diff --git a/manifest.gradle b/manifest.gradle
index 2d8031e1..dc4f041b 100644
--- a/manifest.gradle
+++ b/manifest.gradle
@@ -9,8 +9,8 @@ ext {
     library_licenses = ["Apache-2.0"]
     library_licenses_url = 'https://www.apache.org/licenses/LICENSE-2.0.txt'
     library_project_group = 'net.gotev'
-    library_version = '4.9.0'
-    version_code = 49
+    library_version = '4.9.1'
+    version_code = 50
     min_sdk = 21
     target_sdk = 34
     demo_app_id = 'net.gotev.uploadservicedemo'
diff --git a/uploadservice-ftp/build.gradle b/uploadservice-ftp/build.gradle
index de824f83..5c52225d 100644
--- a/uploadservice-ftp/build.gradle
+++ b/uploadservice-ftp/build.gradle
@@ -29,6 +29,7 @@ android {
         versionCode version_code
         versionName library_version
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles 'proguard-rules.pro'
     }
 
     buildTypes {
diff --git a/uploadservice-ftp/proguard-rules.pro b/uploadservice-ftp/proguard-rules.pro
index 4d9879af..567f5a4e 100644
--- a/uploadservice-ftp/proguard-rules.pro
+++ b/uploadservice-ftp/proguard-rules.pro
@@ -1,17 +1 @@
-# Add project specific ProGuard rules here.
-# By default, the flags in this file are appended to flags specified
-# in /Users/alex/workspace/sdk/tools/proguard/proguard-android.txt
-# You can edit the include path and order by changing the proguardFiles
-# directive in build.gradle.
-#
-# For more details, see
-#   http://developer.android.com/guide/developing/tools/proguard.html
-
-# Add any project specific keep options here:
-
-# If your project uses WebView with JS, uncomment the following
-# and specify the fully qualified class name to the JavaScript interface
-# class:
-#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
-#   public *;
-#}
+-keep class net.gotev.uploadservice.ftp.** { *; }
diff --git a/uploadservice-okhttp/build.gradle b/uploadservice-okhttp/build.gradle
index e92bab6b..ddef149f 100644
--- a/uploadservice-okhttp/build.gradle
+++ b/uploadservice-okhttp/build.gradle
@@ -29,6 +29,7 @@ android {
         versionCode version_code
         versionName library_version
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles 'proguard-rules.pro'
     }
 
     buildTypes {
diff --git a/uploadservice-okhttp/proguard-rules.pro b/uploadservice-okhttp/proguard-rules.pro
index 4d9879af..8546c622 100644
--- a/uploadservice-okhttp/proguard-rules.pro
+++ b/uploadservice-okhttp/proguard-rules.pro
@@ -1,17 +1 @@
-# Add project specific ProGuard rules here.
-# By default, the flags in this file are appended to flags specified
-# in /Users/alex/workspace/sdk/tools/proguard/proguard-android.txt
-# You can edit the include path and order by changing the proguardFiles
-# directive in build.gradle.
-#
-# For more details, see
-#   http://developer.android.com/guide/developing/tools/proguard.html
-
-# Add any project specific keep options here:
-
-# If your project uses WebView with JS, uncomment the following
-# and specify the fully qualified class name to the JavaScript interface
-# class:
-#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
-#   public *;
-#}
+-keep class net.gotev.uploadservice.okhttp.** { *; }
diff --git a/uploadservice/build.gradle b/uploadservice/build.gradle
index e23a3962..996750b3 100644
--- a/uploadservice/build.gradle
+++ b/uploadservice/build.gradle
@@ -36,6 +36,7 @@ android {
         buildConfigField 'String', 'VERSION_NAME', "\"$library_version\""
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles 'proguard-rules.pro'
     }
 
     buildTypes {
diff --git a/uploadservice/proguard-rules.pro b/uploadservice/proguard-rules.pro
index 4d9879af..ffddb80e 100644
--- a/uploadservice/proguard-rules.pro
+++ b/uploadservice/proguard-rules.pro
@@ -1,17 +1 @@
-# Add project specific ProGuard rules here.
-# By default, the flags in this file are appended to flags specified
-# in /Users/alex/workspace/sdk/tools/proguard/proguard-android.txt
-# You can edit the include path and order by changing the proguardFiles
-# directive in build.gradle.
-#
-# For more details, see
-#   http://developer.android.com/guide/developing/tools/proguard.html
-
-# Add any project specific keep options here:
-
-# If your project uses WebView with JS, uncomment the following
-# and specify the fully qualified class name to the JavaScript interface
-# class:
-#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
-#   public *;
-#}
+-keep class net.gotev.uploadservice.** { *; }