diff --git a/composer.lock b/composer.lock
index fa3b6e79..56de8c33 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1065,23 +1065,26 @@
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+            "version": "1.5.0",
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-                "reference": "567c9881dac19be5f16ee1039b6ac5b33617d4a3",
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+                "reference": "13a1a9f0468f43ae4f06bc23f766df2b8ba4aee4",
                 "shasum": ""
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             "require": {
                 "vlucas/phpdotenv": "*"
             },
             "require-dev": {
-                "pantheon-systems/pantheon-wp-coding-standards": "^2.0"
+                "pantheon-systems/pantheon-wp-coding-standards": "^2.0",
+                "pantheon-systems/wpunit-helpers": "^2.0",
+                "phpunit/phpunit": "^9",
+                "yoast/phpunit-polyfills": "^2.0"
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             "notification-url": "https://packagist.org/downloads/",
@@ -1091,9 +1094,9 @@
             "description": "Pantheon mu-plugin for WordPress sites.",
             "support": {
                 "issues": "https://github.com/pantheon-systems/pantheon-mu-plugin/issues",
-                "source": "https://github.com/pantheon-systems/pantheon-mu-plugin/tree/1.2.0"
+                "source": "https://github.com/pantheon-systems/pantheon-mu-plugin/tree/1.5.0"
             },
-            "time": "2023-09-14T16:42:48+00:00"
+            "time": "2024-07-29T19:20:35+00:00"
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-                "reference": "tags/2.7.2"
+                "reference": "tags/2.7.3"
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             "dist": {
                 "type": "zip",
-                "url": "https://downloads.wordpress.org/plugin/black-studio-tinymce-widget.2.7.2.zip"
+                "url": "https://downloads.wordpress.org/plugin/black-studio-tinymce-widget.2.7.3.zip"
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                 "url": "https://plugins.svn.wordpress.org/cf7-to-zapier/",
-                "reference": "tags/2.3.0"
+                "reference": "tags/2.4.0"
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             "dist": {
                 "type": "zip",
-                "url": "https://downloads.wordpress.org/plugin/cf7-to-zapier.2.3.0.zip"
+                "url": "https://downloads.wordpress.org/plugin/cf7-to-zapier.2.4.0.zip"
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@@ -2690,15 +2693,15 @@
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                 "url": "https://plugins.svn.wordpress.org/classic-editor/",
-                "reference": "tags/1.6.3"
+                "reference": "tags/1.6.4"
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             "dist": {
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-                "url": "https://downloads.wordpress.org/plugin/classic-editor.1.6.3.zip"
+                "url": "https://downloads.wordpress.org/plugin/classic-editor.1.6.4.zip"
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@@ -2744,15 +2747,15 @@
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-                "reference": "tags/5.7.7"
+                "reference": "tags/5.9.8"
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-                "url": "https://downloads.wordpress.org/plugin/contact-form-7.5.7.7.zip"
+                "url": "https://downloads.wordpress.org/plugin/contact-form-7.5.9.8.zip"
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-                "reference": "tags/1.14.0"
+                "reference": "tags/1.17.1"
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-                "url": "https://downloads.wordpress.org/plugin/custom-post-type-ui.1.14.0.zip"
+                "url": "https://downloads.wordpress.org/plugin/custom-post-type-ui.1.17.1.zip"
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-                "reference": "tags/4.1.4"
+                "reference": "tags/4.1.5"
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-                "url": "https://downloads.wordpress.org/plugin/enable-media-replace.4.1.4.zip"
+                "url": "https://downloads.wordpress.org/plugin/enable-media-replace.4.1.5.zip"
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@@ -2834,15 +2837,15 @@
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                 "url": "https://plugins.svn.wordpress.org/google-sitemap-generator/",
-                "reference": "tags/4.1.13"
+                "reference": "tags/4.1.21"
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-                "url": "https://downloads.wordpress.org/plugin/google-sitemap-generator.4.1.13.zip"
+                "url": "https://downloads.wordpress.org/plugin/google-sitemap-generator.4.1.21.zip"
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@@ -2870,15 +2873,15 @@
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                 "url": "https://plugins.svn.wordpress.org/media-library-assistant/",
-                "reference": "trunk"
+                "reference": "tags/3.18"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://downloads.wordpress.org/plugin/media-library-assistant.zip?timestamp=1696797213"
+                "url": "https://downloads.wordpress.org/plugin/media-library-assistant.3.18.zip"
