diff --git a/src/albedo/harness/extensions/claude/wire.gleam b/src/albedo/harness/extensions/claude/wire.gleam
index 0484129..c299224 100644
--- a/src/albedo/harness/extensions/claude/wire.gleam
+++ b/src/albedo/harness/extensions/claude/wire.gleam
@@ -124,7 +124,7 @@ pub fn encode(
           #("authorization", "Bearer " <> access),
           #("anthropic-version", "2023-06-01"),
           #("anthropic-beta", "claude-code-20250219,oauth-2025-04-20"),
-          #("user-agent", "claude-cli/2.1.261"),
+          #("user-agent", "claude-cli/2.1.283"),
           #("x-app", "cli"),
           #("anthropic-dangerous-direct-browser-access", "true"),
           #("content-type", "application/json"),
diff --git a/test/harness/claude_test.gleam b/test/harness/claude_test.gleam
index c9c008d..26fe5ea 100644
--- a/test/harness/claude_test.gleam
+++ b/test/harness/claude_test.gleam
@@ -87,7 +87,7 @@ pub fn claude_messages_request_carries_client_identity_and_tools_test() {
     wire.encode("sk-ant-oat-test", request)
   assert list_key(headers, "anthropic-beta")
     == Ok("claude-code-20250219,oauth-2025-04-20")
-  assert list_key(headers, "user-agent") == Ok("claude-cli/2.1.261")
+  assert list_key(headers, "user-agent") == Ok("claude-cli/2.1.283")
   let assert Ok(value) = json.parse(string_tree.to_string(body), decode.dynamic)
   let assert Ok(system) =
     decode.run(