diff --git a/pkgs/development/python-modules/edward/default.nix b/pkgs/development/python-modules/edward/default.nix
index ac2d5023cc97..05171c22d18e 100644
--- a/pkgs/development/python-modules/edward/default.nix
+++ b/pkgs/development/python-modules/edward/default.nix
@@ -1,5 +1,5 @@
 { lib, buildPythonPackage, fetchPypi, isPy27, pythonAtLeast
-, Keras, numpy, scipy, six, tensorflow }:
+, keras, numpy, scipy, six, tensorflow }:
 
 buildPythonPackage rec {
   pname = "edward";
@@ -15,7 +15,7 @@ buildPythonPackage rec {
   # disabled for now due to Tensorflow trying to create files in $HOME:
   doCheck = false;
 
-  propagatedBuildInputs = [ Keras numpy scipy six tensorflow ];
+  propagatedBuildInputs = [ keras numpy scipy six tensorflow ];
 
   meta = with lib; {
     description = "Probabilistic programming language using Tensorflow";
diff --git a/pkgs/development/python-modules/einops/default.nix b/pkgs/development/python-modules/einops/default.nix
index 34510762abf7..a2de3a70971d 100644
--- a/pkgs/development/python-modules/einops/default.nix
+++ b/pkgs/development/python-modules/einops/default.nix
@@ -10,6 +10,7 @@
 , pytorch
 , mxnet
 , tensorflow
+, keras
 }:
 
 buildPythonPackage rec {
@@ -35,6 +36,7 @@ buildPythonPackage rec {
     pytorch
     mxnet
     tensorflow
+    keras
   ];
 
   # No CUDA in sandbox
diff --git a/pkgs/development/python-modules/keras-preprocessing/default.nix b/pkgs/development/python-modules/keras-preprocessing/default.nix
index d62a179136f4..a0d9d4bb153d 100644
--- a/pkgs/development/python-modules/keras-preprocessing/default.nix
+++ b/pkgs/development/python-modules/keras-preprocessing/default.nix
@@ -1,4 +1,4 @@
-{ lib, buildPythonPackage, fetchPypi, numpy, six, scipy, pillow, pytest, Keras }:
+{ lib, buildPythonPackage, fetchPypi, numpy, six, scipy, pillow, pytest, keras }:
 
 buildPythonPackage rec {
   pname = "Keras_Preprocessing";
@@ -17,7 +17,7 @@ buildPythonPackage rec {
   ];
 
   checkInputs = [
-    pytest Keras
+    pytest keras
   ];
 
   checkPhase = ''
diff --git a/pkgs/development/python-modules/keras/default.nix b/pkgs/development/python-modules/keras/default.nix
index 28b09222b472..2b9a269e280f 100644
--- a/pkgs/development/python-modules/keras/default.nix
+++ b/pkgs/development/python-modules/keras/default.nix
@@ -5,12 +5,13 @@
 }:
 
 buildPythonPackage rec {
-  pname = "Keras";
-  version = "2.4.3";
+  pname = "keras";
+  version = "2.7.0";
+  format = "wheel";
 
   src = fetchPypi {
-    inherit pname version;
-    sha256 = "fedd729b52572fb108a98e3d97e1bac10a81d3917d2103cc20ab2a5f03beb973";
+    inherit format pname version;
+    sha256 = "0c33ae1f728064ca0d35dfba999e9c316f03623bf5688c82fb83cc74a80ea248";
   };
 
   checkInputs = [
diff --git a/pkgs/development/python-modules/mask-rcnn/default.nix b/pkgs/development/python-modules/mask-rcnn/default.nix
index ae07e7928a6a..2ef6ff5c56d9 100644
--- a/pkgs/development/python-modules/mask-rcnn/default.nix
+++ b/pkgs/development/python-modules/mask-rcnn/default.nix
@@ -1,10 +1,11 @@
 { buildPythonPackage
 , cython
 , fetchFromGitHub
+, fetchpatch
 , h5py
 , imgaug
 , ipython
-, Keras
+, keras
 , lib
 , matplotlib
 , numpy
@@ -26,13 +27,29 @@ buildPythonPackage rec {
     sha256 = "13s3q9yh2q9m9vyksd269mww3bni4q2w7q5l419q70ca075qp8zp";
   };
 
