diff --git a/oidc/class/oidcflow.class.php b/oidc/class/oidcflow.class.php
index 6c4927e..2091299 100644
--- a/oidc/class/oidcflow.class.php
+++ b/oidc/class/oidcflow.class.php
@@ -497,6 +497,7 @@ private static function _resolveUser($provider, array $claims)
                     _('The FOG account for this identity no longer exists')
                 );
             }
+            self::_refreshProfile($provider, $claims, $user);
             return $user;
         }
 
@@ -530,8 +531,75 @@ private static function _resolveUser($provider, array $claims)
             ->set('userId', $namedId)
             ->save();
 
+        self::_refreshProfile($provider, $claims, $byName);
+
         return $byName;
     }
+    /**
+     * Brings the FOG row back in line with the provider, on every sign-in.
+     *
+     * The display name used to be written once, by _provisionUser(), and
+     * never again: renaming somebody in the directory left FOG showing the
+     * name they had on the day they first signed in, forever, with nothing
+     * an admin could do about it short of editing the row by hand. That is
+     * not what a directory-backed account means -- the provider is supposed
+     * to be the source of truth for who this is, and a value copied once is
+     * a value that starts drifting immediately.
+     *
+     * The LDAP plugin already does this (ldappluginhook.hook.php sets name,
+     * display, api and authsource on every login, new row or not), so this
+     * is the OIDC plugin catching up to the behaviour beside it rather than
+     * a new idea.
+     *
+     * Deliberately NOT refreshed here:
+     *
+     * - uName. The username is what oidcIdentity is keyed against for
+     *   accounts that predate their link, and renaming a FOG account out
+     *   from under its history, tasks and audit rows is a migration, not a
+     *   login side effect. A provider-side rename keeps working because the
+     *   binding is the subject, not the name.
+     * - uAuthSource. Stamping it here would take local password login away
+     *   from an account an admin created, which is the opposite of
+     *   break-glass. _provisionUser() stamps rows this plugin made; those
+     *   are the only ones that get it.
+     *
+     * uAllowAPI IS re-asserted, and that is a real behaviour choice: the
+     * provider's setting wins over a FOG-side edit at the next sign-in. It
+     * matches LDAP, and it means "can these accounts use the API" is
+     * answered in one place instead of drifting per user.
+     *
+     * Saves only when something actually changed, so an unchanged sign-in
+     * costs no write and leaves no history row.
+     *
+     * @param OIDC  $provider the provider
+     * @param array $claims   the verified claims
+     * @param User  $user     the account being signed in
+     *
+     * @return void
+     */
+    private static function _refreshProfile($provider, array $claims, $user)
+    {
+        $display = trim((string)($claims['name'] ?? ''));
+        if ('' === $display) {
+            // No name claim at all -- Google omits it on some scopes. Leave
+            // whatever is there rather than blanking a good value.
+            $display = (string)$user->get('display');
+        }
+        $api = (string)$provider->get('allowapi');
+
+        $changed = false;
+        if ($display !== (string)$user->get('display')) {
+            $user->set('display', $display);
+            $changed = true;
+        }
+        if ($api !== (string)$user->get('api')) {
+            $user->set('api', $api);
+            $changed = true;
+        }
+        if ($changed) {
+            $user->save();
+        }
+    }
     /**
      * Creates the FOG account for an identity that has none.
      *
diff --git a/tests/oidc-profile-refresh.test.php b/tests/oidc-profile-refresh.test.php
new file mode 100644
index 0000000..b985c85
--- /dev/null
+++ b/tests/oidc-profile-refresh.test.php
@@ -0,0 +1,166 @@
+<?php
+/**
+ * Guards "the provider is the source of truth, on every sign-in".
+ *
+ *   tests/oidc-profile-refresh.test.php
+ *
+ * The display name used to be written once, by _provisionUser(), and never
+ * again. Renaming somebody in the directory left FOG showing the name they
+ * had on the day they first signed in, forever. Reported against the lab
+ * Keycloak: first/last name corrected there, FOG kept rendering the old
+ * value on every subsequent login.
+ *
+ * What this pins, and why each one is a way it silently regresses:
+ *
+ *   1. _refreshProfile() exists and is called from BOTH existing-account
+ *      paths. Calling it from one is the shape of the original bug -- an
+ *      account linked by subject refreshes, one linked by name does not, and
+ *      which you are is invisible from the UI.
+ *   2. It does NOT write uName or uAuthSource. Refreshing the username would
+ *      rename an account out from under its history and tasks; stamping
+ *      authsource would take local password login away from an account an
+ *      admin created, which is the opposite of break-glass.
+ *   3. An empty name claim does not blank a good value. Some providers omit
+ *      it depending on scopes.
+ *
+ * Source assertions only -- no DB, no provider, no session.
+ *
+ * Exit 0 = pass, 1 = fail.
