diff --git a/pkgs/development/python-modules/amazon-ion/default.nix b/pkgs/development/python-modules/amazon-ion/default.nix
index 6e28c5da9978..b6b93d63efbf 100644
--- a/pkgs/development/python-modules/amazon-ion/default.nix
+++ b/pkgs/development/python-modules/amazon-ion/default.nix
@@ -12,7 +12,7 @@
 
 buildPythonPackage rec {
   pname = "amazon-ion";
-  version = "0.11.3";
+  version = "0.12.0";
   pyproject = true;
 
   disabled = pythonOlder "3.7";
@@ -23,7 +23,7 @@ buildPythonPackage rec {
     rev = "refs/tags/v${version}";
     # Test vectors require git submodule
     fetchSubmodules = true;
-    hash = "sha256-wA24ASd6+rTAqHNQ9ZGMnCK9ykJjogCtEWfrXY1B87o=";
+    hash = "sha256-L21FYl4Q+nhB3CU1maOxBHSLU+ox1POHtMio8SSZ/r0=";
   };
 
   postPatch = ''