diff --git a/app/build.gradle b/app/build.gradle
index eb2973e..5fa3dc8 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -27,7 +27,8 @@ android {
 
     buildTypes {
         release {
-            minifyEnabled false
+            minifyEnabled true
+            shrinkResources true
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
             buildConfigField "Integer", "DB_VERSION", "1"
             buildConfigField "Boolean", "TEST", "false"
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index fe36868..306b486 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -8,12 +8,6 @@
     <uses-permission
         android:name="android.permission.CAMERA"
         tools:node="remove" />
-    <uses-permission
-        android:name="android.permission.READ_PHONE_STATE"
-        tools:node="remove" />
-    <uses-permission
-        android:name="android.permission.INTERNET"
-        tools:node="remove" />
 
     <application
         android:allowBackup="false"
diff --git a/app/src/main/java/fr/sanchezm/attestationsCovid19/data/db/MyDatabase.kt b/app/src/main/java/fr/sanchezm/attestationsCovid19/data/db/MyDatabase.kt
index f113f15..28ff7ed 100644
--- a/app/src/main/java/fr/sanchezm/attestationsCovid19/data/db/MyDatabase.kt
+++ b/app/src/main/java/fr/sanchezm/attestationsCovid19/data/db/MyDatabase.kt
@@ -2,18 +2,22 @@ package fr.sanchezm.attestationsCovid19.data.db
 
 import android.content.Context
 import fr.sanchezm.attestationsCovid19.data.db.dao.AttestationDao
+import fr.sanchezm.attestationsCovid19.data.db.dao.ConfigDao
 import fr.sanchezm.attestationsCovid19.data.db.dao.ProfileDao
 
 class MyDatabase private constructor(private val savePath: String, private val filesPath: String) {
 
     private var _profileDao: ProfileDao? = null
     private var _attestationDao: AttestationDao? = null
+    private var _configDao: ConfigDao? = null
 
     fun profileDao(): ProfileDao = _profileDao ?: ProfileDao(savePath).also { _profileDao = it }
 
     fun attestationDao(): AttestationDao =
         _attestationDao ?: AttestationDao(savePath, filesPath).also { _attestationDao = it }
 
+    fun configDao(): ConfigDao = _configDao ?: ConfigDao(savePath).also { _configDao = it }
+
     companion object {
         @Volatile
         private var instance: MyDatabase? = null
diff --git a/app/src/main/java/fr/sanchezm/attestationsCovid19/data/db/dao/AttestationDao.kt b/app/src/main/java/fr/sanchezm/attestationsCovid19/data/db/dao/AttestationDao.kt
index 8fc78b6..417f7ef 100644
--- a/app/src/main/java/fr/sanchezm/attestationsCovid19/data/db/dao/AttestationDao.kt
+++ b/app/src/main/java/fr/sanchezm/attestationsCovid19/data/db/dao/AttestationDao.kt
@@ -11,8 +11,8 @@ import java.io.File
 
 class AttestationDao(private val savePath: String, private val filesPath: String) {
 
-    private var _attestations = MutableLiveData<ArrayList<Attestation>>()
-    private var fileName = "attestation.db"
+    private val _attestations = MutableLiveData<ArrayList<Attestation>>()
+    private val fileName = "attestation.db"
     private val type = object : TypeToken<ArrayList<Attestation>>() {}.type
 
