diff --git a/keystore2/aidl/Android.bp b/keystore2/aidl/Android.bp
index 8f5c13b..c297a15 100644
--- a/keystore2/aidl/Android.bp
+++ b/keystore2/aidl/Android.bp
@@ -23,8 +23,8 @@
 
 aidl_interface {
     name: "android.security.attestationmanager",
-    srcs: [ "android/security/attestationmanager/*.aidl", ],
-    imports: [ "android.hardware.security.keymint-V3" ],
+    srcs: ["android/security/attestationmanager/*.aidl"],
+    imports: ["android.hardware.security.keymint-V3"],
     unstable: true,
     backend: {
         java: {
@@ -36,13 +36,13 @@
         ndk: {
             enabled: true,
             apps_enabled: false,
-        }
+        },
     },
 }
 
 aidl_interface {
     name: "android.security.authorization",
-    srcs: [ "android/security/authorization/*.aidl" ],
+    srcs: ["android/security/authorization/*.aidl"],
     imports: [
         "android.hardware.security.keymint-V3",
         "android.hardware.security.secureclock-V1",
@@ -58,13 +58,13 @@
         ndk: {
             enabled: true,
             apps_enabled: false,
-        }
+        },
     },
 }
 
 aidl_interface {
     name: "android.security.apc",
-    srcs: [ "android/security/apc/*.aidl" ],
+    srcs: ["android/security/apc/*.aidl"],
     unstable: true,
     backend: {
         java: {
@@ -75,13 +75,13 @@
         },
         ndk: {
             enabled: true,
-        }
+        },
     },
 }
 
 aidl_interface {
     name: "android.security.compat",
-    srcs: [ "android/security/compat/*.aidl" ],
+    srcs: ["android/security/compat/*.aidl"],
     imports: [
         "android.hardware.security.keymint-V3",
         "android.hardware.security.secureclock-V1",
@@ -104,9 +104,9 @@
 
 aidl_interface {
     name: "android.security.maintenance",
-    srcs: [ "android/security/maintenance/*.aidl" ],
+    srcs: ["android/security/maintenance/*.aidl"],
     imports: [
-        "android.system.keystore2-V3",
+        "android.system.keystore2-V4",
     ],
     unstable: true,
     backend: {
@@ -119,13 +119,13 @@
         ndk: {
             enabled: true,
             apps_enabled: false,
-        }
+        },
     },
 }
 
 aidl_interface {
     name: "android.security.legacykeystore",
-    srcs: [ "android/security/legacykeystore/*.aidl" ],
+    srcs: ["android/security/legacykeystore/*.aidl"],
     unstable: true,
     backend: {
         java: {
@@ -137,15 +137,15 @@
         ndk: {
             enabled: true,
             apps_enabled: false,
-        }
+        },
     },
 }
 
 aidl_interface {
     name: "android.security.metrics",
-    srcs: [ "android/security/metrics/*.aidl" ],
+    srcs: ["android/security/metrics/*.aidl"],
     imports: [
-        "android.system.keystore2-V3",
+        "android.system.keystore2-V4",
     ],
     unstable: true,
     backend: {
@@ -158,7 +158,7 @@
         ndk: {
             enabled: true,
             apps_enabled: false,
-        }
+        },
     },
 }
 
@@ -168,21 +168,21 @@
 java_defaults {
     name: "keystore2_use_latest_aidl_java_static",
     static_libs: [
-        "android.system.keystore2-V3-java-source"
+        "android.system.keystore2-V4-java-source",
     ],
 }
 
 java_defaults {
     name: "keystore2_use_latest_aidl_java_shared",
     libs: [
-        "android.system.keystore2-V3-java-source"
+        "android.system.keystore2-V4-java-source",
     ],
 }
 
 java_defaults {
     name: "keystore2_use_latest_aidl_java",
     libs: [
-        "android.system.keystore2-V3-java"
+        "android.system.keystore2-V4-java",
     ],
 }
 
@@ -192,38 +192,37 @@
 cc_defaults {
     name: "keystore2_use_latest_aidl_ndk_static",
     static_libs: [
-        "android.system.keystore2-V3-ndk",
+        "android.system.keystore2-V4-ndk",
     ],
 }
 
 cc_defaults {
     name: "keystore2_use_latest_aidl_ndk_shared",
     shared_libs: [
-        "android.system.keystore2-V3-ndk",
+        "android.system.keystore2-V4-ndk",
     ],
 }
 
 cc_defaults {
     name: "keystore2_use_latest_aidl_cpp_shared",
     shared_libs: [
-        "android.system.keystore2-V3-cpp",
+        "android.system.keystore2-V4-cpp",
     ],
 }
 
 cc_defaults {
     name: "keystore2_use_latest_aidl_cpp_static",
     static_libs: [
-        "android.system.keystore2-V3-cpp",
+        "android.system.keystore2-V4-cpp",
     ],
 }
 
-
 // A rust_defaults that includes the latest Keystore2 AIDL library.
 // Modules that depend on Keystore2 directly can include this rust_defaults to avoid
 // managing dependency versions explicitly.
 rust_defaults {
     name: "keystore2_use_latest_aidl_rust",
     rustlibs: [
-        "android.system.keystore2-V3-rust",
+        "android.system.keystore2-V4-rust",
     ],
 }
diff --git a/keystore2/android.system.keystore2-service.xml b/keystore2/android.system.keystore2-service.xml
index 45f995c..4d8a756 100644
--- a/keystore2/android.system.keystore2-service.xml
+++ b/keystore2/android.system.keystore2-service.xml
@@ -1,7 +1,7 @@
 <manifest version="1.0" type="framework">
     <hal format="aidl">
         <name>android.system.keystore2</name>
-        <version>3</version>
+        <version>4</version>
         <interface>
             <name>IKeystoreService</name>
             <instance>default</instance>
diff --git a/keystore2/test_utils/Android.bp b/keystore2/test_utils/Android.bp
index e37ba60..602c98c 100644
--- a/keystore2/test_utils/Android.bp
+++ b/keystore2/test_utils/Android.bp
@@ -46,7 +46,7 @@
         "libkeystore-engine",
     ],
     shared_libs: [
-        "android.system.keystore2-V3-ndk",
+        "android.system.keystore2-V4-ndk",
         "libbase",
         "libcrypto",
         "libkeymaster_portable",