diff --git a/pkgs/development/python-modules/opentimestamps/default.nix b/pkgs/development/python-modules/opentimestamps/default.nix
index b34c883d685c..e253c0b5c9bf 100644
--- a/pkgs/development/python-modules/opentimestamps/default.nix
+++ b/pkgs/development/python-modules/opentimestamps/default.nix
@@ -4,14 +4,14 @@
 , fetchFromGitHub
 , git
 , GitPython
-, pysha3
+, pycryptodomex
 , pytestCheckHook
 , pythonOlder
 }:
 
 buildPythonPackage rec {
   pname = "opentimestamps";
-  version = "0.4.2";
+  version = "0.4.3";
   format = "setuptools";
 
   disabled = pythonOlder "3.7";
@@ -20,17 +20,16 @@ buildPythonPackage rec {
     owner = "opentimestamps";
     repo = "python-opentimestamps";
     rev = "python-opentimestamps-v${version}";
-    hash = "sha256-RRCAxDYWySmnG1sEQWurUDQsu+vPx9Npbr6BaoNGm1U=";
+    hash = "sha256-ZTZ7D3NGhO18IxKqTMFBe6pDvqtGR+9w0cgs6VAHtwg=";
   };
 
   propagatedBuildInputs = [
     bitcoinlib
     GitPython
-    pysha3
+    pycryptodomex
   ];
 
   checkInputs = [
-    git
     pytestCheckHook
   ];
 
@@ -48,6 +47,6 @@ buildPythonPackage rec {
     description = "Create and verify OpenTimestamps proofs";
     homepage = "https://github.com/opentimestamps/python-opentimestamps";
     license = licenses.lgpl3Plus;
-    maintainers = with maintainers; [ ];
+    maintainers = with maintainers; [ erikarvstedt ];
   };
 }
diff --git a/pkgs/tools/misc/opentimestamps-client/default.nix b/pkgs/tools/misc/opentimestamps-client/default.nix
index 939e5c8c72fa..6c17cf62a640 100644
--- a/pkgs/tools/misc/opentimestamps-client/default.nix
+++ b/pkgs/tools/misc/opentimestamps-client/default.nix
@@ -18,9 +18,10 @@ buildPythonApplication rec {
 
   propagatedBuildInputs = [ opentimestamps appdirs GitPython pysocks ];
 
-  meta = {
+  meta = with lib; {
     description = "Command-line tool to create and verify OpenTimestamps proofs";
     homepage = "https://github.com/opentimestamps/opentimestamps-client";
-    license = lib.licenses.lgpl3;
+    license = licenses.lgpl3;
+    maintainers = with maintainers; [ erikarvstedt ];
   };
 }