+ */
+$flow = dirname(__DIR__) . '/oidc/class/oidcflow.class.php';
+if (!is_readable($flow)) {
+    echo "cannot read $flow -- run this from the repository\n";
+    exit(1);
+}
+
+$pass = 0;
+$fail = 0;
+function ok($m)
+{
+    global $pass;
+    ++$pass;
+    echo "  ok    $m\n";
+}
+function bad($m)
+{
+    global $fail;
+    ++$fail;
+    echo "  FAIL  $m\n";
+}
+
+/**
+ * Source with comments stripped.
+ *
+ * This file's own docblocks name uName, uAuthSource and _refreshProfile, so
+ * every assertion below would pass on the documentation alone.
+ *
+ * @param string $file the file
+ *
+ * @return string
+ */
+function src($file)
+{
+    $out = '';
+    foreach (token_get_all(file_get_contents($file)) as $t) {
+        if (is_array($t)) {
+            if (in_array($t[0], [T_COMMENT, T_DOC_COMMENT], true)) {
+                continue;
+            }
+            $out .= $t[1];
+            continue;
+        }
+        $out .= $t;
+    }
+    return $out;
+}
+
+$s = src($flow);
+$squashed = preg_replace('/\s+/', '', $s);
+
+echo "1. the refresh exists and both existing-account paths use it\n";
+
+if (false !== strpos($squashed, 'privatestaticfunction_refreshProfile(')) {
+    ok('_refreshProfile() is defined');
+} else {
+    bad('_refreshProfile() is gone -- the display name is written once and never again');
+}
+
+// Two calls, not one. The subject-linked path and the link-on-first-sign-in
+// path are different branches of _resolveUser() and both reach an existing
+// FOG row.
+$calls = preg_match_all('/self::_refreshProfile\(/', $s);
+if ($calls >= 2) {
+    ok("_refreshProfile() is called from $calls sites (both existing-account paths)");
+} else {
+    bad("_refreshProfile() is called from $calls site(s); both existing-account paths must refresh");
+}
+
+/*
+ * Scope the write assertions to this method's body and nothing else.
+ *
+ * A fixed-length window is not good enough: the very next method is
+ * _provisionUser(), which legitimately writes name and authsource, so a
+ * window that overruns reports those as violations here. Cut at the start of
+ * the following method instead.
+ */
+$at = strpos($squashed, 'privatestaticfunction_refreshProfile(');
+$bodySquashed = '';
+if (false !== $at) {
+    $next = strpos($squashed, 'staticfunction', $at + 40);
+    $bodySquashed = false === $next
+        ? substr($squashed, $at)
+        : substr($squashed, $at, $next - $at);
+}
+if ('' === $bodySquashed) {
+    bad('could not isolate _refreshProfile()\'s body');
+}
+
+if (false !== strpos($bodySquashed, "set('display'")) {
+    ok('_refreshProfile() writes the display name');
+} else {
+    bad('_refreshProfile() does not write the display name');
+}
+
+echo "\n2. it does not write what must not be rewritten\n";
+
+foreach (
+    [
+        'name' => 'uName -- renaming an account out from under its history is a migration, not a login side effect',
+        'authsource' => 'uAuthSource -- stamping it removes local password login from an admin-created account',
+    ] as $field => $why
+) {
+    if (false === strpos($bodySquashed, "set('" . $field . "'")) {
+        ok("does not write '$field'");
+    } else {
+        bad("writes '$field': $why");
+    }
+}
+
+echo "\n3. a missing claim does not destroy a good value\n";
+
+/*
+ * The guard has to be on emptiness, not on presence: ?? '' yields '' for a
+ * provider that sends "name": "", which is not the same as absent.
+ *
+ * And the FALLBACK VALUE is what actually matters. Asserting only that the
+ * `if` exists passes a version that keeps the branch and assigns '' inside
+ * it -- which is exactly the bug, with the guard still visible in the diff.
+ * Pin the assignment.
+ */
+if (preg_match('/if\s*\(\s*\'\'\s*===\s*\$display\s*\)\s*\{\s*\$display\s*=\s*\(string\)\$user->get\(\s*\'display\'\s*\)/', $s)) {
+    ok('an empty name claim falls back to the value already stored');
+} else {
+    bad('an empty or missing name claim does not fall back to the stored display name');
+}
+
+// Only write when something moved, so an unchanged sign-in leaves no history
+// row. Pinned because the cheap version -- save() unconditionally -- looks
+// identical and writes on every login.
+if (preg_match('/if\s*\(\s*\$changed\s*\)\s*\{\s*\$user->save\(\)/', $s)) {
+    ok('saves only when a value actually changed');
+} else {
+    bad('saves unconditionally -- every sign-in writes a row and a history entry');
+}
+
+printf("\n%d passed, %d failed\n", $pass, $fail);
+exit($fail === 0 ? 0 : 1);