diff --git a/pkgs/development/python-modules/pycrdt/Cargo.lock b/pkgs/development/python-modules/pycrdt/Cargo.lock
index a71c586dbe55..698d2fc51ecb 100644
--- a/pkgs/development/python-modules/pycrdt/Cargo.lock
+++ b/pkgs/development/python-modules/pycrdt/Cargo.lock
@@ -162,9 +162,9 @@ dependencies = [
 
 [[package]]
 name = "libc"
-version = "0.2.171"
+version = "0.2.172"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c19937216e9d3aa9956d9bb8dfc0b0c8beb6058fc4f7a4dc4d850edf86a237d6"
+checksum = "d750af042f7ef4f724306de029d18836c26c1765a54a6a3f094cbd23a7267ffa"
 
 [[package]]
 name = "lock_api"
@@ -245,7 +245,7 @@ dependencies = [
 
 [[package]]
 name = "pycrdt"
-version = "0.12.12"
+version = "0.12.13"
 dependencies = [
  "pyo3",
  "yrs",
diff --git a/pkgs/development/python-modules/pycrdt/default.nix b/pkgs/development/python-modules/pycrdt/default.nix
index bd3bc1cd4a97..a6c481bd3ddc 100644
--- a/pkgs/development/python-modules/pycrdt/default.nix
+++ b/pkgs/development/python-modules/pycrdt/default.nix
@@ -19,14 +19,14 @@
 
 buildPythonPackage rec {
   pname = "pycrdt";
-  version = "0.12.12";
+  version = "0.12.13";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "jupyter-server";
     repo = "pycrdt";
     tag = version;
-    hash = "sha256-qRr6L27X0g0mvxPECijunpxJilse9fzdKAQZOM0MoDQ=";
+    hash = "sha256-EI8LrT5wddmmw3D5C+IhJnViGnSbHWMD3WFp/f1hY7M=";
   };
 
   postPatch = ''
@@ -53,6 +53,11 @@ buildPythonPackage rec {
     y-py
   ];
 
+  pytestFlagsArray = [
+    "-W"
+    "ignore::pytest.PytestUnknownMarkWarning" # requires unpackaged pytest-mypy-testing
+  ];
+
   passthru.updateScript = nix-update-script { extraArgs = [ "--generate-lockfile" ]; };
 
   meta = {