diff --git a/inc/namespace.php b/inc/namespace.php
index b7a2777..e3e0e7f 100644
--- a/inc/namespace.php
+++ b/inc/namespace.php
@@ -27,19 +27,22 @@ function get_version() : ?int {
 	$core = $data['altis/core'] ?? null;
 	if ( ! $core ) {
 		// Uh… I guess there's no Altis here then!
-		return false;
+		return null;
 	}
 
+	// Cast to array for Composer v2 compat.
+	$core = (array) $core;
+
 	// Is this a dev version?
 	if ( substr( $core['version'], 0, 4 ) === 'dev-' ) {
-		return false;
+		return null;
 	}
 
 	$version = $core['version_normalized'];
 	$parts = explode( '.', $version, 2 );
 	if ( count( $parts ) < 2 ) {
 		// Invalid version, probably another development version.
-		return false;
+		return null;
 	}
 
 	$major = intval( $parts[0] );
diff --git a/inc/upgrades/namespace.php b/inc/upgrades/namespace.php
index d5f21df..a9124d1 100644
--- a/inc/upgrades/namespace.php
+++ b/inc/upgrades/namespace.php
@@ -1,4 +1,9 @@
 <?php
+/**
+ * Upgrade notice.
+ *
+ * @package altis/core
+ */
 
 namespace Altis\Upgrades;
 
@@ -25,44 +30,50 @@ function register_widget() {
 	}
 
 	add_action( 'admin_head-index.php', function () {
-?>
-<style>
-#altis-upgrade-warning {
-    position: relative;
-    margin: 40px 0 10px;
-    padding: 6px 10px;
-    border: 2px solid #df3232;
-    box-shadow: 0 1px 1px rgba(0, 0, 0, 0.04);
-    background: #fff;
-    font-size: 13px;
-    line-height: 1.7;
-}
-
-#altis-upgrade-warning h1 {
-	background: #df3232;
-	color: #f0f0f0;
-	padding: 6px 10px;
-	margin: -6px -10px 0;
-}
-
-#altis-upgrade-warning h1 .dashicons {
-	color: #df3232;
-	color: #f0f0f0;
-	font-size: 23px;
-	height: 23px;
-	width: 23px;
-	line-height: 1.3;
-}
-
-#altis-upgrade-warning p {
-	font-size: 14px;
-}
-
-#altis-upgrade-warning .button .dashicons-external {
-    line-height: 43px;
-}
-</style>
-<?php
+		?>
+		<style>
+			#altis-upgrade-warning {
+				position: relative;
+				margin: 40px 0 10px;
+				padding: 8px 12px;
+				border: 2px solid #df3232;
+				border-radius: 1px;
+				box-shadow: 0 1px 1px rgba(0, 0, 0, 0.04);
+				background: #fff;
+				font-size: 13px;
+				line-height: 1.7;
+			}
+
+			#altis-upgrade-warning h1 {
+				background: #df3232;
+				color: #f0f0f0;
+				padding: 8px 12px;
+				margin: -8px -12px 0;
+				font-weight: bold;
+			}
+
+			#altis-upgrade-warning h1 .dashicons {
+				color: #df3232;
+				color: #f0f0f0;
+				font-size: 23px;
+				height: 23px;
+				width: 23px;
+				line-height: 1.3;
+			}
+
+			#altis-upgrade-warning p {
+				font-size: 14px;
+			}
+
+			#altis-upgrade-warning p:last-of-type {
+				margin-bottom: 4px;
+			}
+
+			#altis-upgrade-warning .button .dashicons-external {
+				line-height: 43px;
+			}
+		</style>
+		<?php
 	} );
 
 	add_action( 'all_admin_notices', function () {
@@ -76,47 +87,95 @@ function register_widget() {
 }
 
 /**
- * Get the supported version information from altis-dxp.com
+ * Get the supported version information from docs.altis-dxp.com.
  *
  * @param bool $skip_cache True to override the cache.
- * @return array Data from altis-dxp.com
+ * @return array|null Data from altis-dxp.com
+ */
+function get_supported_version_info( bool $skip_cache = false ) : ?array {
+	$releases = wp_cache_get( 'releases', 'altis-core' );
+	if ( ! empty( $releases ) && ! $skip_cache ) {
+		return $releases;
+	}
+
+	// Fetch releases data.
+	$response = wp_remote_get( 'https://docs.altis-dxp.com/releases.json' );
+
+	// Handle any error response.
+	if ( is_wp_error( $response ) ) {
+		/**
+		 * The wp_remote_get error response.
+		 *
+		 * @var WP_Error $response
+		 */
+		trigger_error( $response->get_error_message(), E_USER_WARNING );
+		return null;
+	}
+
+	// Parse JSON.
+	$releases = json_decode( wp_remote_retrieve_body( $response ), ARRAY_A );
+	if ( json_last_error() !== JSON_ERROR_NONE ) {
+		trigger_error( json_last_error_msg(), E_USER_WARNING );
+		return null;
+	}
+
+	// Ensure releases are sorted by date.
+	array_multisort(
+		array_map( 'strtotime', array_column( $releases, 'date' ) ),
+		SORT_DESC,
+		$releases
+	);
+
+	wp_cache_set( 'releases', $releases, 'altis-core', WEEK_IN_SECONDS );
+
+	return $releases;
+}
+
+/**
+ * Get data for current version of Altis.
+ *
+ * @return array|null
  */
-function get_supported_version_info() {
-	return [
-		'supported' => [
-			4,
-			5,
-			6,
-			7,
-		],
-		'latest' => [
-			'version' => 7,
-			'date' => '2021-05-04',
-			'blog' => 'https://www.altis-dxp.com/foo/',
-		],
-	];
+function get_current_version_info() : ?array {
+	$releases = get_supported_version_info();
+	if ( empty( $releases ) ) {
+		return null;
+	}
+
+	$version = Altis\get_version();
+
+	foreach ( $releases as $release ) {
+		if ( $release['version'] === $version ) {
+			return $release;
+		}
+	}
+
+	return null;
 }
 