     @Suppress("UNCHECKED_CAST")
diff --git a/app/src/main/java/fr/sanchezm/attestationsCovid19/data/db/dao/ConfigDao.kt b/app/src/main/java/fr/sanchezm/attestationsCovid19/data/db/dao/ConfigDao.kt
new file mode 100644
index 0000000..eef99b9
--- /dev/null
+++ b/app/src/main/java/fr/sanchezm/attestationsCovid19/data/db/dao/ConfigDao.kt
@@ -0,0 +1,45 @@
+package fr.sanchezm.attestationsCovid19.data.db.dao
+
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import com.google.gson.Gson
+import fr.sanchezm.attestationsCovid19.BuildConfig
+import fr.sanchezm.attestationsCovid19.data.db.entity.Config
+import java.io.File
+
+class ConfigDao(private val savePath: String) {
+
+    private val _config = MutableLiveData<Config>()
+    private val fileName = "config.db"
+
+    fun getConfig(): LiveData<Config> =
+        _config
+
+    fun updateConfig(config: Config) {
+        _config.value = config
+        save()
+    }
+
+    init {
+        load()
+    }
+
+    private fun load() {
+        val file = File("$savePath/$fileName")
+
+        if (file.exists()) {
+            _config.value = Gson().fromJson(file.readText(Charsets.UTF_8), Config::class.java)
+            _config.value?.versionCode = BuildConfig.VERSION_CODE
+            _config.value?.versionName = BuildConfig.VERSION_NAME
+        } else {
+            _config.value =
+                Config(BuildConfig.DB_VERSION, BuildConfig.VERSION_NAME, BuildConfig.VERSION_CODE)
+            save()
+        }
+    }
+
+    private fun save() {
+        File("$savePath/$fileName").writeText(Gson().toJson(_config.value))
+    }
+
+}
\ No newline at end of file
diff --git a/app/src/main/java/fr/sanchezm/attestationsCovid19/data/db/dao/ProfileDao.kt b/app/src/main/java/fr/sanchezm/attestationsCovid19/data/db/dao/ProfileDao.kt
index d285a5d..c152df5 100644
--- a/app/src/main/java/fr/sanchezm/attestationsCovid19/data/db/dao/ProfileDao.kt
+++ b/app/src/main/java/fr/sanchezm/attestationsCovid19/data/db/dao/ProfileDao.kt
@@ -8,8 +8,8 @@ import java.io.File
 
 class ProfileDao(private val path: String) {
 
-    private var _profile = MutableLiveData<Profile>()
-    private var fileName = "profile.db"
+    private val _profile = MutableLiveData<Profile>()
+    private val fileName = "profile.db"
 
     fun getProfile(): LiveData<Profile> =
         _profile
diff --git a/app/src/main/java/fr/sanchezm/attestationsCovid19/data/db/entity/Config.kt b/app/src/main/java/fr/sanchezm/attestationsCovid19/data/db/entity/Config.kt
new file mode 100644
index 0000000..3f479d2
--- /dev/null
+++ b/app/src/main/java/fr/sanchezm/attestationsCovid19/data/db/entity/Config.kt
@@ -0,0 +1,7 @@
+package fr.sanchezm.attestationsCovid19.data.db.entity
+
+data class Config(
+    val dbVersion: Int,
+    var versionName: String,
+    var versionCode: Int
+)
\ No newline at end of file
diff --git a/app/src/main/java/fr/sanchezm/attestationsCovid19/data/repository/ConfigRepository.kt b/app/src/main/java/fr/sanchezm/attestationsCovid19/data/repository/ConfigRepository.kt
new file mode 100644
index 0000000..0c0ccfd
--- /dev/null
+++ b/app/src/main/java/fr/sanchezm/attestationsCovid19/data/repository/ConfigRepository.kt
@@ -0,0 +1,21 @@
+package fr.sanchezm.attestationsCovid19.data.repository
+
+import fr.sanchezm.attestationsCovid19.data.db.dao.ConfigDao
+import fr.sanchezm.attestationsCovid19.data.db.entity.Config
+
+class ConfigRepository private constructor(private val configDao: ConfigDao) {
+
+    fun getConfig() = configDao.getConfig()
+
+    fun updateConfig(config: Config) = configDao.updateConfig(config)
+
+    companion object {
+        @Volatile
+        private var instance: ConfigRepository? = null
+
+        fun getInstance(configDao: ConfigDao) =
+            instance ?: synchronized(this) {
+                instance ?: ConfigRepository(configDao).also { instance = it }
+            }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/fr/sanchezm/attestationsCovid19/ui/add/AddViewModel.kt b/app/src/main/java/fr/sanchezm/attestationsCovid19/ui/add/AddViewModel.kt
index b8249d8..2ad4498 100644
--- a/app/src/main/java/fr/sanchezm/attestationsCovid19/ui/add/AddViewModel.kt
+++ b/app/src/main/java/fr/sanchezm/attestationsCovid19/ui/add/AddViewModel.kt
@@ -10,6 +10,7 @@ import fr.sanchezm.attestationsCovid19.R
 import fr.sanchezm.attestationsCovid19.data.db.entity.Attestation
 import fr.sanchezm.attestationsCovid19.data.db.entity.Profile
 import fr.sanchezm.attestationsCovid19.data.repository.AttestationRepository
+import fr.sanchezm.attestationsCovid19.data.repository.ConfigRepository
 import fr.sanchezm.attestationsCovid19.data.repository.ProfileRepository
 import fr.sanchezm.attestationsCovid19.utilities.Event
 import java.text.SimpleDateFormat
@@ -18,6 +19,7 @@ import java.time.format.DateTimeFormatter
 import java.util.*
 
