diff --git a/pkgs/development/python-modules/gymnasium/default.nix b/pkgs/development/python-modules/gymnasium/default.nix
index 28037b9a6e66..c70a4081cebb 100644
--- a/pkgs/development/python-modules/gymnasium/default.nix
+++ b/pkgs/development/python-modules/gymnasium/default.nix
@@ -32,7 +32,7 @@
 
 buildPythonPackage rec {
   pname = "gymnasium";
-  version = "1.0.0";
+  version = "1.1.0";
 
   pyproject = true;
 
@@ -40,7 +40,7 @@ buildPythonPackage rec {
     owner = "Farama-Foundation";
     repo = "gymnasium";
     tag = "v${version}";
-    hash = "sha256-Qchuz08yJ0giVrtKLC9vBgr28JrHQyAOCuoS239ivVw=";
+    hash = "sha256-o+rxEMxiw4BP1lTk0xTXjqXS2C9vuHBzE8F7ZEVHmIc=";
   };
 
   build-system = [ setuptools ];
diff --git a/pkgs/development/python-modules/stable-baselines3/default.nix b/pkgs/development/python-modules/stable-baselines3/default.nix
index 0cca87dd9857..2963770bf252 100644
--- a/pkgs/development/python-modules/stable-baselines3/default.nix
+++ b/pkgs/development/python-modules/stable-baselines3/default.nix
@@ -34,6 +34,10 @@ buildPythonPackage rec {
 
   build-system = [ setuptools ];
 
+  pythonRelaxDeps = [
+    "gymnasium"
+  ];
+
   dependencies = [
     cloudpickle
     gymnasium
diff --git a/pkgs/development/python-modules/tianshou/default.nix b/pkgs/development/python-modules/tianshou/default.nix
index 9029669bcd05..9078317fc055 100644
--- a/pkgs/development/python-modules/tianshou/default.nix
+++ b/pkgs/development/python-modules/tianshou/default.nix
@@ -1,39 +1,48 @@
 {
   lib,
-  ale-py,
+  stdenv,
   buildPythonPackage,
-  cython,
-  deepdiff,
-  docstring-parser,
+  pythonOlder,
   fetchFromGitHub,
+
+  # build-system
+  poetry-core,
+
+  # dependencies
+  deepdiff,
   gymnasium,
   h5py,
-  imageio,
-  joblib,
-  jsonargparse,
   matplotlib,
-  mujoco,
   numba,
   numpy,
-  opencv,
   overrides,
   packaging,
   pandas,
   pettingzoo,
-  poetry-core,
-  pybox2d,
-  pybullet,
-  pygame,
-  pymunk,
-  pytestCheckHook,
-  pythonOlder,
-  scipy,
   sensai-utils,
-  shimmy,
-  swig,
   tensorboard,
   torch,
   tqdm,
+
+  # optional-dependencies
+  docstring-parser,
+  jsonargparse,
+  ale-py,
+  opencv,
+  shimmy,
+  pybox2d,
+  pygame,
+  swig,
+  mujoco,
+  imageio,
+  cython,
+  pybullet,
+  joblib,
+  scipy,
+
+  # tests
+  pymunk,
+  pytestCheckHook,
 }:
 
 buildPythonPackage rec {
@@ -156,20 +165,26 @@ buildPythonPackage rec {
     "test/offline"
   ];
 
-  disabledTests = [
-    # AttributeError: 'TimeLimit' object has no attribute 'test_attribute'
-    "test_attr_unwrapped"
-    # Failed: DID NOT RAISE <class 'TypeError'>
-    "test_batch"
-    # Failed: Raised AssertionError
-    "test_vecenv"
-  ];
+  disabledTests =
+    [
+      # AttributeError: 'TimeLimit' object has no attribute 'test_attribute'
+      "test_attr_unwrapped"
+      # Failed: DID NOT RAISE <class 'TypeError'>
+      "test_batch"
+      # Failed: Raised AssertionError
+      "test_vecenv"
+    ]
+    ++ lib.optionals stdenv.hostPlatform.isDarwin [
+      # Fatal Python error: Aborted
+      # pettingzoo/classic/tictactoe/tictactoe.py", line 254 in reset
+      "test_tic_tac_toe"
+    ];
 
-  meta = with lib; {
+  meta = {
     description = "Elegant PyTorch deep reinforcement learning library";
     homepage = "https://github.com/thu-ml/tianshou";
     changelog = "https://github.com/thu-ml/tianshou/releases/tag/v${version}";
-    license = licenses.mit;
-    maintainers = with maintainers; [ derdennisop ];
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ derdennisop ];
   };
 }