diff --git a/pkgs/development/python-modules/aetcd/default.nix b/pkgs/development/python-modules/aetcd/default.nix
new file mode 100644
index 000000000000..8a2652450cd1
--- /dev/null
+++ b/pkgs/development/python-modules/aetcd/default.nix
@@ -0,0 +1,67 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, grpcio
+, protobuf
+, pytest-asyncio
+, pytest-mock
+, pytestCheckHook
+, pythonOlder
+, setuptools
+, setuptools-scm
+}:
+
+buildPythonPackage rec {
+  pname = "aetcd";
+  version = "1.0.0a4";
+  pyproject = true;
+
+  disabled = pythonOlder "3.8";
+
+  src = fetchFromGitHub {
+    owner = "martyanov";
+    repo = "aetcd";
+    rev = "refs/tags/v${version}";
+    hash = "sha256-g49ppfh8dyGpZeu/HdTDX8RAk5VTcZmqENRpNY12qkg=";
+  };
+
+  postPatch = ''
+    substituteInPlace setup.py \
+      --replace-fail "setuptools_scm==6.3.2" "setuptools_scm"
+    substituteInPlace setup.cfg \
+      --replace-fail "--cov=aetcd" ""
+  '';
+
+  nativeBuildInputs = [
+    setuptools
+    setuptools-scm
+  ];
+
+  propagatedBuildInputs = [
+    grpcio
+    protobuf
+  ];
+
+  nativeCheckInputs = [
+    pytest-asyncio
+    pytest-mock
+    pytestCheckHook
+  ];
+
+  pythonImportsCheck = [
+    "aetcd"
+  ];
+
+  disabledTestPaths = [
+    # Tests require a running ectd instance
+    "tests/integration/"
+  ];
+
+  meta = with lib; {
+    description = "Python asyncio-based client for etcd";
+    homepage = "https://github.com/martyanov/aetcd";
+    changelog = "https://github.com/martyanov/aetcd/blob/v${version}/docs/changelog.rst";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ fab ];
+  };
+}
diff --git a/pkgs/development/python-modules/limits/default.nix b/pkgs/development/python-modules/limits/default.nix
index f55fd087cad9..e0c1fcf9a14c 100644
--- a/pkgs/development/python-modules/limits/default.nix
+++ b/pkgs/development/python-modules/limits/default.nix
@@ -1,10 +1,13 @@
 { lib
+, aetcd
 , buildPythonPackage
+, coredis
 , deprecated
-, fetchFromGitHub
 , etcd3
+, fetchFromGitHub
 , hiro
 , importlib-resources
+, motor
 , packaging
 , pymemcache
 , pymongo
@@ -20,13 +23,13 @@
 buildPythonPackage rec {
   pname = "limits";
   version = "3.7.0";
-  format = "setuptools";
+  pyproject = true;
 
   disabled = pythonOlder "3.7";
 
   src = fetchFromGitHub {
     owner = "alisaifee";
-    repo = pname;
+    repo = "limits";
     rev = "refs/tags/${version}";
     # Upstream uses versioneer, which relies on git attributes substitution.
     # This leads to non-reproducible archives on github. Remove the substituted
@@ -37,37 +40,66 @@ buildPythonPackage rec {
     hash = "sha256-0h3ofungHkjycUvNJ3jf+VB/GSrshgUDECN2YoPGzzg=";
   };
 
-  propagatedBuildInputs = [
-    deprecated
-    importlib-resources
-    packaging
-    setuptools
-    typing-extensions
-  ];
-
-  nativeCheckInputs = [
-    etcd3
-    hiro
-    pymemcache
-    pymongo
-    pytest-asyncio
-    pytest-lazy-fixture
-    pytestCheckHook
-    redis
-  ];
-
   postPatch = ''
     substituteInPlace pytest.ini \
-      --replace "--cov=limits" "" \
-      --replace "-K" ""
+      --replace-fail "--cov=limits" "" \
+      --replace-fail "-K" ""
 
     substituteInPlace setup.py \
-      --replace "versioneer.get_version()" "'${version}'"
+      --replace-fail "versioneer.get_version()" "'${version}'"
 
     # Recreate _version.py, deleted at fetch time due to non-reproducibility.
     echo 'def get_versions(): return {"version": "${version}"}' > limits/_version.py
   '';
 
+  nativeBuildInputs = [
+    setuptools
+  ];
+
+  propagatedBuildInputs = [
+    deprecated
+    importlib-resources
+    packaging
+    typing-extensions
+  ];
+
+  passthru.optional-dependencies = {
+    redis = [
+      redis
+    ];
+    rediscluster = [
+      redis
+    ];
+    memcached = [
+      pymemcache
+    ];
+    mongodb = [
+      pymongo
+    ];
+    etcd = [
+      etcd3
+    ];
+    async-redis = [
+      coredis
+    ];
+    # async-memcached = [
+    #   emcache  # Missing module
+    # ];
+    async-mongodb = [
+      motor
+    ];
+    async-etcd = [
+      aetcd
+    ];
+  };
+
+  nativeCheckInputs = [
+    hiro
+    pytest-asyncio
+    pytest-lazy-fixture
+    pytestCheckHook
+  ] ++ lib.flatten (builtins.attrValues passthru.optional-dependencies);
+
   pythonImportsCheck = [
     "limits"
   ];
@@ -82,6 +114,7 @@ buildPythonPackage rec {
   meta = with lib; {
     description = "Rate limiting using various strategies and storage backends such as redis & memcached";
     homepage = "https://github.com/alisaifee/limits";
+    changelog = "https://github.com/alisaifee/limits/releases/tag/${version}";
     license = licenses.mit;
     maintainers = with maintainers; [ ];
   };
diff --git a/pkgs/development/python-modules/slowapi/default.nix b/pkgs/development/python-modules/slowapi/default.nix
index 089d4d2743e9..c64a89d896df 100644
--- a/pkgs/development/python-modules/slowapi/default.nix
+++ b/pkgs/development/python-modules/slowapi/default.nix
@@ -10,37 +10,26 @@
 , pytestCheckHook
 , pythonAtLeast
 , pythonOlder
-, pythonRelaxDepsHook
 , redis
 , starlette
 }:
 
 buildPythonPackage rec {
   pname = "slowapi";
-  version = "0.1.8";
-  format = "pyproject";
+  version = "0.1.9";
+  pyproject = true;
 
   disabled = pythonOlder "3.7";
 
   src = fetchFromGitHub {
     owner = "laurentS";
-    repo = pname;
+    repo = "slowapi";
     rev = "refs/tags/v${version}";
-    hash = "sha256-xgHz8b95SXf/GwzKPfQ/RHbUNJfCx6+7a2HB8+6hjsw=";
+    hash = "sha256-R/Mr+Qv22AN7HCDGmAUVh4efU8z4gMIyhC0AuKmxgdE=";
   };
 
-  pythonRelaxDeps = [
-    "limits"
-  ];
-
-  postPatch = ''
-    substituteInPlace pyproject.toml \
-      --replace '["redis^3.4.1"]' '["redis"]'
-  '';
-
   nativeBuildInputs = [
     poetry-core
-    pythonRelaxDepsHook
   ];
 
   propagatedBuildInputs = [
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 9c483e790da8..71d7fc931e7b 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -105,6 +105,8 @@ self: super: with self; {
 
   aesedb = callPackage ../development/python-modules/aesedb { };
 
+  aetcd = callPackage ../development/python-modules/aetcd { };
+
   afdko = callPackage ../development/python-modules/afdko { };
 
   affine = callPackage ../development/python-modules/affine { };