diff --git a/pkgs/development/python-modules/pikepdf/default.nix b/pkgs/development/python-modules/pikepdf/default.nix
index 025b17d19ae..5ae36f5fae2 100644
--- a/pkgs/development/python-modules/pikepdf/default.nix
+++ b/pkgs/development/python-modules/pikepdf/default.nix
@@ -22,12 +22,12 @@
 
 buildPythonPackage rec {
   pname = "pikepdf";
-  version = "1.6.2";
+  version = "1.6.4";
   disabled = ! isPy3k;
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "1x1b55znr0j4fib69l2h0xq0qmbf2nbxwbwd4f7y8r4sqi20239z";
+    sha256 = "50ad2f2903db21b9105c1092ef947b456134a77355b4386535492dc28a6a4e52";
   };
 
   buildInputs = [