diff --git a/pkgs/development/python-modules/finetuning-scheduler/default.nix b/pkgs/development/python-modules/finetuning-scheduler/default.nix
index 113e77b2dca2..85b46d882a52 100644
--- a/pkgs/development/python-modules/finetuning-scheduler/default.nix
+++ b/pkgs/development/python-modules/finetuning-scheduler/default.nix
@@ -27,6 +27,14 @@ buildPythonPackage rec {
     hash = "sha256-AfkrWuqpFS71Zrh5NsamzxMitKCsqPF50F9zTDdDhRg=";
   };
 
+  # See https://github.com/speediedan/finetuning-scheduler/pull/21
+  postPatch = ''
+    substituteInPlace src/finetuning_scheduler/strategy_adapters/base.py \
+      --replace-fail \
+        "from lightning.fabric.utilities.types import ReduceLROnPlateau" \
+        "from torch.optim.lr_scheduler import ReduceLROnPlateau"
+  '';
+
   build-system = [ setuptools ];
 
   pythonRelaxDeps = [
diff --git a/pkgs/development/python-modules/pytorch-lightning/default.nix b/pkgs/development/python-modules/pytorch-lightning/default.nix
index d8e90c7c0cc2..979f6c4b0fa8 100644
--- a/pkgs/development/python-modules/pytorch-lightning/default.nix
+++ b/pkgs/development/python-modules/pytorch-lightning/default.nix
@@ -24,14 +24,14 @@
 
 buildPythonPackage rec {
   pname = "pytorch-lightning";
-  version = "2.5.5";
+  version = "2.5.6";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "Lightning-AI";
     repo = "pytorch-lightning";
     tag = version;
-    hash = "sha256-8CDVvgaxnFWO4Fl5lW/+cn/1WZCgVXYys86iOVNYUfY=";
+    hash = "sha256-ojmE0d6Wy4UqQu4kBBE2qtQ4AYqplHOB7wJ7hEte664=";
   };
 
   preConfigure = ''