 class AddViewModel(
+    private val configRepository: ConfigRepository,
     private val profileRepository: ProfileRepository,
     private val attestationRepository: AttestationRepository
 ) : ViewModel() {
diff --git a/app/src/main/java/fr/sanchezm/attestationsCovid19/ui/add/AddViewModelFactory.kt b/app/src/main/java/fr/sanchezm/attestationsCovid19/ui/add/AddViewModelFactory.kt
index 5570fb7..34545e8 100644
--- a/app/src/main/java/fr/sanchezm/attestationsCovid19/ui/add/AddViewModelFactory.kt
+++ b/app/src/main/java/fr/sanchezm/attestationsCovid19/ui/add/AddViewModelFactory.kt
@@ -3,9 +3,11 @@ package fr.sanchezm.attestationsCovid19.ui.add
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.ViewModelProvider
 import fr.sanchezm.attestationsCovid19.data.repository.AttestationRepository
+import fr.sanchezm.attestationsCovid19.data.repository.ConfigRepository
 import fr.sanchezm.attestationsCovid19.data.repository.ProfileRepository
 
 class AddViewModelFactory(
+    private val configRepository: ConfigRepository,
     private val profileRepository: ProfileRepository,
     private val attestationRepository: AttestationRepository
 ) :
@@ -13,6 +15,6 @@ class AddViewModelFactory(
 
     @Suppress("UNCHECKED_CAST")
     override fun <T : ViewModel?> create(modelClass: Class<T>): T {
-        return AddViewModel(profileRepository, attestationRepository) as T
+        return AddViewModel(configRepository, profileRepository, attestationRepository) as T
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/fr/sanchezm/attestationsCovid19/ui/attestations/AttestationsViewModel.kt b/app/src/main/java/fr/sanchezm/attestationsCovid19/ui/attestations/AttestationsViewModel.kt
index 4a23ca4..1a240e1 100644
--- a/app/src/main/java/fr/sanchezm/attestationsCovid19/ui/attestations/AttestationsViewModel.kt
+++ b/app/src/main/java/fr/sanchezm/attestationsCovid19/ui/attestations/AttestationsViewModel.kt
@@ -5,9 +5,14 @@ import androidx.lifecycle.LiveData
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
 import fr.sanchezm.attestationsCovid19.data.repository.AttestationRepository
+import fr.sanchezm.attestationsCovid19.data.repository.ConfigRepository
 import fr.sanchezm.attestationsCovid19.utilities.Event
 
-class AttestationsViewModel(attestationRepository: AttestationRepository) : ViewModel() {
+class AttestationsViewModel(
+    private val configRepository: ConfigRepository,
+    attestationRepository: AttestationRepository
+) :
+    ViewModel() {
 
     private val _startActivity = MutableLiveData<Event<Long>>()
     private var _displayNoAttestation = MutableLiveData<Int>()
diff --git a/app/src/main/java/fr/sanchezm/attestationsCovid19/ui/attestations/AttestationsViewModelFactory.kt b/app/src/main/java/fr/sanchezm/attestationsCovid19/ui/attestations/AttestationsViewModelFactory.kt
index 913cb1b..ed05e45 100644
--- a/app/src/main/java/fr/sanchezm/attestationsCovid19/ui/attestations/AttestationsViewModelFactory.kt
+++ b/app/src/main/java/fr/sanchezm/attestationsCovid19/ui/attestations/AttestationsViewModelFactory.kt
@@ -3,13 +3,16 @@ package fr.sanchezm.attestationsCovid19.ui.attestations
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.ViewModelProvider
 import fr.sanchezm.attestationsCovid19.data.repository.AttestationRepository
-import fr.sanchezm.attestationsCovid19.data.repository.ProfileRepository
+import fr.sanchezm.attestationsCovid19.data.repository.ConfigRepository
 
