diff --git a/third_party/nixpkgs/patches/pr155145.patch b/third_party/nixpkgs/patches/pr155145.patch
new file mode 100644
index 0000000000..8c5510fc8f
--- /dev/null
+++ b/third_party/nixpkgs/patches/pr155145.patch
@@ -0,0 +1,68 @@
+From 686db3dcd31bab3451a7f83b2d23b14ce2e02028 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Robert=20Sch=C3=BCtz?= <nix@dotlambda.de>
+Date: Tue, 11 Jan 2022 20:22:46 +0000
+Subject: [PATCH] python2Packages.pyyaml: init at 5.4.1.1
+
+---
+ pkgs/development/python-modules/pyyaml/5.nix | 38 ++++++++++++++++++++
+ pkgs/top-level/python2-packages.nix          |  2 ++
+ 2 files changed, 40 insertions(+)
+ create mode 100644 pkgs/development/python-modules/pyyaml/5.nix
+
+diff --git a/pkgs/development/python-modules/pyyaml/5.nix b/pkgs/development/python-modules/pyyaml/5.nix
+new file mode 100644
+index 0000000000000..3edfae90e668b
+--- /dev/null
++++ b/pkgs/development/python-modules/pyyaml/5.nix
+@@ -0,0 +1,38 @@
++{ lib
++, buildPythonPackage
++, fetchFromGitHub
++, cython
++, libyaml
++, isPy27
++, python
++}:
++
++buildPythonPackage rec {
++  pname = "PyYAML";
++  version = "5.4.1.1";
++
++  src = fetchFromGitHub {
++    owner = "yaml";
++    repo = "pyyaml";
++    rev = version;
++    sha256 = "1v386gzdvsjg0mgix6v03rd0cgs9dl81qvn3m547849jm8r41dx8";
++  };
++
++  nativeBuildInputs = [ cython ];
++
++  buildInputs = [ libyaml ];
++
++  checkPhase = ''
++    runHook preCheck
++    PYTHONPATH=""tests/lib":$PYTHONPATH" ${python.interpreter} -m test_all
++    runHook postCheck
++  '';
++
++  pythonImportsCheck = [ "yaml" ];
++
++  meta = with lib; {
++    description = "The next generation YAML parser and emitter for Python";
++    homepage = "https://github.com/yaml/pyyaml";
++    license = licenses.mit;
++  };
++}
+diff --git a/pkgs/top-level/python2-packages.nix b/pkgs/top-level/python2-packages.nix
+index 01f77c482d1bf..b7d9d4e95a458 100644
+--- a/pkgs/top-level/python2-packages.nix
++++ b/pkgs/top-level/python2-packages.nix
+@@ -122,6 +122,8 @@ with self; with super; {
+ 
+   pytest-xdist = callPackage ../development/python-modules/pytest-xdist/1.nix { };
+ 
++  pyyaml = callPackage ../development/python-modules/pyyaml/5.nix { };
++
+   qpid-python = callPackage ../development/python-modules/qpid-python { };
+ 
+   recoll = disabled super.recoll;
diff --git a/third_party/nixpkgs/patches/series b/third_party/nixpkgs/patches/series
index f2cc68009d..b0d24d4826 100644
--- a/third_party/nixpkgs/patches/series
+++ b/third_party/nixpkgs/patches/series
@@ -1,3 +1,4 @@
 pomerium-fix.patch
 pomerium-fix2.patch
 nvidia-sideband-socket.patch
+pr155145.patch
diff --git a/third_party/nixpkgs/pkgs/development/python-modules/pyyaml/5.nix b/third_party/nixpkgs/pkgs/development/python-modules/pyyaml/5.nix
new file mode 100644
index 0000000000..3edfae90e6
--- /dev/null
+++ b/third_party/nixpkgs/pkgs/development/python-modules/pyyaml/5.nix
@@ -0,0 +1,38 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, cython
+, libyaml
+, isPy27
+, python
+}:
+
+buildPythonPackage rec {
+  pname = "PyYAML";
+  version = "5.4.1.1";
+
+  src = fetchFromGitHub {
+    owner = "yaml";
+    repo = "pyyaml";
+    rev = version;
+    sha256 = "1v386gzdvsjg0mgix6v03rd0cgs9dl81qvn3m547849jm8r41dx8";
+  };
+
+  nativeBuildInputs = [ cython ];
+
+  buildInputs = [ libyaml ];
+
+  checkPhase = ''
+    runHook preCheck
+    PYTHONPATH=""tests/lib":$PYTHONPATH" ${python.interpreter} -m test_all
+    runHook postCheck
+  '';
+
+  pythonImportsCheck = [ "yaml" ];
+
+  meta = with lib; {
+    description = "The next generation YAML parser and emitter for Python";
+    homepage = "https://github.com/yaml/pyyaml";
+    license = licenses.mit;
+  };
+}
diff --git a/third_party/nixpkgs/pkgs/top-level/python2-packages.nix b/third_party/nixpkgs/pkgs/top-level/python2-packages.nix
index 01f77c482d..b7d9d4e95a 100644
--- a/third_party/nixpkgs/pkgs/top-level/python2-packages.nix
+++ b/third_party/nixpkgs/pkgs/top-level/python2-packages.nix
@@ -122,6 +122,8 @@ with self; with super; {
 
   pytest-xdist = callPackage ../development/python-modules/pytest-xdist/1.nix { };
 
+  pyyaml = callPackage ../development/python-modules/pyyaml/5.nix { };
+
   qpid-python = callPackage ../development/python-modules/qpid-python { };
 
   recoll = disabled super.recoll;