diff --git a/wp-content/themes/twentyseventeen/assets/css/blocks.css b/wp-content/themes/twentyseventeen/assets/css/blocks.css
index ba92e94e5a..350f49e930 100644
--- a/wp-content/themes/twentyseventeen/assets/css/blocks.css
+++ b/wp-content/themes/twentyseventeen/assets/css/blocks.css
@@ -196,6 +196,12 @@ p.has-drop-cap:not(:focus)::first-letter {
 	text-align: right;
 }
 
+/* Calendar */
+
+.wp-block-calendar th {
+	text-align: center;
+}
+
 /*--------------------------------------------------------------
 4.0 Blocks - Layout Elements
 --------------------------------------------------------------*/
diff --git a/wp-content/themes/twentyseventeen/assets/css/editor-blocks.css b/wp-content/themes/twentyseventeen/assets/css/editor-blocks.css
index d6976f15d3..0937f936b3 100644
--- a/wp-content/themes/twentyseventeen/assets/css/editor-blocks.css
+++ b/wp-content/themes/twentyseventeen/assets/css/editor-blocks.css
@@ -709,6 +709,12 @@ table.wp-block-table td:last-child {
 	text-align: right;
 }
 
+/* Calendar */
+
+.editor-styles-wrapper .wp-block-calendar th {
+	text-align: center;
+}
+
 /* Verse */
 
 .editor-styles-wrapper .wp-block-verse {
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 098839b470..d8b61c4751 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.6-beta3-58460';
+$wp_version = '6.6-beta3-58461';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.