-class AttestationsViewModelFactory(private val attestationRepository: AttestationRepository) :
+class AttestationsViewModelFactory(
+    private val configRepository: ConfigRepository,
+    private val attestationRepository: AttestationRepository
+) :
     ViewModelProvider.NewInstanceFactory() {
 
     @Suppress("UNCHECKED_CAST")
     override fun <T : ViewModel?> create(modelClass: Class<T>): T {
-        return AttestationsViewModel(attestationRepository) as T
+        return AttestationsViewModel(configRepository, attestationRepository) as T
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/fr/sanchezm/attestationsCovid19/ui/qrcode/QrCodeViewModel.kt b/app/src/main/java/fr/sanchezm/attestationsCovid19/ui/qrcode/QrCodeViewModel.kt
index 7a3e6b9..600c58d 100644
--- a/app/src/main/java/fr/sanchezm/attestationsCovid19/ui/qrcode/QrCodeViewModel.kt
+++ b/app/src/main/java/fr/sanchezm/attestationsCovid19/ui/qrcode/QrCodeViewModel.kt
@@ -7,10 +7,15 @@ import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
 import fr.sanchezm.attestationsCovid19.data.db.entity.Attestation
 import fr.sanchezm.attestationsCovid19.data.repository.AttestationRepository
+import fr.sanchezm.attestationsCovid19.data.repository.ConfigRepository
 import fr.sanchezm.attestationsCovid19.utilities.Event
 import fr.sanchezm.attestationsCovid19.utilities.QRCodeUtils
 
-class QrCodeViewModel(private val attestationRepository: AttestationRepository) : ViewModel() {
+class QrCodeViewModel(
+    private val configRepository: ConfigRepository,
+    private val attestationRepository: AttestationRepository
+) :
+    ViewModel() {
 
     private val _attestation = MutableLiveData<Attestation>()
 
diff --git a/app/src/main/java/fr/sanchezm/attestationsCovid19/ui/qrcode/QrCodeViewModelFactory.kt b/app/src/main/java/fr/sanchezm/attestationsCovid19/ui/qrcode/QrCodeViewModelFactory.kt
index 18f4395..98bc5bd 100644
--- a/app/src/main/java/fr/sanchezm/attestationsCovid19/ui/qrcode/QrCodeViewModelFactory.kt
+++ b/app/src/main/java/fr/sanchezm/attestationsCovid19/ui/qrcode/QrCodeViewModelFactory.kt
@@ -3,12 +3,16 @@ package fr.sanchezm.attestationsCovid19.ui.qrcode
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.ViewModelProvider
 import fr.sanchezm.attestationsCovid19.data.repository.AttestationRepository
+import fr.sanchezm.attestationsCovid19.data.repository.ConfigRepository
 
-class QrCodeViewModelFactory(private val attestationRepository: AttestationRepository) :
+class QrCodeViewModelFactory(
+    private val configRepository: ConfigRepository,
+    private val attestationRepository: AttestationRepository
+) :
     ViewModelProvider.NewInstanceFactory() {
 
     @Suppress("UNCHECKED_CAST")
     override fun <T : ViewModel?> create(modelClass: Class<T>): T {
-        return QrCodeViewModel(attestationRepository) as T
+        return QrCodeViewModel(configRepository, attestationRepository) as T
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/fr/sanchezm/attestationsCovid19/utilities/InjectorUtils.kt b/app/src/main/java/fr/sanchezm/attestationsCovid19/utilities/InjectorUtils.kt
index 0da4f76..9e0f85d 100644
--- a/app/src/main/java/fr/sanchezm/attestationsCovid19/utilities/InjectorUtils.kt
+++ b/app/src/main/java/fr/sanchezm/attestationsCovid19/utilities/InjectorUtils.kt
@@ -4,6 +4,7 @@ import android.content.Context
 import android.os.Environment
 import fr.sanchezm.attestationsCovid19.data.db.MyDatabase
 import fr.sanchezm.attestationsCovid19.data.repository.AttestationRepository
+import fr.sanchezm.attestationsCovid19.data.repository.ConfigRepository
 import fr.sanchezm.attestationsCovid19.data.repository.ProfileRepository
 import fr.sanchezm.attestationsCovid19.ui.add.AddViewModelFactory
 import fr.sanchezm.attestationsCovid19.ui.attestations.AttestationsViewModelFactory
@@ -11,41 +12,42 @@ import fr.sanchezm.attestationsCovid19.ui.qrcode.QrCodeViewModelFactory
 
