diff --git a/api/v1/clients/update.php b/api/v1/clients/update.php
new file mode 100644
index 00000000..13ec877e
--- /dev/null
+++ b/api/v1/clients/update.php
@@ -0,0 +1,53 @@
+<?php
+
+require_once '../validate_api_key.php';
+require_once '../require_post_method.php';
+
+// Parse Info
+$client_id = intval($_POST['client_id']);
+
+// Default
+$update_count = false;
+
+if (!empty($client_id)) {
+
+    // Fetch current client data
+    $client_row = mysqli_fetch_assoc(mysqli_query($mysqli, "
+        SELECT * FROM clients
+        WHERE client_id = $client_id
+        LIMIT 1
+    "));
+
+    // Assign variables from POST or fallback to DB
+    require_once 'client_model.php';
+
+    // Update client
+    $update_sql = mysqli_query($mysqli, "
+        UPDATE clients SET
+            client_name = '$name',
+            client_type = '$type',
+            client_website = '$website',
+            client_referral = '$referral',
+            client_rate = $rate,
+            client_currency_code = '$currency_code',
+            client_net_terms = $net_terms,
+            client_abbreviation = '$abbreviation',
+            client_tax_id_number = '$tax_id_number',
+            client_lead = $lead,
+            client_notes = '$notes'
+        WHERE client_id = $client_id
+        LIMIT 1
+    ");
+
+    // Check update & get affected rows
+    if ($update_sql) {
+        $update_count = mysqli_affected_rows($mysqli);
+
+        // Logging
+        logAction("Client", "Edit", "$name via API ($api_key_name)", $client_id);
+        logAction("API", "Success", "Edited client $name via API ($api_key_name)", $client_id);
+    }
+}
+
+// Output
+require_once '../update_output.php';