diff --git a/pkgs/development/python-modules/chex/default.nix b/pkgs/development/python-modules/chex/default.nix
index bb873f2c3bfd..a06cb4ec84bb 100644
--- a/pkgs/development/python-modules/chex/default.nix
+++ b/pkgs/development/python-modules/chex/default.nix
@@ -12,16 +12,14 @@
 
 buildPythonPackage rec {
   pname = "chex";
-  # As of 2021-12-29, the latest official version has broken tests with jax 0.2.26:
-  # `AttributeError: module 'jax.interpreters.xla' has no attribute 'xb'`
-  version = "unstable-2021-12-16";
+  version = "0.1.2";
   format = "setuptools";
 
   src = fetchFromGitHub {
     owner = "deepmind";
     repo = pname;
-    rev = "5adc10e0b4218f8ec775567fca38b68bbad42a3a";
-    sha256 = "00xib6zv9pwid2q7wcr109qj3fa3g3b852skz8444kw7r0qxy7z3";
+    rev = "v${version}";
+    hash = "sha256-NtZYOHByKBcKmhRaNULwaQqxfoPRmgbtJ3cFHNfy4E8=";
   };
 
   propagatedBuildInputs = [
diff --git a/pkgs/development/python-modules/dm-haiku/default.nix b/pkgs/development/python-modules/dm-haiku/default.nix
index 03677faa689f..8a6eabfde0f5 100644
--- a/pkgs/development/python-modules/dm-haiku/default.nix
+++ b/pkgs/development/python-modules/dm-haiku/default.nix
@@ -21,7 +21,7 @@ buildPythonPackage rec {
     owner = "deepmind";
     repo = pname;
     rev = "v${version}";
-    sha256 = "sha256-qvKMeGPiWXvvyV+GZdTWdsC6Wp08AmP8nDtWk7sZtqM=";
+    hash = "sha256-qvKMeGPiWXvvyV+GZdTWdsC6Wp08AmP8nDtWk7sZtqM=";
   };
 
   propagatedBuildInputs = [
@@ -32,6 +32,7 @@ buildPythonPackage rec {
   checkInputs = [
     chex
     cloudpickle
+    dill
     dm-tree
     jaxlib
     pytest-xdist
@@ -55,6 +56,11 @@ buildPythonPackage rec {
     "haiku/_src/integration/jax2tf_test.py"
   ];
 
+  disabledTests = [
+    # See https://github.com/deepmind/dm-haiku/issues/366.
+    "test_jit_Recurrent"
+  ];
+
   meta = with lib; {
     description = "Haiku is a simple neural network library for JAX developed by some of the authors of Sonnet.";
     homepage = "https://github.com/deepmind/dm-haiku";