diff --git a/pkgs/development/python-modules/ihm/default.nix b/pkgs/development/python-modules/ihm/default.nix
index 1dfcec78bbda..2cfb69178b10 100644
--- a/pkgs/development/python-modules/ihm/default.nix
+++ b/pkgs/development/python-modules/ihm/default.nix
@@ -10,14 +10,14 @@
 
 buildPythonPackage rec {
   pname = "ihm";
-  version = "0.43";
+  version = "1.0";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "ihmwg";
     repo = "python-ihm";
     rev = "refs/tags/${version}";
-    hash = "sha256-6tjIxe3JYvtWG5z4ltrkUSTxh1q2BDq2I2siYt7dCF8=";
+    hash = "sha256-a1M3YihN71M9TnkldAzN6N1UuPksDk6SPiBgr4HyC8g=";
   };
 
   nativeBuildInputs = [