diff --git a/includes/WPStrava.php b/includes/WPStrava.php
index 56867dd..449f347 100644
--- a/includes/WPStrava.php
+++ b/includes/WPStrava.php
@@ -154,7 +154,7 @@ class WPStrava {
 	 */
 	public function register_scripts() {
 		// Register a personalized stylesheet.
-		wp_register_style( 'wp-strava-style', WPSTRAVA_PLUGIN_URL . 'css/wp-strava.css' );
+		wp_register_style( 'wp-strava-style', WPSTRAVA_PLUGIN_URL . 'css/wp-strava.css', array(), WPSTRAVA_PLUGIN_VERSION );
 	}
 
 	/**
@@ -175,4 +175,5 @@ class WPStrava {
 		new WPStrava_RouteShortcode();
 		new WPStrava_LatestMapShortcode();
 	}
+
 }
diff --git a/includes/WPStrava/Auth.php b/includes/WPStrava/Auth.php
index 670906e..0ae62ba 100644
--- a/includes/WPStrava/Auth.php
+++ b/includes/WPStrava/Auth.php
@@ -37,15 +37,30 @@ abstract class WPStrava_Auth {
 		$settings = WPStrava::get_instance()->settings;
 
 		// User is clearing to start-over, don't oauth, ignore other errors.
-		if ( isset( $_POST['strava_id'] ) && $settings->ids_empty( $_POST['strava_id'] ) ) {
+
+		$input_args = array(
+			'strava_id'            => array(
+				'filter' => FILTER_SANITIZE_NUMBER_INT,
+				'flags'  => FILTER_REQUIRE_ARRAY,
+			),
+			'strava_client_id'     => array(
+				'filter' => FILTER_SANITIZE_NUMBER_INT,
+				'flags'  => FILTER_REQUIRE_SCALAR,
+			),
+			'strava_client_secret' => FILTER_SANITIZE_STRING,
+		);
+
+		$input = filter_input_array( INPUT_POST, $input_args );
+
+		if ( $settings->ids_empty( $input['strava_id'] ) ) {
 			return array();
 		}
 
 		// Redirect only if all the right options are in place.
 		if ( $settings->is_settings_updated( $value ) && $settings->is_option_page() ) {
 			// Only re-auth if client ID and secret were saved.
-			if ( ! empty( $_POST['strava_client_id'] ) && ! empty( $_POST['strava_client_secret'] ) ) {
-				wp_redirect( $this->get_authorize_url( $_POST['strava_client_id'] ) );
+			if ( ! empty( $input['strava_client_id'] ) && ! empty( $input['strava_client_secret'] ) ) {
+				wp_redirect( $this->get_authorize_url( $input['strava_client_id'] ) );
 				exit();
 			}
 		}
@@ -55,10 +70,17 @@ abstract class WPStrava_Auth {
 	public function init() {
 		$settings = WPStrava::get_instance()->settings;
 
+		$input_args = array(
+			'settings-updated' => FILTER_SANITIZE_STRING,
+			'code'             => FILTER_SANITIZE_STRING,
+		);
+
+		$input = filter_input_array( INPUT_GET, $input_args );
+
 		//only update when redirected back from strava
-		if ( ! isset( $_GET['settings-updated'] ) && $settings->is_settings_page() ) {
-			if ( isset( $_GET['code'] ) ) {
-				$info = $this->token_exchange_initial( $_GET['code'] );
+		if ( ! isset( $input['settings-updated'] ) && $settings->is_settings_page() ) {
+			if ( isset( $input['code'] ) ) {
+				$info = $this->token_exchange_initial( $input['code'] );
 				if ( isset( $info->access_token ) ) {
 					// Translators: New strava token
 					add_settings_error( 'strava_token', 'strava_token', sprintf( __( 'New Strava token retrieved. %s', 'wp-strava' ), $this->feedback ), 'updated' );
@@ -80,7 +102,7 @@ abstract class WPStrava_Auth {
 
