diff --git a/data/theme/gnome-shell-high-contrast.css b/data/theme/gnome-shell-high-contrast.css
index b4141f26d..1ed9a73fd 100644
--- a/data/theme/gnome-shell-high-contrast.css
+++ b/data/theme/gnome-shell-high-contrast.css
@@ -752,6 +752,17 @@ StScrollBar {
   color: rgba(255, 255, 255, 0.15);
   opacity: 0.5; }
 
+.calendar-week-number {
+  font-size: 70%;
+  font-weight: bold;
+  width: 2.8em;
+  height: 2em;
+  border-radius: 2px 1em 2px 2px;
+  padding: 0.9em 0 0;
+  margin: 3px;
+  background-color: rgba(255, 255, 255, 0.1);
+  color: #000; }
+
 /* Message list */
 .message-list {
   width: 31.5em; }
diff --git a/data/theme/gnome-shell-sass b/data/theme/gnome-shell-sass
index 63e059c92..9195df2df 160000
--- a/data/theme/gnome-shell-sass
+++ b/data/theme/gnome-shell-sass
@@ -1 +1 @@
-Subproject commit 63e059c9237a119bfe5bfef555060e6730263936
+Subproject commit 9195df2df751778b5ddea02c04f30fc1e4ffbe6e
diff --git a/data/theme/gnome-shell.css b/data/theme/gnome-shell.css
index c27df4ab4..7afda7cfe 100644
--- a/data/theme/gnome-shell.css
+++ b/data/theme/gnome-shell.css
@@ -752,6 +752,17 @@ StScrollBar {
   color: rgba(238, 238, 236, 0.15);
   opacity: 0.5; }
 
+.calendar-week-number {
+  font-size: 70%;
+  font-weight: bold;
+  width: 2.8em;
+  height: 2em;
+  border-radius: 2px 1em 2px 2px;
+  padding: 0.9em 0 0;
+  margin: 3px;
+  background-color: rgba(238, 238, 236, 0.1);
+  color: #393f3f; }
+
 /* Message list */
 .message-list {
   width: 31.5em; }