diff --git a/winbuild/config.py b/winbuild/config.py
index 5d320f306..e755577b5 100644
--- a/winbuild/config.py
+++ b/winbuild/config.py
@@ -55,15 +55,15 @@ libs = {
         'version': '8.5.19',
     },
     'tcl-8.6': {
-        'url': SF_MIRROR+'/project/tcl/Tcl/8.6.7/tcl867-src.zip',
-        'filename': PILLOW_DEPENDS_DIR + 'tcl867-src.zip',
+        'url': SF_MIRROR+'/project/tcl/Tcl/8.6.8/tcl868-src.zip',
+        'filename': PILLOW_DEPENDS_DIR + 'tcl868-src.zip',
         'dir': '',
     },
     'tk-8.6': {
-        'url': SF_MIRROR+'/project/tcl/Tcl/8.6.7/tk867-src.zip',
-        'filename': PILLOW_DEPENDS_DIR + 'tk867-src.zip',
+        'url': SF_MIRROR+'/project/tcl/Tcl/8.6.8/tk868-src.zip',
+        'filename': PILLOW_DEPENDS_DIR + 'tk868-src.zip',
         'dir': '',
-        'version': '8.6.7',
+        'version': '8.6.8',
     },
     'webp': {
         'url': 'http://downloads.webmproject.org/releases/webp/libwebp-0.6.1.tar.gz',