 	// Was fetch_token();
 	private function token_exchange_initial( $code ) {
-		$settings = WPStrava::get_instance()->settings;
+		$settings      = WPStrava::get_instance()->settings;
 		$client_id     = $settings->client_id;
 		$client_secret = $settings->client_secret;
 
@@ -117,7 +139,7 @@ abstract class WPStrava_Auth {
 	}
 
 	protected function token_request( $data ) {
-		$api  = new WPStrava_API();
+		$api = new WPStrava_API();
 		return $api->post( 'oauth/token', $data );
 	}
 
diff --git a/includes/WPStrava/LatestActivitiesWidget.php b/includes/WPStrava/LatestActivitiesWidget.php
index ea4b4c5..06b489a 100644
--- a/includes/WPStrava/LatestActivitiesWidget.php
+++ b/includes/WPStrava/LatestActivitiesWidget.php
@@ -30,12 +30,14 @@ class WPStrava_LatestActivitiesWidget extends WP_Widget {
 			'quantity'       => isset( $instance['quantity'] ) ? $instance['quantity'] : null,
 		);
 
+		// phpcs:disable WordPress.Security.EscapeOutput.OutputNotEscaped -- Widget OK.
 		echo $args['before_widget'];
 		if ( $title ) {
 			echo $args['before_title'] . $title . $args['after_title'];
 		}
 		echo WPStrava_LatestActivities::get_activities_html( $activities_args );
 		echo $args['after_widget'];
+		// phpcs:enable WordPress.Security.EscapeOutput.OutputNotEscaped
 	}
 
 	/** @see WP_Widget::update */
@@ -59,24 +61,24 @@ class WPStrava_LatestActivitiesWidget extends WP_Widget {
 
 		?>
 			<p>
-				<label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e( 'Title:', 'wp-strava' ); ?></label>
-				<input class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" type="text" value="<?php echo $title; ?>" />
+				<label for="<?php echo esc_attr( $this->get_field_id( 'title' ) ); ?>"><?php esc_html_e( 'Title:', 'wp-strava' ); ?></label>
+				<input class="widefat" id="<?php echo esc_attr( $this->get_field_id( 'title' ) ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'title' ) ); ?>" type="text" value="<?php echo esc_attr( $title ); ?>" />
 			</p>
 			<p>
-				<label for="<?php echo $this->get_field_id( 'client_id' ); ?>"><?php _e( 'Athlete:', 'wp-strava' ); ?></label>
-				<select name="<?php echo $this->get_field_name( 'client_id' ); ?>">
+				<label for="<?php echo esc_attr( $this->get_field_id( 'client_id' ) ); ?>"><?php esc_html_e( 'Athlete:', 'wp-strava' ); ?></label>
+				<select name="<?php echo esc_attr( $this->get_field_name( 'client_id' ) ); ?>">
 				<?php foreach ( $all_ids as $id => $nickname ) : ?>
-					<option value="<?php echo $id; ?>"<?php selected( $id, $client_id ); ?>><?php echo $nickname; ?></option>
+					<option value="<?php echo esc_attr( $id ); ?>"<?php selected( $id, $client_id ); ?>><?php echo esc_html( $nickname ); ?></option>
 				<?php endforeach; ?>
 				</select>
 			</p>
 			<p>
-				<label for="<?php echo $this->get_field_id( 'strava_club_id' ); ?>"><?php esc_html_e( 'Club ID (leave blank to show single Athlete):', 'wp-strava' ); ?></label>
-				<input class="widefat" id="<?php echo $this->get_field_id( 'strava_club_id' ); ?>" name="<?php echo $this->get_field_name( 'strava_club_id' ); ?>" type="text" value="<?php echo $strava_club_id; ?>" />
+				<label for="<?php echo esc_attr( $this->get_field_id( 'strava_club_id' ) ); ?>"><?php esc_html_e( 'Club ID (leave blank to show single Athlete):', 'wp-strava' ); ?></label>
+				<input class="widefat" id="<?php echo esc_attr( $this->get_field_id( 'strava_club_id' ) ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'strava_club_id' ) ); ?>" type="text" value="<?php echo esc_attr( $strava_club_id ); ?>" />
 			</p>
 			<p>
-				<label for="<?php echo $this->get_field_id( 'quantity' ); ?>"><?php esc_html_e( 'Quantity:', 'wp-strava' ); ?></label>
-				<input class="widefat" id="<?php echo $this->get_field_id( 'quantity' ); ?>" name="<?php echo $this->get_field_name( 'quantity' ); ?>" type="text" value="<?php echo $quantity; ?>" />
+				<label for="<?php echo esc_attr( $this->get_field_id( 'quantity' ) ); ?>"><?php esc_html_e( 'Quantity:', 'wp-strava' ); ?></label>
+				<input class="widefat" id="<?php echo esc_attr( $this->get_field_id( 'quantity' ) ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'quantity' ) ); ?>" type="text" value="<?php echo esc_html( $quantity ); ?>" />
 			</p>
 		<?php
 	}
diff --git a/includes/WPStrava/Settings.php b/includes/WPStrava/Settings.php
index dd76c98..41692ca 100644
--- a/includes/WPStrava/Settings.php
+++ b/includes/WPStrava/Settings.php
@@ -121,29 +121,35 @@ class WPStrava_Settings {
 
