diff --git a/app/Jobs/WikiEntityImportJob.php b/app/Jobs/WikiEntityImportJob.php
index 6b0af4736..932a6f17b 100644
--- a/app/Jobs/WikiEntityImportJob.php
+++ b/app/Jobs/WikiEntityImportJob.php
@@ -2,6 +2,7 @@
 
 namespace App\Jobs;
 
+use App\Services\MediaWikiHostResolver;
 use App\Wiki;
 use App\WikiEntityImport;
 use App\WikiEntityImportStatus;
@@ -20,6 +21,8 @@
 class WikiEntityImportJob implements ShouldQueue {
     use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;
 
+    private MediaWikiHostResolver $mwHostResolver;
+
     /**
      * Create a new job instance.
      */
@@ -28,7 +31,10 @@ public function __construct(
         public string $sourceWikiUrl,
         public array $entityIds,
         public int $importId,
-    ) {}
+        MediaWikiHostResolver $mwHostResolver = null,
+    ) {
+        $this->mwHostResolver = $mwHostResolver ?? new MediaWikiHostResolver();
+    }
 
     private string $targetWikiUrl;
 
@@ -77,9 +83,9 @@ private static function domainToOrigin(string $domain): string {
             : 'https://' . $domain;
     }
 
-    private static function acquireCredentials(string $wikiDomain): OAuthCredentials {
+    private function acquireCredentials(string $wikiDomain): OAuthCredentials {
         $response = Http::withHeaders(['host' => $wikiDomain])->asForm()->post(
-            getenv('PLATFORM_MW_BACKEND_HOST') . '/w/api.php?action=wbstackPlatformOauthGet&format=json',
+            $this->mwHostResolver->getBackendHostForDomain($wikiDomain) . '/w/api.php?action=wbstackPlatformOauthGet&format=json',
             [
                 'consumerName' => 'WikiEntityImportJob',
                 'ownerOnly' => '1',
diff --git a/app/Services/MediaWikiHostResolver.php b/app/Services/MediaWikiHostResolver.php
new file mode 100644
index 000000000..54d5072ad
--- /dev/null
+++ b/app/Services/MediaWikiHostResolver.php
@@ -0,0 +1,37 @@
+<?php
+
+namespace App\Services;
+
+use App\Wiki;
+
+class MediaWikiHostResolver
+{
+    // TODO: Move this mapping to a config file that doesn't require updating this code when doing a MW update?
+    /** @var array<string, string> Map of DB version strings to MediaWiki backend version strings */
+    private const DB_VERSION_TO_MW_VERSION = [
+        'mw1.39-wbs1' => '139-app',
+        'mw1.43-wbs1' => '143-app'
+    ];
+
+    // This service could have other methods in future, e.g. getBackendHostForWiki()
+    // public function getBackendHostForWiki(Wiki $wiki): string {
+    //     return $this->getBackendHostForDomain($wiki->domain);
+    // }
+
+    public function getBackendHostForDomain(string $domain): string
+    {
+        // TODO: should 'backend.default.svc.cluster.local' be an env var e.g. PLATFORM_MW_BACKEND_HOST_SUFFIX?
+        return sprintf('mediawiki-%s-backend.default.svc.cluster.local', $this->getMwVersionForDomain($domain));
+    }
+
+    public function getMwVersionForDomain(string $domain): string
+    {
+        $dbVersion = Wiki::where('domain', $domain)
+            ->whereNull('deleted_at')
+            ->leftJoin('wiki_dbs', 'wiki_id', '=', 'wikis.id')
+            ->pluck('version')
+            ->first();
+
+        return self::DB_VERSION_TO_MW_VERSION[$dbVersion];
+    }
+}