diff --git a/pkgs/development/python-modules/nunavut/default.nix b/pkgs/development/python-modules/nunavut/default.nix
index 8b2943ba363..63b5214b27b 100644
--- a/pkgs/development/python-modules/nunavut/default.nix
+++ b/pkgs/development/python-modules/nunavut/default.nix
@@ -1,13 +1,18 @@
-{ lib, buildPythonPackage, pythonOlder, fetchPypi, pydsdl }:
+{ lib
+, buildPythonPackage
+, pythonOlder
+, fetchPypi
+, pydsdl
+}:
 
  buildPythonPackage rec {
   pname = "nunavut";
-  version = "0.6.2";
+  version = "1.0.1";
   disabled = pythonOlder "3.5"; # only python>=3.5 is supported
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "48b6802722d78542ca5d7bbc0d6aa9b0a31e1be0070c47b41527f227eb6a1443";
+    sha256 = "1gvs3fx2l15y5ffqsxxjfa4p1ydaqbq7qp5nsgb8jbz871358jxm";
   };
 
   propagatedBuildInputs = [
@@ -19,7 +24,10 @@
     export HOME=$TMPDIR
   '';
 
-  # repo doesn't contain tests, ensure imports aren't broken
+  # No tests in pypy package and no git tags yet for release versions, see
+  # https://github.com/UAVCAN/nunavut/issues/182
+  doCheck = false;
+
   pythonImportsCheck = [
     "nunavut"
   ];
diff --git a/pkgs/development/python-modules/pydsdl/default.nix b/pkgs/development/python-modules/pydsdl/default.nix
index 655adecd5c8..08029d35df5 100644
--- a/pkgs/development/python-modules/pydsdl/default.nix
+++ b/pkgs/development/python-modules/pydsdl/default.nix
@@ -2,25 +2,24 @@
 
  buildPythonPackage rec {
   pname = "pydsdl";
-  version = "1.4.2";
+  version = "1.9.4";
   disabled = pythonOlder "3.5"; # only python>=3.5 is supported
 
   src = fetchFromGitHub {
     owner = "UAVCAN";
     repo = pname;
     rev = version;
-    sha256 = "03kbpzdrjzj5vpgz5rhc110pm1axdn3ynv88b42zq6iyab4k8k1x";
+    sha256 = "1hmmc4sg6dckbx2ghcjpi74yprapa6lkxxzy0h446mvyngp0kwfv";
   };
 
-  propagatedBuildInputs = [
-  ];
-
   # allow for writable directory for darwin
   preBuild = ''
     export HOME=$TMPDIR
   '';
 
-  # repo doesn't contain tests, ensure imports aren't broken
+  # repo doesn't contain tests
+  doCheck = false;
+
   pythonImportsCheck = [
     "pydsdl"
   ];