diff --git a/package-lock.json b/package-lock.json
index ad35b8c4..8e8a2868 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,7 +9,7 @@
       "version": "0.42.0",
       "license": "Apache-2.0",
       "dependencies": {
-        "@agentclientprotocol/sdk": "0.24.0",
+        "@agentclientprotocol/sdk": "0.25.0",
         "@anthropic-ai/claude-agent-sdk": "0.3.165",
         "zod": "^3.25.0 || ^4.0.0"
       },
@@ -32,9 +32,9 @@
       }
     },
     "node_modules/@agentclientprotocol/sdk": {
-      "version": "0.24.0",
-      "resolved": "https://registry.npmjs.org/@agentclientprotocol/sdk/-/sdk-0.24.0.tgz",
-      "integrity": "sha512-vvu9appvGvfYstBj19C6NCepV6SvUhY5VRv60KUZ4XzhTah/olOYul5Zo4C+x2enyshMSvgB2mm/OEmrsHaSmA==",
+      "version": "0.25.0",
+      "resolved": "https://registry.npmjs.org/@agentclientprotocol/sdk/-/sdk-0.25.0.tgz",
+      "integrity": "sha512-wU1VgXNtMvdVotX49txc3WJUDV+/QbLpsgjMvFhlRmp37osdLbI7L7y+iwAlQATwfjLxcv1r1p3ZxZBcXlGhcQ==",
       "license": "Apache-2.0",
       "peerDependencies": {
         "zod": "^3.25.0 || ^4.0.0"
diff --git a/package.json b/package.json
index afa49a0a..25443873 100644
--- a/package.json
+++ b/package.json
@@ -60,7 +60,7 @@
   "author": "Zed Industries",
   "license": "Apache-2.0",
   "dependencies": {
-    "@agentclientprotocol/sdk": "0.24.0",
+    "@agentclientprotocol/sdk": "0.25.0",
     "@anthropic-ai/claude-agent-sdk": "0.3.165",
     "zod": "^3.25.0 || ^4.0.0"
   },
diff --git a/src/acp-agent.ts b/src/acp-agent.ts
index 3d073f29..f24cb383 100644
--- a/src/acp-agent.ts
+++ b/src/acp-agent.ts
@@ -1708,7 +1708,7 @@ export class ClaudeAcpAgent implements Agent {
     return {};
   }
 
-  async unstable_deleteSession(params: DeleteSessionRequest): Promise<DeleteSessionResponse> {
+  async deleteSession(params: DeleteSessionRequest): Promise<DeleteSessionResponse> {
     // Tear down any active in-memory state first so the on-disk file isn't
     // recreated by an outstanding query writing to it.
     if (this.sessions[params.sessionId]) {
diff --git a/src/tests/acp-agent.test.ts b/src/tests/acp-agent.test.ts
index f0c35523..d10fafb7 100644
--- a/src/tests/acp-agent.test.ts
+++ b/src/tests/acp-agent.test.ts
@@ -2023,7 +2023,7 @@ describe("session/delete", () => {
     const agent = createMockAgent();
     const session = injectSession(agent, "session-1");
 
-    const result = await agent.unstable_deleteSession({ sessionId: "session-1" });
+    const result = await agent.deleteSession({ sessionId: "session-1" });
 
     expect(result).toEqual({});
     expect(agent.sessions["session-1"]).toBeUndefined();
@@ -2036,7 +2036,7 @@ describe("session/delete", () => {
   it("deletes a session from disk that is not currently active", async () => {
     const agent = createMockAgent();
 
-    const result = await agent.unstable_deleteSession({ sessionId: "not-active" });
+    const result = await agent.deleteSession({ sessionId: "not-active" });
 
     expect(result).toEqual({});
     expect(deleteSession).toHaveBeenCalledWith("not-active");
@@ -2046,7 +2046,7 @@ describe("session/delete", () => {
     const agent = createMockAgent();
     vi.mocked(deleteSession).mockRejectedValueOnce(new Error("Session not found on disk"));
 
-    await expect(agent.unstable_deleteSession({ sessionId: "missing" })).rejects.toThrow(
+    await expect(agent.deleteSession({ sessionId: "missing" })).rejects.toThrow(
       "Session not found on disk",
     );
   });
@@ -2056,7 +2056,7 @@ describe("session/delete", () => {
     injectSession(agent, "session-a");
     injectSession(agent, "session-b");
 
-    await agent.unstable_deleteSession({ sessionId: "session-a" });
+    await agent.deleteSession({ sessionId: "session-a" });
 
     expect(agent.sessions["session-a"]).toBeUndefined();
     expect(agent.sessions["session-b"]).toBeDefined();