diff --git a/CHANGELOG.md b/CHANGELOG.md
index 24267da..ecd92ed 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,12 +18,15 @@
     [malware protection](https://uploadcare.com/docs/security/malware-protection/),
     and [background removal](https://uploadcare.com/docs/remove-bg/).
   - Fixed authorization signature for requests with url parameters.
+  - Added Proguard rule to keep DTO classes to avoid issues with network JSON deserialization.
 - Widget:
   - SocialApi doesn't use `GET /sources` method anymore.
+  - Added Proguard rule to keep DTO classes to avoid issues with network JSON deserialization.
 - Project:
   - Migrated Gradle builds from Groovy to Kotlin.
 - Example:
   - Removed sorting options by file size from `UploadFragment`.
+  - Enable R8 shrinking code for release build to enable Proguard's rules.
 
 ## 3.3.0
 - Library:
diff --git a/build.gradle.kts b/build.gradle.kts
index cd475c1..4251bd4 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -3,6 +3,7 @@
 buildscript {
     repositories {
         maven(url = "https://maven.google.com")
+        maven(url = "https://storage.googleapis.com/r8-releases/raw")
         google()
         mavenCentral()
     }
@@ -12,6 +13,10 @@ buildscript {
         classpath("com.android.tools.build:gradle:${libs.versions.gradleVersion.get()}")
         classpath(libs.kotlin.plugin)
         classpath(libs.navigation.safe.args.plugin)
+
+        // Required to support for sealed classes until AGP 8.2
+        // https://issuetracker.google.com/issues/227160052#comment37
+        classpath(libs.tools.r8)
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
     }
diff --git a/example/build.gradle.kts b/example/build.gradle.kts
index 7b8993d..9ab9adc 100644
--- a/example/build.gradle.kts
+++ b/example/build.gradle.kts
@@ -24,7 +24,7 @@ android {
 
     buildTypes {
         release {
-            isMinifyEnabled = false
+            isMinifyEnabled = true
             proguardFiles(getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro")
         }
     }
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 60552c0..0551a9f 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -24,6 +24,7 @@ moshi = "1.15.0"
 junit = "4.13.2"
 testRunner = "1.5.2"
 espressoCore = "3.5.1"
+r8 = "8.2.36"
 
 [libraries]
 kotlin-plugin = { group = "org.jetbrains.kotlin", name = "kotlin-gradle-plugin", version.ref = "kotlinVersion" }
@@ -67,3 +68,5 @@ preference-ktx = { group = "androidx.preference", name = "preference-ktx", versi
 test-runner = { group = "androidx.test", name = "runner", version.ref = "testRunner" }
 test-espresso-core = { group = "androidx.test.espresso", name = "espresso-core", version.ref = "espressoCore" }
 test-junit = { group = "junit", name = "junit", version.ref = "junit" }
+
+tools-r8 = { module = "com.android.tools:r8", version.ref = "r8" }
diff --git a/library/build.gradle.kts b/library/build.gradle.kts
index c1c5d9b..d45baeb 100644
--- a/library/build.gradle.kts
+++ b/library/build.gradle.kts
@@ -19,8 +19,9 @@ android {
 
     buildTypes {
         release {
-            isMinifyEnabled = false
+            isMinifyEnabled = true
             proguardFiles(getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro")
+            consumerProguardFile("proguard-rules.pro")
         }
     }
     packaging {
diff --git a/library/proguard-rules.pro b/library/proguard-rules.pro
index 137bfc5..ce997ea 100644
--- a/library/proguard-rules.pro
+++ b/library/proguard-rules.pro
@@ -15,3 +15,12 @@
 #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
 #   public *;
 #}
+
+-dontwarn java.lang.invoke.StringConcatFactory
+
+-keep class com.uploadcare.android.library.data.** { *; }
+-keep class com.uploadcare.android.library.api.Project { *; }
+-keep class com.uploadcare.android.library.api.UploadcareCopyFile { *; }
+-keep class com.uploadcare.android.library.api.UploadcareFile { *; }
+-keep class com.uploadcare.android.library.api.UploadcareGroup { *; }
+-keep class com.uploadcare.android.library.api.UploadcareWebhook { *; }
diff --git a/widget/build.gradle.kts b/widget/build.gradle.kts
index fffe961..ca8ead0 100644
--- a/widget/build.gradle.kts
+++ b/widget/build.gradle.kts
@@ -27,9 +27,10 @@ android {
             buildConfigField("String", "SOCIAL_API_ENDPOINT", "\"https://social.uploadcare.com/\"")
         }
         release {
-            isMinifyEnabled = false
+            isMinifyEnabled = true
             buildConfigField("String", "SOCIAL_API_ENDPOINT", "\"https://social.uploadcare.com/\"")
             proguardFiles(getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro")
+            consumerProguardFile("proguard-rules.pro")
         }
     }
 
diff --git a/widget/proguard-rules.pro b/widget/proguard-rules.pro
index 137bfc5..8848c9f 100644
--- a/widget/proguard-rules.pro
+++ b/widget/proguard-rules.pro
@@ -15,3 +15,21 @@
 #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
 #   public *;
 #}
+
+-keep class com.uploadcare.android.widget.data.** { *; }
+
+# Keep inherited services.
+-if interface * { @retrofit2.http.* <methods>; }
+-keep,allowobfuscation interface * extends <1>
+
+# With R8 full mode generic signatures are stripped for classes that are not
+# kept. Suspend functions are wrapped in continuations where the type argument
+# is used.
+-keep,allowobfuscation,allowshrinking class kotlin.coroutines.Continuation
+
+# R8 full mode strips generic signatures from return types if not kept.
+-if interface * { @retrofit2.http.* public *** *(...); }
+-keep,allowoptimization,allowshrinking,allowobfuscation class <3>
+
+# With R8 full mode generic signatures are stripped for classes that are not kept.
+-keep,allowobfuscation,allowshrinking class retrofit2.Response