diff --git a/pkgs/development/python-modules/b2sdk/default.nix b/pkgs/development/python-modules/b2sdk/default.nix
index 7dfce0d75c5..f807c035399 100644
--- a/pkgs/development/python-modules/b2sdk/default.nix
+++ b/pkgs/development/python-modules/b2sdk/default.nix
@@ -3,13 +3,13 @@
 
 buildPythonPackage rec {
   pname = "b2sdk";
-  version = "1.1.4";
+  version = "1.2.0";
 
   disabled = isPy27;
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "0g527qdda105r5g9yjh4lxzlmz34m2bdz8dydqqy09igdsmiyi9j";
+    sha256 = "8e46ff9d47a9b90d8b9beab1969fcf4920300b02e20e6bf0745be04e09e8a6ff";
   };
 
   pythonImportsCheck = [ "b2sdk" ];
diff --git a/pkgs/development/python-modules/phx-class-registry/default.nix b/pkgs/development/python-modules/phx-class-registry/default.nix
new file mode 100644
index 00000000000..db0359a1d4f
--- /dev/null
+++ b/pkgs/development/python-modules/phx-class-registry/default.nix
@@ -0,0 +1,28 @@
+{ stdenv, buildPythonPackage, fetchPypi, isPy27, pytestCheckHook }:
+
+buildPythonPackage rec {
+  pname = "phx-class-registry";
+  version = "3.0.5";
+
+  disabled = isPy27;
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "14iap8db2ldmnlf5kvxs52aps31rl98kpa5nq8wdm30a86n6457i";
+  };
+
+  checkInputs = [ pytestCheckHook ];
+
+  disabledTests = [
+    "test_branding"
+    "test_happy_path"
+    "test_len"
+  ];
+
+  meta = with stdenv.lib; {
+    description = "Registry pattern for Python classes, with setuptools entry points integration";
+    homepage = "https://github.com/todofixthis/class-registry";
+    license = licenses.mit;
+    maintainers = with maintainers; [ SuperSandro2000 ];
+  };
+}
diff --git a/pkgs/development/tools/backblaze-b2/default.nix b/pkgs/development/tools/backblaze-b2/default.nix
index 32161a43798..446d54f90ca 100644
--- a/pkgs/development/tools/backblaze-b2/default.nix
+++ b/pkgs/development/tools/backblaze-b2/default.nix
@@ -1,34 +1,29 @@
-{
-  fetchFromGitHub,
-  lib,
-  python3Packages,
-}:
+{ fetchFromGitHub, lib, python3Packages }:
 
 python3Packages.buildPythonApplication rec {
   pname = "backblaze-b2";
-  version = "2.0.2";
+  version = "2.1.0";
 
   src = fetchFromGitHub {
     owner = "Backblaze";
     repo = "B2_Command_Line_Tool";
     rev = "v${version}";
-    sha256 = "00zs0a580vvfm2w4ja68mc46360p475wlgagjkq1hi4m8s4qwd75";
+    sha256 = "1kkpvxqgh5pw4kr8lh5gy9d7960hv9zvajbjiqhj6xgykwbpbgmq";
   };
 
   propagatedBuildInputs = with python3Packages; [
     b2sdk
     class-registry
+    phx-class-registry
     setuptools
   ];
 
-  checkInputs = with python3Packages; [
-    nose
-  ];
+  checkInputs = with python3Packages; [ pytestCheckHook ];
 
-  # doCheck = false;
-  checkPhase = ''
-    nosetests
-  '';
+  disabledTests = [
+    "test_files_headers"
+    "test_integration"
+  ];
 
   postInstall = ''
     mv "$out/bin/b2" "$out/bin/backblaze-b2"
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index be068a6c507..30c845e2efb 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -4548,6 +4548,8 @@ in {
 
   phpserialize = callPackage ../development/python-modules/phpserialize { };
 
+  phx-class-registry = callPackage ../development/python-modules/phx-class-registry { };
+
   piccata = callPackage ../development/python-modules/piccata { };
 
   pickleshare = callPackage ../development/python-modules/pickleshare { };