diff --git a/.gitignore b/.gitignore
index 41c12d5..6e479ff 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,4 @@ usersguide.pdf
 /cgnslib-3.3.1.tar.gz
 /cgnslib-3.4.0.tar.gz
 /cgnslib-3.4.1.tar.gz
+/cgnslib-4.0.0.tar.gz
diff --git a/cgnslib.spec b/cgnslib.spec
index d213428..d68c69e 100644
--- a/cgnslib.spec
+++ b/cgnslib.spec
@@ -1,7 +1,7 @@
 %undefine _ld_as_needed
 
 Name:           cgnslib
-Version:        3.4.1
+Version:        4.0.0
 Release:        1%{?dist}
 Summary:        Computational Fluid Dynamics General Notation System
 License:        zlib
@@ -121,7 +121,7 @@ export LD_LIBRARY_PATH=%{buildroot}%{_libdir}
 %{_bindir}/hdf2adf
 %{_bindir}/unitconv
 %{_datadir}/cgnstools/
-%{_libdir}/libcgns.so.3.4.1
+%{_libdir}/libcgns.so.4.0
 
 %files devel
 %{_includedir}/cgnsBuild.defs
@@ -136,6 +136,9 @@ export LD_LIBRARY_PATH=%{buildroot}%{_libdir}
 %{_fmoddir}/cgns.mod
 
 %changelog
+* Fri Feb 21 2020 Sandro Mani <manisandro@gmail.com> - 4.0.0-1
+- Update to 4.0.0
+
 * Mon Feb 17 2020 Sandro Mani <manisandro@gmail.com> - 3.4.1-1
 - Update to 3.4.1
 
diff --git a/sources b/sources
index bb6e874..2d8d474 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (cgnslib-3.4.1.tar.gz) = 85cba56440e1ca60c7fed850adefc48dfffcd6d3a954a0ce0dc6bb17bd90e9bf8a64c368ed92a1a87624f143b28ba5dad8f4c46de3a922bad4c6d0af1f338f05
+SHA512 (cgnslib-4.0.0.tar.gz) = 5a5b686b4375073c5ae220a8d14551a2670e5aa30ba169a125bc066ab6c6264d57473aa9a9a1139e677775e4635667941715a8763c4ada7b93b7cb4a3d368014