 		// Translators: Strava "app" description
 		$description = sprintf( __( 'WP-Strava for %s', 'wp-strava' ), $blog_name );
-		printf( __( "<p>Steps:</p>
-			<ol>
-				<li>Create your free API Application/Connection here: <a href='%1\$s'>%2\$s</a> using the following information:</li>
-				<ul>
-					<li>App Icon: <strong>upload <a href='%3\$s'>this image</a></strong></li>
-					<li>Application Name: <strong>%4\$s</strong></li>
-					<li>Category: OK to leave at default 'other'</li>
-					<li>Club: OK to leave blank</li>
-					<li>Website: <strong>%5\$s</strong></li>
-					<li>Application Description: <strong>%6\$s</strong></li>
-					<li>Authorization Callback Domain: <strong>%7\$s</strong></li>
-				</ul>
-				<li>Once you've created your API Application at strava.com, enter the <strong>Client ID</strong> and <strong>Client Secret</strong> below, which can now be found on that same strava API Settings page.
-				<li>After saving your Client ID and Secret, you'll be redirected to strava to authorize your API Application. If successful, your Strava ID will display in a table, next to your nickname.</li>
-				<li>If you need to re-authorize your API Application, erase your Strava ID next to your nickname and click 'Save Changes' to start over.</li>
-			</ol>", 'wp-strava' ),
-			$settings_url,
-			$settings_url,
-			$icon_url,
-			$app_name,
-			$site_url,
-			$description,
-			wp_parse_url( $site_url, PHP_URL_HOST )
+		echo wp_kses_post(
+			sprintf(
+				__(
+					"<p>Steps:</p>
+					<ol>
+						<li>Create your free API Application/Connection here: <a href='%1\$s'>%2\$s</a> using the following information:</li>
+						<ul>
+							<li>App Icon: <strong>upload <a href='%3\$s'>this image</a></strong></li>
+							<li>Application Name: <strong>%4\$s</strong></li>
+							<li>Category: OK to leave at default 'other'</li>
+							<li>Club: OK to leave blank</li>
+							<li>Website: <strong>%5\$s</strong></li>
+							<li>Application Description: <strong>%6\$s</strong></li>
+							<li>Authorization Callback Domain: <strong>%7\$s</strong></li>
+						</ul>
+						<li>Once you've created your API Application at strava.com, enter the <strong>Client ID</strong> and <strong>Client Secret</strong> below, which can now be found on that same strava API Settings page.
+						<li>After saving your Client ID and Secret, you'll be redirected to strava to authorize your API Application. If successful, your Strava ID will display in a table, next to your nickname.</li>
+						<li>If you need to re-authorize your API Application, erase your Strava ID next to your nickname and click 'Save Changes' to start over.</li>
+					</ol>",
+					'wp-strava'
+				),
+				$settings_url,
+				$settings_url,
+				$icon_url,
+				$app_name,
+				$site_url,
+				$description,
+				wp_parse_url( $site_url, PHP_URL_HOST )
+			)
 		);
 	}
 
