echo "- compiling and linking"
-gcc $CFLAGS -I/usr/include/python3.4 -pthread -c cython_types.c || die "compilation"
-gcc $LFLAGS -L/usr/lib -lpython3.4 cython_types.o -o cython_types.so || die "linking"
+gcc $CFLAGS -I/usr/include/python3.5 -pthread -c cython_types.c || die "compilation"
+gcc $LFLAGS -L/usr/lib -lpython3.5 cython_types.o -o cython_types.so || die "linking"
 rm -f cython_types.{c,o}
 
 echo "- done"