diff --git a/app/Helper/WikiDbVersionHelper.php b/app/Helper/WikiDbVersionHelper.php
new file mode 100644
index 000000000..c1026f594
--- /dev/null
+++ b/app/Helper/WikiDbVersionHelper.php
@@ -0,0 +1,45 @@
+<?php
+
+/* The purpose of this class to have one only place where
+ * this map of mediawikiVersion -> dbVersion lives.
+ */
+
+namespace App\Helper;
+
+/**
+ * Exception thrown when a database version is not mapped in WikiDbVersionHelper.
+ */
+class UnknownDbVersionException extends \Exception {}
+
+class WikiDbVersionHelper {
+    /** @var array<string, string> Map of DB version strings to MediaWiki version strings */
+    private const DB_VERSION_TO_MW_VERSION = [
+        'mw1.39-wbs1' => '139',
+        'mw1.43-wbs1' => '143',
+    ];
+
+    public static function isValidDbVersion(string $dbVersionString): bool {
+        return array_key_exists(
+            $dbVersionString,
+            self::DB_VERSION_TO_MW_VERSION
+        );
+    }
+
+    public static function isValidMwVersion(string $mwVersionString): bool {
+        return array_key_exists(
+            $mwVersionString,
+            array_flip(self::DB_VERSION_TO_MW_VERSION)
+        );
+    }
+
+    /**
+     * @throws UnknownDbVersionException
+     */
+    public static function getMwVersion(string $dbVersionString): string {
+        if (self::isValidDbVersion($dbVersionString)) {
+            return self::DB_VERSION_TO_MW_VERSION[$dbVersionString];
+        }
+
+        throw new UnknownDbVersionException("Unknown database version string: '{$dbVersionString}'");
+    }
+}
diff --git a/app/Http/Controllers/Backend/WikiController.php b/app/Http/Controllers/Backend/WikiController.php
index 8fccf7781..440d441e6 100644
--- a/app/Http/Controllers/Backend/WikiController.php
+++ b/app/Http/Controllers/Backend/WikiController.php
@@ -2,27 +2,24 @@
 
 namespace App\Http\Controllers\Backend;
 
+use App\Helper\WikiDbVersionHelper;
 use App\Http\Controllers\Controller;
 use App\Wiki;
 use Illuminate\Http\Request;
 
 class WikiController extends Controller {
-    private static $with = ['wikiDb', 'wikiQueryserviceNamespace', 'settings'];
-
     public function getWikiForDomain(Request $request): \Illuminate\Http\JsonResponse {
-        $domain = $request->input('domain');
+        $validated = $request->validate([
+            'domain' => 'required|string',
+        ]);
+
+        $domain = $validated['domain'];
 
         // XXX: this same logic is in quickstatements.php and platform api WikiController backend
         try {
-            if ($domain === 'localhost' || $domain === 'mediawiki') {
-                // If just using localhost then just get the first undeleted wiki
-                $result = Wiki::with(self::$with)->first();
-            } else {
-                // TODO don't select the timestamps and redundant info for the settings?
-                $result = Wiki::where('domain', $domain)->with(self::$with)->first();
-            }
-        } catch (\Exception $ex) {
-            return response()->json($ex->getMessage(), 500);
+            $result = Wiki::with(['wikiDb', 'wikiQueryserviceNamespace', 'settings'])->firstWhere('domain', $domain);
+        } catch (\Exception $e) {
+            return response()->json($e->getMessage(), 500);
         }
 
         if (!$result) {
@@ -31,4 +28,33 @@ public function getWikiForDomain(Request $request): \Illuminate\Http\JsonRespons
 