@@ -155,11 +161,20 @@ class WPStrava_Settings {
 	 */
 	public function print_gmaps_instructions() {
 		$maps_url = 'https://developers.google.com/maps/documentation/static-maps/';
-		printf( __( "<p>Steps:</p>
-			<ol>
-				<li>To use Google map images, you must create a Static Maps API Key. Create a free key by going here: <a href='%1\$s'>%2\$s</a> and clicking <strong>Get a Key</strong></li>
-				<li>Once you've created your Google Static Maps API Key, enter the key below.
-			</ol>", 'wp-strava' ), $maps_url, $maps_url );
+		echo wp_kses_post(
+			sprintf(
+				__(
+					"<p>Steps:</p>
+					<ol>
+						<li>To use Google map images, you must create a Static Maps API Key. Create a free key by going here: <a href='%1\$s'>%2\$s</a> and clicking <strong>Get a Key</strong></li>
+						<li>Once you've created your Google Static Maps API Key, enter the key below.
+					</ol>",
+					'wp-strava'
+				),
+				$maps_url,
+				$maps_url
+			)
+		);
 	}
 
 	/**
@@ -205,7 +220,7 @@ class WPStrava_Settings {
 	public function print_nickname_input() {
 		$nickname = $this->ids_empty( $this->ids ) ? __( 'Default', 'wp-strava' ) : '';
 		?>
-		<input type="text" name="strava_nickname[]" value="<?php echo $nickname; ?>" />
+		<input type="text" name="strava_nickname[]" value="<?php echo esc_attr( $nickname ); ?>" />
 		<?php
 	}
 
@@ -268,7 +283,7 @@ class WPStrava_Settings {
 	}
 
 	/**
-	 * Sanitize the nicknames - make sure we've got the same number of nicknames sa IDs.
+	 * Sanitize the nicknames - make sure we've got the same number of nicknames and IDs.
 	 *
 	 * @param array $nicknames Nicknames for the athletes saved.
 	 * @return array
@@ -278,11 +293,20 @@ class WPStrava_Settings {
 	public function sanitize_nickname( $nicknames ) {
 		if ( ! $this->adding_athlete ) {
 
+			$input_args = array(
+				'strava_id' => array(
+					'filter' => FILTER_SANITIZE_NUMBER_INT,
+					'flags'  => FILTER_REQUIRE_ARRAY,
+				),
+			);
+
+			$input = filter_input_array( INPUT_POST, $input_args );
+
 			// Chop $nicknames to same size as ids.
-			$nicknames = array_slice( $nicknames, 0, count( $_POST['strava_id'] ) );
+			$nicknames = array_slice( $nicknames, 0, count( $input['strava_id'] ) );
 
 			// Remove indexes from $nicknames that have empty ids.
-			foreach ( $_POST['strava_id'] as $index => $id ) {
+			foreach ( $input['strava_id'] as $index => $id ) {
 				$id = trim( $id );
 				if ( empty( $id ) ) {
 					unset( $nicknames[ $index ] );
@@ -324,7 +348,7 @@ class WPStrava_Settings {
 	 */
 	public function print_gmaps_key_input() {
 		?>
-		<input type="text" id="strava_gmaps_key" name="strava_gmaps_key" value="<?php echo $this->gmaps_key; ?>" />
+		<input type="text" id="strava_gmaps_key" name="strava_gmaps_key" value="<?php echo esc_attr( $this->gmaps_key ); ?>" />
 		<?php
 	}
 