 /**
  * Is this site on the latest version of Altis?
  *
+ * If we can't resolve the release data assume current version is latest.
+ *
  * @return bool
  */
 function is_version_latest() : bool {
 	$version = Altis\get_version();
-	$support = get_supported_version_info();
-	return $version === $support['latest']['version'];
+	$releases = get_supported_version_info();
+	return $version === ( $releases[0]['version'] ?? $version );
 }
 
 /**
  * Is this site on a supported version of Altis?
  *
+ * If version information cannot be resolved assume it is supported.
+ *
  * @return bool
  */
 function is_version_supported() : bool {
-	$version = Altis\get_version();
-	$support = get_supported_version_info();
-	return in_array( $version, $support['supported'], true );
+	$release = get_current_version_info();
+	return $release['supported'] ?? true;
 }
 
 /**
@@ -126,53 +185,64 @@ function is_version_supported() : bool {
  */
 function render_widget() {
 	$version = Altis\get_version();
-	$info = get_supported_version_info();
+	$releases = get_supported_version_info();
+	if ( empty( $releases ) ) {
+		return;
+	}
+
+	$latest = $releases[0];
 
 	?>
 	<div class="wrap">
-	<div id="altis-upgrade-warning">
-		<h1>
-			<span aria-hidden="true" class="dashicons dashicons-warning"></span>
-			<span class="screen-reader-text"><?php esc_html_e( 'Warning:', 'altis' ) ?></span>
-			<?php esc_html_e( 'Altis Upgrade Required', 'altis' ) ?>
-		</h1>
-		<p><?php
-		echo esc_html( sprintf(
-			__( 'You are running an unsupported version of Altis (Altis v%d).', 'altis' ),
-			$version
-		) );
-		?></p>
-
-		<p><?php
-		echo clean_html( sprintf(
-			__( 'The latest version of Altis is <a href="%s">Altis v%d</a>, released on %s.', 'altis' ),
-			$info['latest']['blog'],
-			$info['latest']['version'],
-			date_i18n( get_option( 'date_format' ), strtotime( $info['latest']['date'] ) )
-		), 'a' );
-		?></p>
-
-		<p><?php esc_html_e( 'Newer versions of Altis are faster and come with new features included in your existing licensing cost.', 'altis' ) ?></p>
-
-		<p class="button-container">
-			<a
-				class="button button-primary button-hero"
-				href="https://docs.altis-dxp.com/guides/upgrading/"
-				target="_blank"
-				rel="noopener noreferrer"
-			>
-				<?php
-					echo clean_html( sprintf(
-						'%1$s <span class="screen-reader-text">%2$s</span>',
-						__( 'Learn more about Altis upgrades' ),
-						/* translators: Accessibility text. */
-						__( '(opens in a new tab)' )
-					), 'span' );
-				?>
-				<span aria-hidden="true" class="dashicons dashicons-external"></span>
-			</a>
-		</p>
-	</div>
+		<div id="altis-upgrade-warning">
+			<h1>
+				<span aria-hidden="true" class="dashicons dashicons-warning"></span>
+				<span class="screen-reader-text"><?php esc_html_e( 'Warning:', 'altis' ) ?></span>
+				<?php esc_html_e( 'Altis Upgrade Required', 'altis' ) ?>
+			</h1>
+			<p>
+			<?php
+				echo esc_html( sprintf(
+					__( 'You are running an unsupported version of Altis (Altis v%d).', 'altis' ),
+					$version
+				) );
+			?>
+			</p>
+
+			<p>
+			<?php
+				// phpcs:ignore
+				echo clean_html( sprintf(
+					__( 'The latest version of Altis is <a href="%s">Altis v%d</a>, released on %s.', 'altis' ),
+					$latest['blog'] ?: "https://github.com/humanmade/altis/releases/tag/{$latest['tag']}",
+					$latest['version'],
+					date_i18n( get_option( 'date_format' ), strtotime( $latest['date'] ) )
+				), 'a' );
+			?>
+			</p>
+
+			<p><?php esc_html_e( 'Newer versions of Altis are faster and come with new features included in your existing licensing cost.', 'altis' ) ?></p>
+
+			<p class="button-container">
+				<a
+					class="button button-primary button-hero"
+					href="https://docs.altis-dxp.com/guides/upgrading/"
+					target="_blank"
+					rel="noopener noreferrer"
+				>
+					<?php
+						// phpcs:ignore
+						echo clean_html( sprintf(
+							'%1$s <span class="screen-reader-text">%2$s</span>',
+							__( 'Learn more about Altis upgrades' ),
+							/* translators: Accessibility text. */
+							__( '(opens in a new tab)' )
+						), 'span' );
+					?>
+					<span aria-hidden="true" class="dashicons dashicons-external"></span>
+				</a>
+			</p>
+		</div>
 	</div>
 	<?php
 }