diff --git a/wp-content/themes/twentytwentyone/assets/css/ie.css b/wp-content/themes/twentytwentyone/assets/css/ie.css
index de185ed9ab..1308620af3 100644
--- a/wp-content/themes/twentytwentyone/assets/css/ie.css
+++ b/wp-content/themes/twentytwentyone/assets/css/ie.css
@@ -6793,7 +6793,7 @@ h1.page-title {
 		width: inherit;
 	}
 
-	.primary-navigation > div > .menu-wrapper li:last-child() {
+	.primary-navigation > div > .menu-wrapper li:last-child {
 		margin-right: 0;
 	}
 }
@@ -7049,7 +7049,7 @@ h1.page-title {
 }
 @media only screen and (max-width: 481px) {
 
-	.primary-navigation .sub-menu .menu-item:last-child() {
+	.primary-navigation .sub-menu .menu-item:last-child {
 		margin-bottom: 0;
 	}
 }
diff --git a/wp-content/themes/twentytwentyone/assets/sass/06-components/navigation.scss b/wp-content/themes/twentytwentyone/assets/sass/06-components/navigation.scss
index 88919dc350..c62ef26bd8 100644
--- a/wp-content/themes/twentytwentyone/assets/sass/06-components/navigation.scss
+++ b/wp-content/themes/twentytwentyone/assets/sass/06-components/navigation.scss
@@ -222,7 +222,7 @@
 				margin: 0;
 				width: inherit;
 
-				&:last-child() {
+				&:last-child {
 					margin-right: 0;
 				}
 			}
@@ -456,7 +456,7 @@
 
 			@include media(mobile-only) {
 
-				&:last-child() {
+				&:last-child {
 					margin-bottom: 0;
 				}
 
diff --git a/wp-content/themes/twentytwentyone/style-rtl.css b/wp-content/themes/twentytwentyone/style-rtl.css
index ceee2b394c..bdcdc6c873 100644
--- a/wp-content/themes/twentytwentyone/style-rtl.css
+++ b/wp-content/themes/twentytwentyone/style-rtl.css
@@ -4855,7 +4855,7 @@ h1.page-title {
 		width: inherit;
 	}
 
-	.primary-navigation > div > .menu-wrapper li:last-child() {
+	.primary-navigation > div > .menu-wrapper li:last-child {
 		margin-left: 0;
 	}
 }
@@ -5062,7 +5062,7 @@ h1.page-title {
 }
 @media only screen and (max-width: 481px) {
 
-	.primary-navigation .sub-menu .menu-item:last-child() {
+	.primary-navigation .sub-menu .menu-item:last-child {
 		margin-bottom: 0;
 	}
 }
diff --git a/wp-content/themes/twentytwentyone/style.css b/wp-content/themes/twentytwentyone/style.css
index 249eb3434a..a0ef21ad16 100644
--- a/wp-content/themes/twentytwentyone/style.css
+++ b/wp-content/themes/twentytwentyone/style.css
@@ -4875,7 +4875,7 @@ h1.page-title {
 		width: inherit;
 	}
 
-	.primary-navigation > div > .menu-wrapper li:last-child() {
+	.primary-navigation > div > .menu-wrapper li:last-child {
 		margin-right: 0;
 	}
 }
@@ -5098,7 +5098,7 @@ h1.page-title {
 }
 @media only screen and (max-width: 481px) {
 
-	.primary-navigation .sub-menu .menu-item:last-child() {
+	.primary-navigation .sub-menu .menu-item:last-child {
 		margin-bottom: 0;
 	}
 }
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 371e4c7fff..070297f98a 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.7-alpha-49913';
+$wp_version = '5.7-alpha-49914';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.