diff --git a/gwenhywfar.spec b/gwenhywfar.spec
index d04367c..c5df0e1 100644
--- a/gwenhywfar.spec
+++ b/gwenhywfar.spec
@@ -1,7 +1,7 @@
 Summary: A multi-platform helper library for other libraries
 Name: gwenhywfar
-Version: 4.15.3
-Release: 9%{?dist}
+Version: 4.20.0
+Release: 1%{?dist}
 
 URL: http://www.aquamaniac.de/sites/download/packages.php?package=01&showall=1
 # Download is PHP form at http://www.aquamaniac.de/sites/download/packages.php
@@ -11,9 +11,9 @@ License: LGPLv2+
 Patch: gwenhywfar-3.4.1-pkgconfig.patch
 Patch2: gwen-gcc47.patch
 
-BuildRequires: cmake
+BuildRequires: cmake gcc gcc-c++
 BuildRequires: gnutls-devel gettext libgcrypt-devel openssl-devel
-BuildRequires: gtk2-devel >= 2.17.5
+BuildRequires: gtk3-devel >= 3.14.0
 BuildRequires: qt4-devel >= 4.3.0
 BuildRequires: qt5-qtbase-devel
 
@@ -31,16 +31,17 @@ Requires: %{name}%{?_isa} = %{version}-%{release}
 This package contains gwenhywfar-config and header files for writing and
 compiling programs using Gwenhywfar.
 
-%package gui-gtk2
-Summary: Gwenhywfar GUI framework for GTK2
+%package gui-gtk3
+
+Summary: Gwenhywfar GUI framework for GTK3
 Requires: %{name}%{?_isa} = %{version}-%{release}
-%description gui-gtk2
-This package contains the gtk2 gwenhywfar GUI backend.
+%description gui-gtk3
+This package contains the gtk3 gwenhywfar GUI backend.
 
-%package gui-gtk2-devel
-Summary: Development files for %{name}-gui-gtk2
+%package gui-gtk3-devel
+Summary: Development files for %{name}-gui-gtk3
 Requires: %{name}%{?_isa} = %{version}-%{release}
-%description gui-gtk2-devel
+%description gui-gtk3-devel
 %{summary}.
 
 %package gui-cpp
@@ -94,7 +95,8 @@ export PATH=$PATH:%{_qt5_bindir}
 
 %configure \
   --disable-static\
-  --with-guis="gtk2 qt4 qt5" \
+  --enable-system-certs \
+  --with-guis="gtk3 qt4 qt5" \
   --with-openssl-libs=%{_libdir} \
   --with-qt4-libs=%{_qt4_libdir} --with-qt4-includes=%{_qt4_headerdir} \
   --with-qt4-moc=%{_bindir}/moc-qt4 \
@@ -149,15 +151,15 @@ find $RPM_BUILD_ROOT -name *.la -exec rm -fv {} \;
 %{_datadir}/%{name}/typemaker*
 %{_libdir}/pkgconfig/gwenhywfar.pc
 
-%ldconfig_scriptlets gui-gtk2
+%ldconfig_scriptlets gui-gtk3
 
-%files gui-gtk2
-%{_libdir}/libgwengui-gtk2.so.*
+%files gui-gtk3
+%{_libdir}/libgwengui-gtk3.so.*
 
-%files gui-gtk2-devel
-%{_libdir}/libgwengui-gtk2.so
-%{_libdir}/pkgconfig/gwengui-gtk2.pc
-%{_includedir}/gwenhywfar4/gwen-gui-gtk2/
+%files gui-gtk3-devel
+%{_libdir}/libgwengui-gtk3.so
+%{_libdir}/pkgconfig/gwengui-gtk3.pc
+%{_includedir}/gwenhywfar4/gwen-gui-gtk3/
 
 %ldconfig_scriptlets gui-qt4
 
@@ -188,6 +190,10 @@ find $RPM_BUILD_ROOT -name *.la -exec rm -fv {} \;
 %{_includedir}/gwenhywfar4/gwen-gui-qt5/
 
 %changelog
+* Tue Apr 03 2018 Bill Nottingham <notting@splat.cc> - 4.20.0-1
+- update to 4.20.0
+- s/gtk2/gtk3/
+
 * Mon Mar 19 2018 Rex Dieter <rdieter@fedoraproject.org> - 4.15.3-9
 - spilt out gui-{cpp,gtk2,qt4,qt5}-devel
 
diff --git a/sources b/sources
index ca58a13..7410f71 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-4e96e68482a3cf1cfc00bd3645684c82  gwenhywfar-4.15.3.tar.gz
+SHA512 (gwenhywfar-4.20.0.tar.gz) = bc1d47c39654940198396f1bdb9f4a87ff4e0e6b07cb4525c10f7f8e6ce93445d5b9d85586a47c93c558e86eb826f7006eca29b93fad6371dfe72830bf9b88e1