diff --git a/pkgs/servers/mautrix-whatsapp/default.nix b/pkgs/servers/mautrix-whatsapp/default.nix
index 1ee491acebef..f93054b28665 100644
--- a/pkgs/servers/mautrix-whatsapp/default.nix
+++ b/pkgs/servers/mautrix-whatsapp/default.nix
@@ -2,18 +2,30 @@
 
 buildGoModule {
   pname = "mautrix-whatsapp-unstable";
-  version = "2020-05-21";
+  version = "2020-05-27";
 
   src = fetchFromGitHub {
     owner = "tulir";
     repo = "mautrix-whatsapp";
-    rev = "b4949eec5982643502bb9787cf5e2872a78807c1";
-    sha256 = "1hjqxqfza6r7fsxr4fgwhfdwjzligxk416692xi4pavd5krfxxmd";
+    rev = "7cf19b0908dec6cb8239aebc3f79ee88dccbfc51";
+    sha256 = "14cadqvbcjd9vp6dix3jzn0l071r3i9sz0lwpppgzpid8mg9zbx4";
   };
 
   buildInputs = [ olm ];
 
-  vendorSha256 = "0ix65b48cpx6vkqmjizzij7zl8h2kjkfsa0s42vnmjdlmsv7yn42";
+  vendorSha256 = "01psqvxkf13had7gkg1cbzf2flac4a6ivlb7vfzw7s50vhwkb95d";
+
+  overrideModAttrs = _: {
+    postBuild = ''
+      rm -r vendor/github.com/chai2010/webp
+      cp -r --reflink=auto ${fetchFromGitHub {
+        owner = "chai2010";
+        repo = "webp";
+        rev = "3da79ec3d682694d42bfd211db18fc1343c07cd7";
+        sha256 = "0gh3g52vz8na153mjmxkl80g3dvrcjw77xpjs1c02vagpj9jyw46";
+      }} vendor/github.com/chai2010/webp
+    '';
+  };
 
   meta = with stdenv.lib; {
     homepage = "https://github.com/tulir/mautrix-whatsapp";