diff --git a/sources b/sources
index e363c40..d0bdc43 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-11dbbd425c3e0201f20d6a51482ce6c4  tk8.6.5-src.tar.gz
+55eb3530faf3ea484d13929727784d33  tk8.6.6rc1-src.tar.gz
diff --git a/tk-8.6.4-no-fonts-fix.patch b/tk-8.6.4-no-fonts-fix.patch
deleted file mode 100644
index 205a531..0000000
--- a/tk-8.6.4-no-fonts-fix.patch
+++ /dev/null
@@ -1,12 +0,0 @@
-diff -pruN tk8.6.4.orig/unix/tkUnixRFont.c tk8.6.4/unix/tkUnixRFont.c
---- tk8.6.4.orig/unix/tkUnixRFont.c	2015-02-27 02:13:18.000000000 +0900
-+++ tk8.6.4/unix/tkUnixRFont.c	2015-06-10 14:35:20.639365954 +0900
-@@ -259,7 +259,7 @@ InitFont(
-      */
- 
-     set = FcFontSort(0, pattern, FcTrue, NULL, &result);
--    if (!set) {
-+    if (!set || set->nfont == 0) {
- 	ckfree(fontPtr);
- 	return NULL;
-     }
diff --git a/tk-8.6.6-no-fonts-fix.patch b/tk-8.6.6-no-fonts-fix.patch
new file mode 100644
index 0000000..021e5f2
--- /dev/null
+++ b/tk-8.6.6-no-fonts-fix.patch
@@ -0,0 +1,13 @@
+diff --git a/unix/tkUnixRFont.c b/unix/tkUnixRFont.c
+index 36e5462..9e2caaf 100644
+--- a/unix/tkUnixRFont.c
++++ b/unix/tkUnixRFont.c
+@@ -268,7 +268,7 @@ InitFont(
+      */
+ 
+     set = FcFontSort(0, pattern, FcTrue, NULL, &result);
+-    if (!set) {
++    if (!set || set->nfont == 0) {
+ 	ckfree(fontPtr);
+ 	return NULL;
+     }
diff --git a/tk.spec b/tk.spec
index 53fbe5e..89c7b98 100644
--- a/tk.spec
+++ b/tk.spec
@@ -1,15 +1,16 @@
+%global prerelease rc1
 %define majorver 8.6
-%define vers %{majorver}.5
+%define vers %{majorver}.6
 
 Summary: The graphical toolkit for the Tcl scripting language
 Name: tk
 Version: %{vers}
-Release: 1%{?dist}
+Release: 0.1%{?prerelease:.%{prerelease}}%{?dist}
 Epoch:   1
 License: TCL
 Group: Development/Languages
 URL: http://tcl.sourceforge.net
-Source0: http://download.sourceforge.net/sourceforge/tcl/%{name}%{version}-src.tar.gz
+Source0: http://download.sourceforge.net/sourceforge/tcl/%{name}%{version}%{?prerelease}-src.tar.gz
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 Requires: tcl = %{epoch}:%{version}
 Requires(post): /sbin/ldconfig
@@ -25,7 +26,7 @@ Patch1: tk-8.6.5-make.patch
 Patch2: tk-8.6.3-conf.patch
 # fix implicit linkage of freetype that breaks xft detection (#677692)
 Patch3: tk-8.6.5-fix-xft.patch
-Patch4: tk-8.6.4-no-fonts-fix.patch
+Patch4: tk-8.6.6-no-fonts-fix.patch
 
 %description
 When paired with the Tcl scripting language, Tk provides a fast and powerful
@@ -115,6 +116,10 @@ sed -i -e "s|$PWD/unix|%{_libdir}|; s|$PWD|%{_includedir}/%{name}-private|" %{bu
 %{_datadir}/%{name}%{majorver}/tkAppInit.c
 
 %changelog
+* Mon Jul 25 2016 Jaroslav Škarvada <jskarvad@redhat.com> - 1:8.6.6-0.1.rc1
+- New version
+  Related: rhbz#1359463
+
 * Tue Mar 22 2016 Jaroslav Škarvada <jskarvad@redhat.com> - 1:8.6.5-1
 - New version
   Related: rhbz#1313909