diff --git a/nixos/modules/programs/tsm-client.nix b/nixos/modules/programs/tsm-client.nix
index 45d436221ee3..d31a1fb3f375 100644
--- a/nixos/modules/programs/tsm-client.nix
+++ b/nixos/modules/programs/tsm-client.nix
@@ -22,7 +22,7 @@ let
   serverOptions = { name, config, ... }: {
     freeformType = attrsOf (either scalarType (listOf scalarType));
     # Client system-options file directives are explained here:
-    # https://www.ibm.com/docs/en/storage-protect/8.1.20?topic=commands-processing-options
+    # https://www.ibm.com/docs/en/storage-protect/8.1.21?topic=commands-processing-options
     options.servername = mkOption {
       type = servernameType;
       default = name;
diff --git a/nixos/modules/services/backup/tsm.nix b/nixos/modules/services/backup/tsm.nix
index 6798b18b3af7..2d727dccdece 100644
--- a/nixos/modules/services/backup/tsm.nix
+++ b/nixos/modules/services/backup/tsm.nix
@@ -90,7 +90,7 @@ in
       environment.HOME = "/var/lib/tsm-backup";
       serviceConfig = {
         # for exit status description see
-        # https://www.ibm.com/docs/en/storage-protect/8.1.20?topic=clients-client-return-codes
+        # https://www.ibm.com/docs/en/storage-protect/8.1.21?topic=clients-client-return-codes
         SuccessExitStatus = "4 8";
         # The `-se` option must come after the command.
         # The `-optfile` option suppresses a `dsm.opt`-not-found warning.
diff --git a/nixos/tests/tsm-client-gui.nix b/nixos/tests/tsm-client-gui.nix
index c9632546db6e..ca10cddc411f 100644
--- a/nixos/tests/tsm-client-gui.nix
+++ b/nixos/tests/tsm-client-gui.nix
@@ -31,7 +31,7 @@ import ./make-test-python.nix ({ lib, pkgs, ... }: {
     machine.execute("DSM_LOG=/tmp dsmj -optfile=/dev/null >&2 &")
 
     # does it report the "TCP/IP connection failure" error code?
-    machine.wait_for_window("IBM Spectrum Protect")
+    machine.wait_for_window("IBM Storage Protect")
     machine.wait_for_text("ANS2610S")
     machine.send_key("esc")
 
diff --git a/pkgs/tools/backup/tsm-client/default.nix b/pkgs/tools/backup/tsm-client/default.nix
index e586e831b107..dedc7fdcd8e4 100644
--- a/pkgs/tools/backup/tsm-client/default.nix
+++ b/pkgs/tools/backup/tsm-client/default.nix
@@ -45,7 +45,7 @@
 # point to this derivations `/dsmi_dir` directory symlink.
 # Other environment variables might be necessary,
 # depending on local configuration or usage; see:
-# https://www.ibm.com/docs/en/spectrum-protect/8.1.20?topic=solaris-set-api-environment-variables
+# https://www.ibm.com/docs/en/storage-protect/8.1.21?topic=solaris-set-api-environment-variables
 
 
 # The newest version of TSM client should be discoverable by
@@ -104,10 +104,10 @@ let
 
   unwrapped = stdenv.mkDerivation rec {
     name = "tsm-client-${version}-unwrapped";
-    version = "8.1.20.0";
+    version = "8.1.21.0";
     src = fetchurl {
       url = mkSrcUrl version;
-      hash = "sha512-UZ5hRXGlB/1B4gZ8/i9OCHsxSuRkbAcp195zl/M75HtTi8o0rOfOh3LMmn4x4/M1V8d60ix7Tn4Mv8xkm7QXzw==";
+      hash = "sha512-iXkVYQsqbNhQJmrYl5a5433iSl6kg6YzlTlgCzpFGslMn+3ynSmYn8Rtxwitp931SwmV4a53tGctSuisz8pOCg==";
     };
     inherit meta passthru;