diff --git a/pkgs/development/python-modules/slowapi/default.nix b/pkgs/development/python-modules/slowapi/default.nix
new file mode 100644
index 000000000000..921a191d5fa1
--- /dev/null
+++ b/pkgs/development/python-modules/slowapi/default.nix
@@ -0,0 +1,63 @@
+{ lib
+, buildPythonPackage
+, fastapi
+, fetchFromGitHub
+, fetchpatch
+, limits
+, mock
+, hiro
+, poetry-core
+, pytestCheckHook
+, pythonOlder
+, redis
+, starlette
+}:
+
+buildPythonPackage rec {
+  pname = "slowapi";
+  version = "0.1.4";
+  format = "pyproject";
+  disabled = pythonOlder "3.6";
+
+  src = fetchFromGitHub {
+    owner = "laurentS";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "0bnnzgv2wy145sdab54hljwv1b5029ndrr0y9rc2q0mraz8lf8lm";
+  };
+
+  nativeBuildInputs = [
+    poetry-core
+  ];
+
+  propagatedBuildInputs = [
+    limits
+    redis
+  ];
+
+  checkInputs = [
+    fastapi
+    hiro
+    mock
+    pytestCheckHook
+    starlette
+  ];
+
+  patches = [
+    # Switch to poetry-core, https://github.com/laurentS/slowapi/pull/54
+    (fetchpatch {
+      name = "switch-to-poetry-core.patch";
+      url = "https://github.com/laurentS/slowapi/commit/fe165f2d479f4f8e4b7dd9cd88ec0ae847b490c5.patch";
+      sha256 = "16vjxdjjiyg8zjrgfyg9q2ym2lmnms2zy5d2cg3ccg51cfl715fi";
+    })
+  ];
+
+  pythonImportsCheck = [ "slowapi" ];
+
+  meta = with lib; {
+    description = "Python library for API rate limiting";
+    homepage = "https://github.com/laurentS/slowapi";
+    license = with licenses; [ mit ];
+    maintainers = with maintainers; [ fab ];
+  };
+}
diff --git a/pkgs/tools/security/theharvester/default.nix b/pkgs/tools/security/theharvester/default.nix
index 2fae6c465d59..dc1596facdff 100644
--- a/pkgs/tools/security/theharvester/default.nix
+++ b/pkgs/tools/security/theharvester/default.nix
@@ -4,8 +4,8 @@
 }:
 
 python3.pkgs.buildPythonApplication rec {
-  pname = "theHarvester";
-  version = "3.2.3";
+  pname = "theharvester";
+  version = "4.0.0";
 
   src = fetchFromGitHub {
     owner = "laramies";
@@ -16,6 +16,7 @@ python3.pkgs.buildPythonApplication rec {
 
   propagatedBuildInputs = with python3.pkgs; [
     aiodns
+    aiofiles
     aiohttp
     aiomultiprocess
     aiosqlite
@@ -23,8 +24,7 @@ python3.pkgs.buildPythonApplication rec {
     censys
     certifi
     dnspython
-    gevent
-    grequests
+    fastapi
     lxml
     netaddr
     plotly
@@ -33,14 +33,23 @@ python3.pkgs.buildPythonApplication rec {
     requests
     retrying
     shodan
-    texttable
+    slowapi
+    starlette
+    uvicorn
     uvloop
   ];
 
-  checkInputs = [ python3.pkgs.pytest ];
+  checkInputs = with  python3.pkgs; [
+    pytest
+    pytest-asyncio
+  ];
 
-  checkPhase = "runHook preCheck ; pytest tests/test_myparser.py ; runHook postCheck";
   # We don't run other tests (discovery modules) because they require network access
+  checkPhase = ''
+    runHook preCheck
+    pytest tests/test_myparser.py
+    runHook postCheck
+  '';
 
   meta = with lib; {
     description = "Gather E-mails, subdomains and names from different public sources";
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index c8d101cc282d..d91d9d044177 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -8008,6 +8008,8 @@ in {
 
   slob = callPackage ../development/python-modules/slob { };
 
+  slowapi = callPackage ../development/python-modules/slowapi { };
+
   sly = callPackage ../development/python-modules/sly { };
 
   smart-meter-texas = callPackage ../development/python-modules/smart-meter-texas { };