         return response()->json(['data' => $result], 200);
     }
+
+    public function setWikiDbVersionForDomain(Request $request): \Illuminate\Http\JsonResponse {
+        $validated = $request->validate([
+            'domain' => 'required|string',
+            'dbVersion' => 'required|string',
+        ]);
+
+        $domain = $validated['domain'];
+        $targetDbVersion = $validated['dbVersion'];
+
+        try {
+            $wiki = Wiki::with('wikiDb')->firstWhere('domain', $domain);
+
+            if (!$wiki) {
+                return response()->json(['error' => "No wiki found with domain: '{$domain}'"], 404);
+            }
+
+            if (!WikiDbVersionHelper::isValidDbVersion($targetDbVersion)) {
+                return response()->json(['error' => "Invalid database version string: '{$targetDbVersion}'"], 400);
+            }
+
+            $wiki->wikiDb->version = $targetDbVersion;
+            $wiki->wikiDb->save();
+        } catch (\Exception $e) {
+            return response()->json($e->getMessage(), 500);
+        }
+
+        return response()->json(['result' => 'success'], 200);
+    }
 }
diff --git a/app/Services/MediaWikiHostResolver.php b/app/Services/MediaWikiHostResolver.php
index a07e6f9a4..21fc8884b 100644
--- a/app/Services/MediaWikiHostResolver.php
+++ b/app/Services/MediaWikiHostResolver.php
@@ -2,6 +2,7 @@
 
 namespace App\Services;
 
+use App\Helper\WikiDbVersionHelper;
 use App\Wiki;
 use Exception;
 
@@ -16,17 +17,6 @@ class UnknownDBVersionException extends Exception {}
 class UnknownWikiDomainException extends Exception {}
 
 class MediaWikiHostResolver {
-    // TODO: Move this mapping to a config file so that MW updates do not require code changes here.
-    /** @var array<string, string> Map of DB version strings to MediaWiki version strings */
-    private const DB_VERSION_TO_MW_VERSION = [
-        'mw1.39-wbs1' => '139',
-        'mw1.43-wbs1' => '143',
-    ];
-
-    /**
-     * @throws UnknownDBVersionException
-     * @throws UnknownWikiDomainException
-     */
     public function getHostsForDomain(string $domain): array {
         $mwVersionForDomain = $this->getMwVersionForDomain($domain);
 
@@ -44,6 +34,10 @@ public function getBackendHostForDomain(string $domain): string {
         return sprintf('mediawiki-%s-app-backend.default.svc.cluster.local', $this->getMwVersionForDomain($domain));
     }
 
+    /**
+     * @throws UnknownDBVersionException
+     * @throws UnknownWikiDomainException
+     */
     private function getMwVersionForDomain(string $domain): string {
         $wiki = Wiki::where('domain', $domain)->first();
 
@@ -53,8 +47,8 @@ private function getMwVersionForDomain(string $domain): string {
 
         $dbVersion = $wiki->wikiDb->version;
 
