diff --git a/bun.lock b/bun.lock
index 58641de..3781f42 100644
--- a/bun.lock
+++ b/bun.lock
@@ -6,7 +6,7 @@
       "name": "opencode-mission-control",
       "dependencies": {
         "@opencode-ai/plugin": "^1.0.85",
-        "zod": "^3.22.0",
+        "zod": "^4.3.6",
       },
       "devDependencies": {
         "@types/bun": "latest",
@@ -514,7 +514,7 @@
 
     "yoctocolors": ["yoctocolors@2.1.2", "", {}, "sha512-CzhO+pFNo8ajLM2d2IW/R93ipy99LWjtwblvC1RsoSUMZgyLbYFr221TnSNT7GjGdYui6P459mw9JH/g/zW2ug=="],
 
-    "zod": ["zod@3.25.76", "", {}, "sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ=="],
+    "zod": ["zod@4.3.6", "", {}, "sha512-rftlrkhHZOcjDwkGlnUtZZkvaPHCsDATp4pGpuOOMDaTdDDXF91wuVDJoWoPsKX/3YPQ5fHuF3STjcYyKr+Qhg=="],
 
     "@actions/http-client/undici": ["undici@6.23.0", "", {}, "sha512-VfQPToRA5FZs/qJxLIinmU59u0r7LXqoJkCzinq3ckNJp3vKEh7jTWN589YQ5+aoAC/TGRLyJLCPKcLQbM8r9g=="],
 
diff --git a/package.json b/package.json
index af1d746..6cf6cdb 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,7 @@
   },
   "dependencies": {
     "@opencode-ai/plugin": "^1.0.85",
-    "zod": "^3.22.0"
+    "zod": "^4.3.6"
   },
   "devDependencies": {
     "@types/bun": "latest",
diff --git a/src/lib/config.ts b/src/lib/config.ts
index ea0f90d..2cfd6a9 100644
--- a/src/lib/config.ts
+++ b/src/lib/config.ts
@@ -60,7 +60,7 @@ export async function loadConfig(): Promise<MCConfig> {
     return result;
   } catch (error) {
     if (error instanceof z.ZodError) {
-      throw new Error(`Invalid config in ${filePath}: ${error.errors.map(e => `${e.path.join('.')}: ${e.message}`).join(', ')}`);
+      throw new Error(`Invalid config in ${filePath}: ${error.issues.map(e => `${e.path.join('.')}: ${e.message}`).join(', ')}`);
     }
     throw new Error(`Failed to load config from ${filePath}: ${error}`);
   }
diff --git a/src/lib/job-state.ts b/src/lib/job-state.ts
index 2d74f81..2ec90a3 100644
--- a/src/lib/job-state.ts
+++ b/src/lib/job-state.ts
@@ -76,7 +76,7 @@ export async function loadJobState(): Promise<JobState> {
     return JobStateSchema.parse(parsed);
   } catch (error) {
     if (error instanceof z.ZodError) {
-      throw new Error(`Invalid job state in ${filePath}: ${error.errors.map(e => `${e.path.join('.')}: ${e.message}`).join(', ')}`);
+      throw new Error(`Invalid job state in ${filePath}: ${error.issues.map(e => `${e.path.join('.')}: ${e.message}`).join(', ')}`);
     }
     throw new Error(`Failed to load job state from ${filePath}: ${error}`);
   }
diff --git a/src/lib/plan-state.ts b/src/lib/plan-state.ts
index 3dba026..a4921cc 100644
--- a/src/lib/plan-state.ts
+++ b/src/lib/plan-state.ts
@@ -33,7 +33,7 @@ export async function loadPlan(): Promise<PlanSpec | null> {
     return PlanSpecSchema.parse(parsed);
   } catch (error) {
     if (error instanceof z.ZodError) {
-      throw new Error(`Invalid plan state in ${filePath}: ${error.errors.map(e => `${e.path.join('.')}: ${e.message}`).join(', ')}`);
+      throw new Error(`Invalid plan state in ${filePath}: ${error.issues.map(e => `${e.path.join('.')}: ${e.message}`).join(', ')}`);
     }
     throw new Error(`Failed to load plan state from ${filePath}: ${error}`);
   }