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@@ -2906,15 +2909,15 @@
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+            "version": "3.3.7",
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                 "url": "https://plugins.svn.wordpress.org/page-links-to/",
-                "reference": "tags/3.3.6"
+                "reference": "tags/3.3.7"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://downloads.wordpress.org/plugin/page-links-to.3.3.6.zip"
+                "url": "https://downloads.wordpress.org/plugin/page-links-to.3.3.7.zip"
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@@ -2924,15 +2927,15 @@
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+            "version": "2.0.0",
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                 "type": "svn",
                 "url": "https://plugins.svn.wordpress.org/pantheon-advanced-page-cache/",
-                "reference": "tags/1.4.1"
+                "reference": "tags/2.0.0"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://downloads.wordpress.org/plugin/pantheon-advanced-page-cache.1.4.1.zip"
+                "url": "https://downloads.wordpress.org/plugin/pantheon-advanced-page-cache.2.0.0.zip"
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@@ -2942,15 +2945,15 @@
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                 "url": "https://plugins.svn.wordpress.org/redirection/",
-                "reference": "tags/5.3.10"
+                "reference": "tags/5.4.2"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://downloads.wordpress.org/plugin/redirection.5.3.10.zip"
+                "url": "https://downloads.wordpress.org/plugin/redirection.5.4.2.zip"
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@@ -2978,15 +2981,15 @@
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+            "version": "4.1.5",
             "source": {
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                 "url": "https://plugins.svn.wordpress.org/shortcode-variables/",
-                "reference": "tags/4.0.4"
+                "reference": "tags/4.1.5"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://downloads.wordpress.org/plugin/shortcode-variables.4.0.4.zip"
+                "url": "https://downloads.wordpress.org/plugin/shortcode-variables.4.1.5.zip"
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@@ -3014,15 +3017,15 @@
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                 "url": "https://plugins.svn.wordpress.org/ultimate-posts-widget/",
-                "reference": "tags/2.2.7"
+                "reference": "tags/2.3.2"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://downloads.wordpress.org/plugin/ultimate-posts-widget.2.2.7.zip"
+                "url": "https://downloads.wordpress.org/plugin/ultimate-posts-widget.2.3.2.zip"
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@@ -3104,15 +3107,15 @@
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+            "version": "0.8.2",
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                 "url": "https://plugins.svn.wordpress.org/wordpress-importer/",
-                "reference": "tags/0.8.1"
+                "reference": "tags/0.8.2"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://downloads.wordpress.org/plugin/wordpress-importer.0.8.1.zip"
+                "url": "https://downloads.wordpress.org/plugin/wordpress-importer.0.8.2.zip"
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@@ -3122,15 +3125,15 @@
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                 "url": "https://plugins.svn.wordpress.org/wp-mail-smtp/",
-                "reference": "tags/3.9.0"
+                "reference": "tags/3.11.1"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://downloads.wordpress.org/plugin/wp-mail-smtp.3.9.0.zip"
+                "url": "https://downloads.wordpress.org/plugin/wp-mail-smtp.3.11.1.zip"
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                 "url": "https://plugins.svn.wordpress.org/wp-native-php-sessions/",
-                "reference": "tags/1.3.6"
+                "reference": "tags/1.4.3"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://downloads.wordpress.org/plugin/wp-native-php-sessions.1.3.6.zip"
+                "url": "https://downloads.wordpress.org/plugin/wp-native-php-sessions.1.4.3.zip"
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-                "reference": "tags/4.5.3"
+                "reference": "tags/4.6.4"
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-                "url": "https://downloads.wordpress.org/plugin/wp-security-audit-log.4.5.3.zip"
+                "url": "https://downloads.wordpress.org/plugin/wp-security-audit-log.4.6.4.zip"
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+                "reference": "tags/7.21.0"
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-                "url": "https://downloads.wordpress.org/plugin/wp-sentry-integration.7.17.0.zip"
+                "url": "https://downloads.wordpress.org/plugin/wp-sentry-integration.7.21.0.zip"
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-                "reference": "tags/1.4.3"
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-                "url": "https://downloads.wordpress.org/plugin/wpcf7-recaptcha.1.4.3.zip"
+                "url": "https://downloads.wordpress.org/plugin/wpcf7-recaptcha.1.4.7.zip"
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