-        if (array_key_exists($dbVersion, self::DB_VERSION_TO_MW_VERSION)) {
-            return self::DB_VERSION_TO_MW_VERSION[$dbVersion];
+        if (WikiDbVersionHelper::isValidDbVersion($dbVersion)) {
+            return WikiDbVersionHelper::getMwVersion($dbVersion);
         }
         throw new UnknownDBVersionException("Unknown DB version '{$dbVersion}' for domain '{$domain}'.");
     }
diff --git a/routes/backend.php b/routes/backend.php
index 478a40367..795e475a0 100644
--- a/routes/backend.php
+++ b/routes/backend.php
@@ -19,6 +19,8 @@
 $router->group(['prefix' => 'wiki'], function () use ($router) {
     // GET
     $router->get('getWikiForDomain', ['uses' => 'WikiController@getWikiForDomain']);
+    // POST
+    $router->post('setDbVersion', ['uses' => 'WikiController@setWikiDbVersionForDomain']);
     // PATCH
     $router->patch('updateEntityImport', ['uses' => '\App\Http\Controllers\WikiEntityImportController@update']);
 });
diff --git a/tests/Helper/WikiDbVersionHelperTest.php b/tests/Helper/WikiDbVersionHelperTest.php
new file mode 100644
index 000000000..c3e9402c9
--- /dev/null
+++ b/tests/Helper/WikiDbVersionHelperTest.php
@@ -0,0 +1,22 @@
+<?php
+
+namespace Tests\Jobs;
+
+use App\Helper\UnknownDbVersionException;
+use App\Helper\WikiDbVersionHelper;
+use Tests\TestCase;
+
+class WikiDbVersionHelperTest extends TestCase {
+    public function testUnknownDbVersion() {
+        $this->expectException(UnknownDbVersionException::class);
+
+        WikiDbVersionHelper::getMwVersion('invalidDbVersion');
+    }
+
+    public function testKnownMwVersion() {
+        $this->assertSame(
+            WikiDbVersionHelper::getMwVersion('mw1.39-wbs1'),
+            '139'
+        );
+    }
+}
diff --git a/tests/Routes/Backend/WikiControllerTest.php b/tests/Routes/Backend/WikiControllerTest.php
new file mode 100644
index 000000000..a1529e0c3
--- /dev/null
+++ b/tests/Routes/Backend/WikiControllerTest.php
@@ -0,0 +1,92 @@
+<?php
+
+namespace Tests\Routes\Backend;
+
+use App\Wiki;
+use App\WikiDb;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class WikiControllerTest extends TestCase {
+    use RefreshDatabase;
+
+    const VALID_WIKI_DB_VERSION_STRING_139 = 'mw1.39-wbs1';
+
+    const VALID_WIKI_DB_VERSION_STRING_143 = 'mw1.43-wbs1';
+
+    protected $routeSetDbVersion = '/backend/wiki/setDbVersion';
+
+    protected $routeGetWikiForDomain = '/backend/wiki/getWikiForDomain';
+
+    private function createWiki(string $domain, string $version) {
+        $wiki = Wiki::factory()->create(['domain' => $domain]);
+        WikiDb::create([
+            'name' => $domain,
+            'user' => 'someUser',
+            'password' => 'somePassword',
+            'version' => $version,
+            'prefix' => 'somePrefix',
+            'wiki_id' => $wiki->id,
+        ]);
+    }
+
+    public function testSetWikiDbVersionForDomainSuccess() {
+        $targetDbVersion = self::VALID_WIKI_DB_VERSION_STRING_143;
+        $wikiDomain = 'coffeebase.wikibase.cloud';
+
+        $this->createWiki($wikiDomain, self::VALID_WIKI_DB_VERSION_STRING_139);
+
+        $this->postJson("{$this->routeSetDbVersion}?domain={$wikiDomain}&dbVersion={$targetDbVersion}")
+            ->assertStatus(200)
+            ->assertJson([
+                'result' => 'success',
+            ]);
+    }
+
+    public function testSetWikiDbVersionForDomainWikiNotfound() {
+        $targetDbVersion = self::VALID_WIKI_DB_VERSION_STRING_143;
+        $wikiDomain = 'notFound.wikibase.cloud';
+
+        $this->postJson("{$this->routeSetDbVersion}?domain={$wikiDomain}&dbVersion={$targetDbVersion}")
+            ->assertStatus(404);
+    }
+
+    public function testSetWikiDbVersionForDomainUnknownDbVersion() {
+        $targetDbVersion = 'unknownVersion';
+        $wikiDomain = 'coffeebase.wikibase.cloud';
+
+        $this->createWiki($wikiDomain, self::VALID_WIKI_DB_VERSION_STRING_139);
+
+        $this->postJson("{$this->routeSetDbVersion}?domain={$wikiDomain}&dbVersion={$targetDbVersion}")
+            ->assertStatus(400);
+    }
+
+    public function testSetWikiDbVersionForDomainMissingDbVersion() {
+        $wikiDomain = 'coffeebase.wikibase.cloud';
+
+        $this->createWiki($wikiDomain, self::VALID_WIKI_DB_VERSION_STRING_139);
+
+        $this->postJson("{$this->routeSetDbVersion}?domain={$wikiDomain}")
+            ->assertStatus(422);
+    }
+
+    public function testSetWikiDbVersionForDomainMissingWikiDomain() {
+        $targetDbVersion = self::VALID_WIKI_DB_VERSION_STRING_143;
+        $wikiDomain = 'coffeebase.wikibase.cloud';
+
+        $this->createWiki($wikiDomain, self::VALID_WIKI_DB_VERSION_STRING_139);
+
+        $this->postJson("{$this->routeSetDbVersion}?dbVersion={$targetDbVersion}")
+            ->assertStatus(422);
+    }
+
+    public function testGetWikiForDomainMissingWikiDomain() {
+        $this->getJson("{$this->routeGetWikiForDomain}")
+            ->assertStatus(422);
+    }
+
+    public function testGetWikiForDomainWikiNotFound() {
+        $this->getJson("{$this->routeGetWikiForDomain}?domain=somewiki")
+            ->assertStatus(404);
+    }
+}