diff --git a/pkgs/python-packages.nix b/pkgs/python-packages.nix
--- a/pkgs/python-packages.nix
+++ b/pkgs/python-packages.nix
@@ -315,13 +315,13 @@
     };
   };
   cssselect = super.buildPythonPackage {
-    name = "cssselect-1.0.1";
+    name = "cssselect-1.0.3";
     buildInputs = with self; [];
     doCheck = false;
     propagatedBuildInputs = with self; [];
     src = fetchurl {
-      url = "https://files.pythonhosted.org/packages/77/ff/9c865275cd19290feba56344eba570e719efb7ca5b34d67ed12b22ebbb0d/cssselect-1.0.1.tar.gz";
-      sha256 = "73db1c054b9348409e2862fc6c0dde5c4e4fbe4da64c5c5a9e05fbea45744077";
+      url = "https://files.pythonhosted.org/packages/52/ea/f31e1d2e9eb130fda2a631e22eac369dc644e8807345fbed5113f2d6f92b/cssselect-1.0.3.tar.gz";
+      sha256 = "066d8bc5229af09617e24b3ca4d52f1f9092d9e061931f4184cd572885c23204";
     };
     meta = {
       license = [ pkgs.lib.licenses.bsdOriginal ];
diff --git a/requirements.txt b/requirements.txt
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ channelstream==0.5.2
 click==6.6
 colander==1.4.0
 configobj==5.0.6
-cssselect==1.0.1
+cssselect==1.0.3
 decorator==4.1.2
 deform==2.0.5
 docutils==0.14.0