 object InjectorUtils {
 
-    fun provideAddViewModelFactory(context: Context): AddViewModelFactory {
-        val profileRepository =
-            ProfileRepository.getInstance(
-                MyDatabase.invoke(context, getMyFilesDir(context)).profileDao()
-            )
-        val attestationRepository =
-            AttestationRepository.getInstance(
-                MyDatabase.invoke(context, getMyFilesDir(context)).attestationDao()
-            )
+    fun provideAddViewModelFactory(context: Context): AddViewModelFactory =
+        AddViewModelFactory(
+            getConfigRepo(context),
+            getProfileRepo(context),
+            getAttestationRepo(context)
+        )
 
-        return AddViewModelFactory(profileRepository, attestationRepository)
-    }
+    fun provideAttestationViewModel(context: Context): AttestationsViewModelFactory =
+        AttestationsViewModelFactory(
+            getConfigRepo(context),
+            getAttestationRepo(context)
+        )
 
-    fun provideAttestationViewModel(context: Context): AttestationsViewModelFactory {
-        val attestationRepository =
-            AttestationRepository.getInstance(
-                MyDatabase.invoke(context, getMyFilesDir(context)).attestationDao()
-            )
+    fun provideQrCodeViewModel(context: Context): QrCodeViewModelFactory =
+        QrCodeViewModelFactory(
+            getConfigRepo(context),
+            getAttestationRepo(context)
+        )
 
-        return AttestationsViewModelFactory(attestationRepository)
-    }
+    fun providePdfUtils(context: Context): PdfUtils =
+        PdfUtils.getInstance(context.assets, getMyFilesDir(context))
 
-    fun provideQrCodeViewModel(context: Context): QrCodeViewModelFactory {
-        val attestationRepository =
-            AttestationRepository.getInstance(
-                MyDatabase.invoke(context, getMyFilesDir(context)).attestationDao()
-            )
+    private fun getMyFilesDir(context: Context): String =
+        context.getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS)?.path!!
 
-        return QrCodeViewModelFactory(attestationRepository)
-    }
+    private fun getAttestationRepo(context: Context): AttestationRepository =
+        AttestationRepository.getInstance(
+            MyDatabase.invoke(context, getMyFilesDir(context)).attestationDao()
+        )
 
-    fun providePdfUtils(context: Context): PdfUtils {
-        return PdfUtils.getInstance(context.assets, getMyFilesDir(context))
-    }
+    private fun getProfileRepo(context: Context): ProfileRepository = ProfileRepository.getInstance(
+        MyDatabase.invoke(context, getMyFilesDir(context)).profileDao()
+    )
 
-    private fun getMyFilesDir(context: Context): String = context.getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS)?.path!!
+    private fun getConfigRepo(context: Context): ConfigRepository = ConfigRepository.getInstance(
+        MyDatabase.invoke(context, getMyFilesDir(context)).configDao()
+    )
 
 }
\ No newline at end of file
diff --git a/app/src/main/res/mipmap-hdpi/ic_launcher.png b/app/src/main/res/mipmap-hdpi/ic_launcher.png
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diff --git a/app/src/main/res/mipmap-hdpi/ic_launcher_round.png b/app/src/main/res/mipmap-hdpi/ic_launcher_round.png
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diff --git a/app/src/main/res/mipmap-mdpi/ic_launcher.png b/app/src/main/res/mipmap-mdpi/ic_launcher.png
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diff --git a/app/src/main/res/mipmap-mdpi/ic_launcher_round.png b/app/src/main/res/mipmap-mdpi/ic_launcher_round.png
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diff --git a/app/src/main/res/mipmap-mdpi/ic_launcher_round.webp b/app/src/main/res/mipmap-mdpi/ic_launcher_round.webp
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diff --git a/app/src/main/res/mipmap-xhdpi/ic_launcher.png b/app/src/main/res/mipmap-xhdpi/ic_launcher.png
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