diff --git a/packages/playwright-core/src/utils/registry.ts b/packages/playwright-core/src/utils/registry.ts
index 05253da15e..c7a370491b 100644
--- a/packages/playwright-core/src/utils/registry.ts
+++ b/packages/playwright-core/src/utils/registry.ts
@@ -45,7 +45,7 @@ const EXECUTABLE_PATHS = {
     'ubuntu18.04': ['firefox', 'firefox'],
     'ubuntu20.04': ['firefox', 'firefox'],
     'ubuntu18.04-arm64': undefined,
-    'ubuntu20.04-arm64': undefined,
+    'ubuntu20.04-arm64': ['firefox', 'firefox'],
     'mac10.13': ['firefox', 'Nightly.app', 'Contents', 'MacOS', 'firefox'],
     'mac10.14': ['firefox', 'Nightly.app', 'Contents', 'MacOS', 'firefox'],
     'mac10.15': ['firefox', 'Nightly.app', 'Contents', 'MacOS', 'firefox'],
@@ -108,7 +108,7 @@ const DOWNLOAD_URLS = {
     'ubuntu18.04': '%s/builds/firefox/%s/firefox-ubuntu-18.04.zip',
     'ubuntu20.04': '%s/builds/firefox/%s/firefox-ubuntu-20.04.zip',
     'ubuntu18.04-arm64': undefined,
-    'ubuntu20.04-arm64': undefined,
+    'ubuntu20.04-arm64': '%s/builds/firefox/%s/firefox-ubuntu-20.04-arm64.zip',
     'mac10.13': '%s/builds/firefox/%s/firefox-mac-11.zip',
     'mac10.14': '%s/builds/firefox/%s/firefox-mac-11.zip',
     'mac10.15': '%s/builds/firefox/%s/firefox-mac-11.zip',