diff --git a/pkgs/development/python-modules/canonicaljson/default.nix b/pkgs/development/python-modules/canonicaljson/default.nix
index 0787d4d09718..0dd7a02a4aba 100644
--- a/pkgs/development/python-modules/canonicaljson/default.nix
+++ b/pkgs/development/python-modules/canonicaljson/default.nix
@@ -10,14 +10,14 @@
 
 buildPythonPackage rec {
   pname = "canonicaljson";
-  version = "1.6.5";
+  version = "2.0.0";
   format = "pyproject";
 
   disabled = pythonOlder "3.7";
 
   src = fetchPypi {
     inherit pname version;
-    hash = "sha256-aN/BV7AR4H2Uv3S11MzAGVhYTtlC2d/V/dcGYJ6BzUs=";
+    hash = "sha256-4v2u8df63F2ctZvT0NQbBk3dppeAmsQyXc7XIdEvET8=";
   };
 
   nativeBuildInputs = [
@@ -28,20 +28,10 @@ buildPythonPackage rec {
     simplejson
   ];
 
-  passthru.optional-dependencies = {
-    frozendict = [
-      frozendict
-    ];
-  };
-
   nativeCheckInputs = [
     pytestCheckHook
   ];
 
-  disabledTests = [
-    "test_frozen_dict"
-  ];
-
   pythonImportsCheck = [
     "canonicaljson"
   ];
diff --git a/pkgs/servers/matrix-synapse/default.nix b/pkgs/servers/matrix-synapse/default.nix
index 0061fa71e6b8..17adab07cf11 100644
--- a/pkgs/servers/matrix-synapse/default.nix
+++ b/pkgs/servers/matrix-synapse/default.nix
@@ -12,27 +12,26 @@ in
 with python3.pkgs;
 buildPythonApplication rec {
   pname = "matrix-synapse";
-  version = "1.80.0";
+  version = "1.81.0";
   format = "pyproject";
 
   src = fetchFromGitHub {
     owner = "matrix-org";
     repo = "synapse";
     rev = "v${version}";
-    hash = "sha256-Lw6gmuI+ntOW54HQbmDoY9QYNDTu5vgtrJz6HMWWmMM=";
+    hash = "sha256-zOpjJSzQNgWQy52GjwR1zy3oaMRTxP92T3hNaYhmcCs=";
   };
 
   cargoDeps = rustPlatform.fetchCargoTarball {
     inherit src;
     name = "${pname}-${version}";
-    hash = "sha256-KqPpaIJ8VuVV6f6n14/7wbA+Vtk7NvWm09bUBWuAAlY=";
+    hash = "sha256-s/zq8VGBdIQu/Q/2gJrLFtZJ+lsTyK+2fr9RYhBTbKA=";
   };
 
   postPatch = ''
     # Remove setuptools_rust from runtime dependencies
     # https://github.com/matrix-org/synapse/blob/v1.69.0/pyproject.toml#L177-L185
     sed -i '/^setuptools_rust =/d' pyproject.toml
-    sed -i 's/^frozendict = ">=1,!=2.1.2,<2.3.5"/frozendict = ">=1,!=2.1.2,<2.3.6"/g' pyproject.toml
   '';
 
   nativeBuildInputs = [
@@ -52,8 +51,8 @@ buildPythonApplication rec {
     bleach
     canonicaljson
     daemonize
-    frozendict
     ijson
+    immutabledict
     jinja2
     jsonschema
     lxml