diff --git a/app/src/main/java/org/matrix/TEESimulator/App.kt b/app/src/main/java/org/matrix/TEESimulator/App.kt
index b694cbe..d8230e0 100644
--- a/app/src/main/java/org/matrix/TEESimulator/App.kt
+++ b/app/src/main/java/org/matrix/TEESimulator/App.kt
@@ -10,6 +10,7 @@ import java.security.Security
 import org.bouncycastle.jce.provider.BouncyCastleProvider
 import org.matrix.TEESimulator.config.BootStateManager
 import org.matrix.TEESimulator.config.ConfigurationManager
+import org.matrix.TEESimulator.config.PatchLevelManager
 import org.matrix.TEESimulator.interception.keystore.AbstractKeystoreInterceptor
 import org.matrix.TEESimulator.interception.keystore.Keystore2Interceptor
 import org.matrix.TEESimulator.interception.keystore.KeystoreInterceptor
@@ -46,6 +47,7 @@ object App {
             // Load the package configuration.
             ConfigurationManager.initialize()
             BootStateManager.apply()
+            PatchLevelManager.initialize()
             // Set up the device's boot key and hash, which are crucial for attestation.
             AndroidDeviceUtils.setupBootKeyAndHash()
 
diff --git a/app/src/main/java/org/matrix/TEESimulator/config/PatchLevelManager.kt b/app/src/main/java/org/matrix/TEESimulator/config/PatchLevelManager.kt
new file mode 100644
index 0000000..6a7a215
--- /dev/null
+++ b/app/src/main/java/org/matrix/TEESimulator/config/PatchLevelManager.kt
@@ -0,0 +1,97 @@
+package org.matrix.TEESimulator.config
+
+import android.os.Build
+import android.os.SystemProperties
+import java.io.File
+import java.nio.file.Files
+import java.nio.file.StandardCopyOption
+import java.time.LocalDate
+import org.json.JSONObject
+import org.matrix.TEESimulator.logging.SystemLogger
+import org.matrix.TEESimulator.util.AndroidDeviceUtils
+
+object PatchLevelManager {
+    private const val PATCH_FILE = "/data/adb/tricky_store/security_patch.txt"
+    private const val STAGING_FILE = "/data/adb/tricky_store/security_patch.txt.next"
+    private const val FLOOR_YYYYMMDD = 20200101
+    private const val MAX_PAST_OFFSET = 10000
+
+    private val DATE_PATTERN = Regex("^\\d{4}-\\d{2}-\\d{2}$")
+    private val PROP_PATTERN = Regex("^SECURITY_PATCH=(.+)$", RegexOption.MULTILINE)
+
+    private val PIF_SOURCES =
+        listOf(
+            "/data/adb/modules/playintegrityfix/pif.json",
+            "/data/adb/pif.json",
+            "/data/adb/modules/playintegrityfix/pif.prop",
+            "/data/adb/pif.prop",
+            "/data/adb/modules/playintegrityfix/custom.pif.json",
+            "/data/adb/modules/playintegrityfix/custom.pif.prop",
+        )
+
+    fun initialize() {
+        val date =
+            resolvePifPatch()
+                ?: SystemProperties.get(
+                    "ro.build.version.security_patch",
+                    Build.VERSION.SECURITY_PATCH,
+                )
+        SystemLogger.info("PatchLevelManager: resolved patch date = $date")
+        updateTo(date)
+    }
+
+    fun updateTo(date: String) {
+        if (!DATE_PATTERN.matches(date)) {
+            SystemLogger.warning("PatchLevelManager: invalid date format: $date")
+            return
+        }
+        val dateInt = date.replace("-", "").toInt()
+        if (dateInt < FLOOR_YYYYMMDD) {
+            SystemLogger.warning("PatchLevelManager: $date below floor $FLOOR_YYYYMMDD")
+            return
+        }
+        val today =
+            LocalDate.now().let { it.year * 10000 + it.monthValue * 100 + it.dayOfMonth }
+        if (today >= dateInt + MAX_PAST_OFFSET) {
+            SystemLogger.warning(
+                "PatchLevelManager: $date more than 1y older than today ($today)"
+            )
+            return
+        }
+        atomicWrite(date)
+        AndroidDeviceUtils.setProperty("ro.build.version.security_patch", date)
+        AndroidDeviceUtils.setProperty("ro.vendor.build.security_patch", date)
+        SystemLogger.info("PatchLevelManager: applied patch date $date")
+    }
+
+    private fun resolvePifPatch(): String? {
+        val source = PIF_SOURCES.map(::File).lastOrNull { it.exists() } ?: return null
+        return try {
+            val text = source.readText()
+            val parsed =
+                if (source.name.endsWith(".json")) {
+                    JSONObject(text).optString("SECURITY_PATCH", "")
+                } else {
+                    PROP_PATTERN.find(text)?.groupValues?.get(1)?.trim().orEmpty()
+                }
+            parsed.takeIf { it.isNotBlank() }
+        } catch (e: Exception) {
+            SystemLogger.warning(
+                "PatchLevelManager: failed to parse ${source.path}: ${e.message}"
+            )
+            null
+        }
+    }
+
+    private fun atomicWrite(date: String) {
+        val target = File(PATCH_FILE)
+        val staging = File(STAGING_FILE)
+        staging.writeText("system=$date\nboot=$date\nvendor=$date\n")
+        Files.move(
+            staging.toPath(),
+            target.toPath(),
+            StandardCopyOption.ATOMIC_MOVE,
+            StandardCopyOption.REPLACE_EXISTING,
+        )
+    }
+}