diff --git a/pkgs/tools/security/ibm-sw-tpm2/default.nix b/pkgs/tools/security/ibm-sw-tpm2/default.nix
index c177726bbb1..d556566a7d5 100644
--- a/pkgs/tools/security/ibm-sw-tpm2/default.nix
+++ b/pkgs/tools/security/ibm-sw-tpm2/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   pname = "ibm-sw-tpm2";
-  version = "1637";
+  version = "1661";
 
   src = fetchurl {
     url = "mirror://sourceforge/ibmswtpm2/ibmtpm${version}.tar.gz";
-    sha256 = "09z3wbv38dc8wnw1q961s6bcd0kvz2xkjp6dxg4kn914fwzlqfnx";
+    sha256 = "sha256-VRRZKK0rJPNL5qDqz5+0kuEODqkZuEKMch+pcOhdYUc=";
   };
 
   buildInputs = [ openssl ];