diff --git a/src/adb/AdbProvider.test.ts b/src/adb/AdbProvider.test.ts
index 8615e4cdf1..77a460a94c 100644
--- a/src/adb/AdbProvider.test.ts
+++ b/src/adb/AdbProvider.test.ts
@@ -709,7 +709,7 @@ it("projects package details from dumpsys package output", async () => {
   });
   expect(result).toMatchObject({
     version_name: "1.2.3",
-    version_code: 45,
+    version_code: "45",
     first_install_time: "2026-01-02 03:04:05",
     last_update_time: "2026-02-03 04:05:06",
     installer_package_name: "com.android.vending",
@@ -719,6 +719,30 @@ it("projects package details from dumpsys package output", async () => {
   });
 });
 
+// PackageInfo.getLongVersionCode() combines versionCodeMajor and versionCode
+// into a signed 64-bit long, which JSON numbers cannot hold exactly.
+it.each(["9007199254740993", "-4294967296"])(
+  "keeps the long version code %s exactly as dumpsys prints it",
+  async (versionCode) => {
+    const { binary } = await writeAdbStub(
+      shellStub({
+        "dumpsys:package": `Packages:
+  Package [com.example] (abcdef):
+    versionCode=${versionCode} minSdk=24 targetSdk=34
+`,
+      }),
+    );
+    const result = await evidenceResult(providerOver(binary), {
+      operation: "inspect_adb_package",
+      input: { serial: "emulator-5554", package: "com.example" },
+    });
+    expect(result).toMatchObject({
+      version_code: versionCode,
+      coverage: "complete",
+    });
+  },
+);
+
 // Android 10 and 11 append ": restricted=true" to hard- and soft-restricted
 // entries of the requested-permissions list (Settings.dumpPackageLPr).
 it("counts requested permissions that the device marks as restricted", async () => {
diff --git a/src/adb/AdbShellOutput.ts b/src/adb/AdbShellOutput.ts
index 70a1584a22..90ed6f99d9 100644
--- a/src/adb/AdbShellOutput.ts
+++ b/src/adb/AdbShellOutput.ts
@@ -193,7 +193,8 @@ export const parseWindowFocusOutput = (
 
 export interface AdbPackageDetails {
   readonly versionName: string | null;
-  readonly versionCode: number | null;
+  /** Signed 64-bit long version code exactly as Package Manager prints it. */
+  readonly versionCode: string | null;
   readonly firstInstallTime: string | null;
   readonly lastUpdateTime: string | null;
   readonly installerPackageName: string | null;
@@ -214,7 +215,7 @@ export const parseDumpsysPackageOutput = (
 ): AdbPackageDetails => {
   const details: {
     versionName: string | null;
-    versionCode: number | null;
+    versionCode: string | null;
     firstInstallTime: string | null;
     lastUpdateTime: string | null;
     installerPackageName: string | null;
@@ -252,8 +253,8 @@ export const parseDumpsysPackageOutput = (
     if (key === "versionName" && details.versionName === null)
       details.versionName = value === "" ? null : value;
     else if (key === "versionCode" && details.versionCode === null) {
-      const parsed = /^(\d+)/u.exec(value);
-      if (parsed !== null) details.versionCode = Number(parsed[1]!);
+      const parsed = /^(-?\d+)/u.exec(value);
+      if (parsed !== null) details.versionCode = parsed[1]!;
     } else if (key === "firstInstallTime" && details.firstInstallTime === null)
       details.firstInstallTime = value === "" ? null : value;
     else if (key === "lastUpdateTime" && details.lastUpdateTime === null)
diff --git a/src/domain/adb/adbDeviceAnalysis.ts b/src/domain/adb/adbDeviceAnalysis.ts
index ca6cf78e58..e5b14b8ee1 100644
--- a/src/domain/adb/adbDeviceAnalysis.ts
+++ b/src/domain/adb/adbDeviceAnalysis.ts
@@ -527,7 +527,13 @@ export const adbResultSchemas = {
     serial: z.string().min(1),
     package_name: packageNameSchema,
     version_name: z.string().nullable(),
-    version_code: z.number().int().nullable(),
+    version_code: z
+      .string()
+      .regex(/^-?\d+$/u)
+      .nullable()
+      .describe(
+        "Long version code exactly as dumpsys package prints it; may exceed the JSON safe-integer range",
+      ),
     first_install_time: z.string().nullable(),
     last_update_time: z.string().nullable(),
     installer_package_name: z.string().nullable(),
diff --git a/tests/boundary/mcp/adbMcp.test.ts b/tests/boundary/mcp/adbMcp.test.ts
index 656855dd0e..61af5378fe 100644
--- a/tests/boundary/mcp/adbMcp.test.ts
+++ b/tests/boundary/mcp/adbMcp.test.ts
@@ -94,7 +94,7 @@ const results: Readonly<Record<string, unknown>> = {
     serial: "emulator-5554",
     package_name: "com.example",
     version_name: "1.2.3",
-    version_code: 45,
+    version_code: "45",
     first_install_time: "2026-01-02 03:04:05",
     last_update_time: "2026-02-03 04:05:06",
     installer_package_name: null,