@@ -632,7 +656,7 @@ class WPStrava_Settings {
 	 * @since  2.0.0
 	 */
 	public function is_option_page() {
-		return isset( $_POST['option_page'] ) && $_POST['option_page'] === $this->option_page;
+		return filter_input( INPUT_POST, 'option_page', FILTER_SANITIZE_STRING ) === $this->option_page;
 	}
 
 	/**
@@ -643,7 +667,7 @@ class WPStrava_Settings {
 	 * @since  2.0.0
 	 */
 	public function is_settings_page() {
-		return isset( $_GET['page'] ) && $_GET['page'] === $this->page_name;
+		return filter_input( INPUT_GET, 'page', FILTER_SANITIZE_STRING ) === $this->page_name;
 	}
 
 	/**
@@ -665,7 +689,7 @@ class WPStrava_Settings {
 	 * @since  2.0.0
 	 */
 	private function is_adding_athlete() {
-		return ! ( empty( $_POST['strava_client_id'] ) && empty( $_POST['strava_client_secret'] ) );
+		return filter_input( INPUT_POST, 'strava_client_id', FILTER_SANITIZE_NUMBER_INT ) && filter_input( INPUT_POST, 'strava_client_secret', FILTER_SANITIZE_STRING );
 	}
 
 	/**
@@ -722,11 +746,13 @@ class WPStrava_Settings {
 	public function ms_plugin_update_message( $file, $plugin ) {
 		if ( is_multisite() && ! is_network_admin() && version_compare( $plugin['Version'], $plugin['new_version'], '<' ) ) {
 			$wp_list_table = _get_list_table( 'WP_Plugins_List_Table' );
-			printf(
-				'<tr class="plugin-update-tr"><td colspan="%s" class="plugin-update update-message notice inline notice-warning notice-alt"><div class="update-message"><h4 style="margin: 0; font-size: 14px;">%s</h4>%s</div></td></tr>',
-				$wp_list_table->get_column_count(),
-				$plugin['Name'],
-				wp_kses_post( $plugin['upgrade_notice'] )
+			echo wp_kses_post(
+				sprintf(
+					'<tr class="plugin-update-tr"><td colspan="%s" class="plugin-update update-message notice inline notice-warning notice-alt"><div class="update-message"><h4 style="margin: 0; font-size: 14px;">%s</h4>%s</div></td></tr>',
+					$wp_list_table->get_column_count(),
+					$plugin['Name'],
+					$plugin['upgrade_notice']
+				)
 			);
 		}
 	}
diff --git a/wp-strava.php b/wp-strava.php
index f955b3f..04d721e 100755
--- a/wp-strava.php
+++ b/wp-strava.php
@@ -3,7 +3,7 @@
  * Plugin Name: WP Strava
  * Plugin URI: https://wordpress.org/plugins/wp-strava/
  * Description: Show your strava.com activity on your WordPress site. Some Icons are Copyright © Yusuke Kamiyamane. All rights reserved. Licensed under a Creative Commons Attribution 3.0 license.
- * Version: 2.0.0
+ * Version: 2.0.1
  * Author: Carlos Santa Cruz, Justin Foell, Lance Willett, Daniel Lintott, Sebastian Erb
  * License: GPL2
  * Text Domain: wp-strava
@@ -28,6 +28,7 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
 
 
+define( 'WPSTRAVA_PLUGIN_VERSION', '2.0.1' );
 define( 'WPSTRAVA_PLUGIN_DIR', trailingslashit( dirname( __FILE__ ) ) );
 define( 'WPSTRAVA_PLUGIN_URL', plugins_url( '/', __FILE__ ) );
 define( 'WPSTRAVA_PLUGIN_NAME', plugin_basename( __FILE__ ) );