diff --git a/pkgs/development/python-modules/tinycss2/default.nix b/pkgs/development/python-modules/tinycss2/default.nix
index 23a7a1f91fdd..cca453789b7c 100644
--- a/pkgs/development/python-modules/tinycss2/default.nix
+++ b/pkgs/development/python-modules/tinycss2/default.nix
@@ -10,7 +10,7 @@
 
 buildPythonPackage rec {
   pname = "tinycss2";
-  version = "1.4.0";
+  version = "1.5.1";
   pyproject = true;
 
   src = fetchFromGitHub {
@@ -19,7 +19,7 @@ buildPythonPackage rec {
     tag = "v${version}";
     # for tests
     fetchSubmodules = true;
-    hash = "sha256-GVymUobWAE0YS65lti9dXRIIGpx0YkwF/vSb3y7cpYY=";
+    hash = "sha256-ZVmdHrqfF5fvBvHLaG2B4m1zek4wfEYArkntWzOqhfM=";
   };
 
   build-system = [ flit-core ];