+  patches = [
+    # Fix for TF2:
+    # https://github.com/matterport/Mask_RCNN/issues/2734
+    (fetchpatch {
+      url = "https://github.com/BupyeongHealer/Mask_RCNN_tf_2.x/commit/7957839fe2b248f2f22c7e991ead12068ddc6cfc.diff";
+      excludes = [ "mrcnn/model.py" ];
+      sha256 = "sha256-70BGrx6X1uJDA2025f0YTlreT2uB3n35yIzuhf+ypVc=";
+    })
+  ];
+
+  # Fix for recent Keras
+  postPatch = ''
+    substituteInPlace mrcnn/model.py \
+      --replace "KE." "KL."
+  '';
+
   nativeBuildInputs = [ cython ];
 
   propagatedBuildInputs = [
     h5py
     imgaug
     ipython
-    Keras
+    keras
     matplotlib
     numpy
     opencv3
diff --git a/pkgs/development/python-modules/optuna/default.nix b/pkgs/development/python-modules/optuna/default.nix
index b7247083be43..6dde9ededb50 100644
--- a/pkgs/development/python-modules/optuna/default.nix
+++ b/pkgs/development/python-modules/optuna/default.nix
@@ -9,7 +9,7 @@
 , xgboost
 , mpi4py
 , lightgbm
-, Keras
+, keras
 , mxnet
 , scikit-optimize
 , tensorflow
@@ -49,7 +49,7 @@ buildPythonPackage rec {
     xgboost
     mpi4py
     lightgbm
-    Keras
+    keras
     mxnet
     scikit-optimize
     tensorflow
diff --git a/pkgs/development/python-modules/tensorflow/default.nix b/pkgs/development/python-modules/tensorflow/default.nix
index b43ac71ba41e..ae55ac637e97 100644
--- a/pkgs/development/python-modules/tensorflow/default.nix
+++ b/pkgs/development/python-modules/tensorflow/default.nix
@@ -4,7 +4,7 @@
 , buildPythonPackage, pythonOlder, python
 # Python libraries
 , numpy, tensorflow-tensorboard, absl-py
-, setuptools, wheel, Keras, keras-preprocessing, google-pasta
+, setuptools, wheel, keras, keras-preprocessing, google-pasta
 , opt-einsum, astunparse, h5py
 , termcolor, grpcio, six, wrapt, protobuf, tensorflow-estimator
 , dill, flatbuffers-python, tblib, typing-extensions
@@ -479,7 +479,7 @@ in buildPythonPackage {
   # Actual tests are slow and impure.
   # TODO try to run them anyway
   # TODO better test (files in tensorflow/tools/ci_build/builds/*test)
-  checkInputs = [ Keras ];
+  checkInputs = [ keras ];
   checkPhase = ''
     ${python.interpreter} <<EOF
     # A simple "Hello world"
diff --git a/pkgs/development/python-modules/umap-learn/default.nix b/pkgs/development/python-modules/umap-learn/default.nix
index df635d856d94..81d70b0afc0d 100644
--- a/pkgs/development/python-modules/umap-learn/default.nix
+++ b/pkgs/development/python-modules/umap-learn/default.nix
@@ -8,19 +8,20 @@
 , numba
 , pynndescent
 , tensorflow
+, tqdm
 , pytestCheckHook
-, Keras
+, keras
 }:
 
 buildPythonPackage rec {
   pname = "umap-learn";
-  version = "0.5.1";
+  version = "0.5.2";
 
   src = fetchFromGitHub {
     owner = "lmcinnes";
     repo = "umap";
     rev = version;
-    sha256 = "0favphngcz5jvyqs06x07hk552lvl9qx3vka8r4x0xmv88gsg349";
+    sha256 = "sha256-JfYuuE1BP+HdiEl7l01sZ/XXlEwHyAsLjK9nqhRd/3o=";
   };
 
   propagatedBuildInputs = [
@@ -29,13 +30,14 @@ buildPythonPackage rec {
     scipy
     numba
     pynndescent
+    tqdm
   ];
 
   checkInputs = [
     nose
     tensorflow
     pytestCheckHook
-    Keras
+    keras
   ];
 
   preCheck = ''
diff --git a/pkgs/top-level/python-aliases.nix b/pkgs/top-level/python-aliases.nix
index f8c8306f8313..3438d68a2b1f 100644
--- a/pkgs/top-level/python-aliases.nix
+++ b/pkgs/top-level/python-aliases.nix
@@ -59,6 +59,7 @@ mapAliases ({
   hbmqtt = throw "hbmqtt was removed because it is no longer maintained"; # added 2021-11-07
   IMAPClient = imapclient; # added 2021-10-28
   jupyter_client = jupyter-client; # added 2021-10-15
+  Keras = keras; # added 2021-11-25
   lammps-cython = throw "lammps-cython no longer builds and is unmaintained"; # added 2021-07-04
   MechanicalSoup = mechanicalsoup; # added 2021-06-01
   pam = python-pam; # added 2020-09-07.
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index c1941da85a5f..bc371b95a3ff 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -4219,7 +4219,7 @@ in {
 
   keras-applications = callPackage ../development/python-modules/keras-applications { };
 
-  Keras = callPackage ../development/python-modules/keras { };
+  keras = callPackage ../development/python-modules/keras { };
 
   keras-preprocessing = callPackage ../development/python-modules/keras-preprocessing { };