diff --git a/resources/celerity/map.php b/resources/celerity/map.php
--- a/resources/celerity/map.php
+++ b/resources/celerity/map.php
@@ -111,7 +111,7 @@
     'rsrc/css/core/z-index.css' => '40eb7003',
     'rsrc/css/diviner/diviner-shared.css' => '38813222',
     'rsrc/css/font/font-awesome.css' => '21b0ced7',
-    'rsrc/css/font/font-source-sans-pro.css' => '91d53463',
+    'rsrc/css/font/font-source-sans-pro.css' => 'ffe5dda9',
     'rsrc/css/font/phui-font-icon-base.css' => '3dad2ae3',
     'rsrc/css/layout/phabricator-filetree-view.css' => 'fccf9f82',
     'rsrc/css/layout/phabricator-hovercard-view.css' => '893f4783',
@@ -526,7 +526,7 @@
     'diffusion-source-css' => '66fdf661',
     'diviner-shared-css' => '38813222',
     'font-fontawesome' => '21b0ced7',
-    'font-source-sans-pro' => '91d53463',
+    'font-source-sans-pro' => 'ffe5dda9',
     'global-drag-and-drop-css' => '697324ad',
     'harbormaster-css' => '49d64eb4',
     'herald-css' => '826075fa',
diff --git a/webroot/rsrc/css/font/font-source-sans-pro.css b/webroot/rsrc/css/font/font-source-sans-pro.css
--- a/webroot/rsrc/css/font/font-source-sans-pro.css
+++ b/webroot/rsrc/css/font/font-source-sans-pro.css
@@ -8,8 +8,8 @@
   font-weight: 400;
   src: local('Source Sans Pro'),
        local('SourceSansPro-Regular'),
-       url(/rsrc/externals/font/sourcesans/SourceSansPro.woff)
-       format('woff');
+       url(/rsrc/externals/font/sourcesans/SourceSansPro-Regular.woff2) format('woff2'),
+       url(/rsrc/externals/font/sourcesans/SourceSansPro.woff) format('woff');
 }
 
 @font-face {
@@ -18,6 +18,6 @@
   font-weight: 700;
   src: local('Source Sans Pro Bold'),
        local('SourceSansPro-Bold'),
-       url(/rsrc/externals/font/sourcesans/SourceSansProBold.woff)
-       format('woff');
+       url(/rsrc/externals/font/sourcesans/SourceSansPro-Bold.woff2) format('woff2'),
+       url(/rsrc/externals/font/sourcesans/SourceSansProBold.woff) format('woff');
 }
diff --git a/webroot/rsrc/externals/font/sourcesans/SourceSansPro-Bold.woff2 b/webroot/rsrc/externals/font/sourcesans/SourceSansPro-Bold.woff2
new file mode 100644
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000
GIT binary patch
literal 0
Hc$@<O00001

literal 0
Hc$@<O00001

diff --git a/webroot/rsrc/externals/font/sourcesans/SourceSansPro-Regular.woff2 b/webroot/rsrc/externals/font/sourcesans/SourceSansPro-Regular.woff2
new file mode 100644
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000
GIT binary patch
literal 0
Hc$@<O00001

literal 0
Hc$@<O00001