diff --git a/pkgs/servers/matrix-synapse/default.nix b/pkgs/servers/matrix-synapse/default.nix
index 8ac43f018113..8b119994ad9b 100644
--- a/pkgs/servers/matrix-synapse/default.nix
+++ b/pkgs/servers/matrix-synapse/default.nix
@@ -9,11 +9,11 @@ let
 in
 buildPythonApplication rec {
   pname = "matrix-synapse";
-  version = "1.20.1";
+  version = "1.21.0";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "1sf36vwvy2f9jy6dldq6gqfmh60384i5j64s7yc131b4dp0n7lcw";
+    sha256 = "0iip311xbzc984gzpmri5fabpb3b2ck1ywv5378pk90m02yybgi5";
   };
 
   patches = [
@@ -35,13 +35,7 @@ buildPythonApplication rec {
     netaddr
     phonenumbers
     pillow
-    (prometheus_client.overrideAttrs (x: {
-      src = fetchPypi {
-        pname = "prometheus_client";
-        version = "0.3.1";
-        sha256 = "093yhvz7lxl7irnmsfdnf2030lkj4gsfkg6pcmy4yr1ijk029g0p";
-      };
-    }))
+    prometheus_client
     psutil
     psycopg2
     pyasn1