Its working. Still needs some polish though!

mastodon/src/github/java/org/joinmastodon/android/updater/GithubSelfUpdaterImpl.java

@@ -61,6 +61,7 @@ public class GithubSelfUpdaterImpl extends GithubSelfUpdater{
 			info=new UpdateInfo();
 			info.version=prefs.getString("version", null);
 			info.size=prefs.getLong("apkSize", 0);
+			info.changelog=prefs.getString("changelog", null);
 			downloadID=prefs.getLong("downloadID", 0);
 			if(downloadID==0 || !getUpdateApkFile().exists()){
 				state=UpdateState.UPDATE_AVAILABLE;
@@ -84,6 +85,7 @@ public class GithubSelfUpdaterImpl extends GithubSelfUpdater{
 					.remove("apkURL")
 					.remove("checkedByBuild")
 					.remove("downloadID")
+					.remove("changelog")
 					.apply();
 		}
 	}
@@ -160,6 +162,7 @@ public class GithubSelfUpdaterImpl extends GithubSelfUpdater{
 								.putString("version", version)
 								.putString("apkURL", url)
 								.putInt("checkedByBuild", BuildConfig.VERSION_CODE)
+								.putString("changelog", changelog)
 								.remove("downloadID")
 								.apply();
 

mastodon/src/main/java/org/joinmastodon/android/fragments/SettingsFragment.java

@@ -839,7 +839,7 @@ public class SettingsFragment extends MastodonToolbarFragment{
 
 	private class UpdateViewHolder extends BindableViewHolder<UpdateItem>{
 
-		private final TextView text;
+		private final TextView text, changelog;
 		private final Button button;
 		private final ImageButton cancelBtn;
 		private final ProgressBar progress;
@@ -850,6 +850,7 @@ public class SettingsFragment extends MastodonToolbarFragment{
 		public UpdateViewHolder(){
 			super(getActivity(), R.layout.item_settings_update, list);
 			text=findViewById(R.id.text);
+			changelog=findViewById(R.id.changelog);
 			button=findViewById(R.id.button);
 			cancelBtn=findViewById(R.id.cancel_btn);
 			progress=findViewById(R.id.progress);
@@ -893,6 +894,7 @@ public class SettingsFragment extends MastodonToolbarFragment{
 				progress.setVisibility(View.GONE);
 				progress.removeCallbacks(progressUpdater);
 			}
+			changelog.setText(getString(R.string.sk_changelog, info.changelog));
 		}
 
 		private void updateProgress(){

mastodon/src/main/res/layout/item_settings_update.xml

@@ -7,23 +7,29 @@
 
 	<LinearLayout
 		android:layout_width="match_parent"
-		android:layout_height="wrap_content"
+		android:layout_height="match_parent"
-		android:minHeight="64dp"
-		android:gravity="center_vertical"
-		android:paddingStart="16dp"
 		android:background="@drawable/bg_settings_update"
-		android:orientation="horizontal">
+		android:orientation="vertical">
+
+		<LinearLayout
+			android:layout_width="match_parent"
+			android:layout_height="wrap_content"
+			android:background="@drawable/bg_settings_update"
+			android:gravity="center_vertical"
+			android:minHeight="64dp"
+			android:orientation="horizontal"
+			android:paddingStart="16dp">
 
 			<TextView
 				android:id="@+id/text"
 				android:layout_width="0dp"
 				android:layout_height="wrap_content"
-			android:layout_weight="1"
-			android:layout_marginEnd="4dp"
 				android:layout_marginTop="16dp"
+				android:layout_marginEnd="4dp"
 				android:layout_marginBottom="16dp"
+				android:layout_weight="1"
 				android:textAppearance="@style/m3_body_medium"
-			tools:text="@string/sk_update_available"/>
+				tools:text="@string/sk_update_available" />
 
 			<FrameLayout
 				android:layout_width="wrap_content"
@@ -35,13 +41,13 @@
 					android:layout_height="wrap_content"
 					android:layout_gravity="center_vertical|end"
 					android:background="?android:selectableItemBackground"
-				android:textColor="?android:textColorPrimary"
-				android:textAllCaps="true"
-				android:textSize="14dp"
 					android:paddingLeft="16dp"
 					android:paddingRight="16dp"
 					android:stateListAnimator="@null"
-				tools:text="@string/install_update"/>
+					android:textAllCaps="true"
+					android:textColor="?android:textColorPrimary"
+					android:textSize="14dp"
+					tools:text="@string/install_update" />
 
 				<ImageButton
 					android:id="@+id/cancel_btn"
@@ -50,10 +56,10 @@
 					android:layout_gravity="end|center_vertical"
 					android:layout_marginEnd="16dp"
 					android:background="@drawable/bg_update_download_progress"
-				android:tint="?colorSearchHint"
 					android:contentDescription="@string/cancel"
-				android:visibility="gone"
+					android:src="@drawable/ic_fluent_dismiss_16_filled"
-				android:src="@drawable/ic_fluent_dismiss_16_filled"/>
+					android:tint="?colorSearchHint"
+					android:visibility="gone" />
 
 				<ProgressBar
 					android:id="@+id/progress"
@@ -61,15 +67,26 @@
 					android:layout_height="40dp"
 					android:layout_gravity="end|center_vertical"
 					android:layout_marginEnd="16dp"
-				android:progressDrawable="@drawable/update_progress"
+					android:indeterminate="false"
+					android:indeterminateOnly="false"
 					android:max="1000"
 					android:padding="0dp"
-				android:visibility="gone"
+					android:progressDrawable="@drawable/update_progress"
-				android:indeterminateOnly="false"
+					android:visibility="gone" />
-				android:indeterminate="false"/>
 
 			</FrameLayout>
 
 		</LinearLayout>
 
+		<TextView
+			android:id="@+id/changelog"
+			android:layout_width="match_parent"
+			android:layout_height="wrap_content"
+			android:textAppearance="@style/m3_body_medium"
+			android:paddingStart="16dp"
+			android:paddingBottom="16dp"
+			android:text="Changelog" />
+	</LinearLayout>
+
+
 </FrameLayout>

mastodon/src/main/res/values/strings_sk.xml

@@ -27,6 +27,7 @@
     <string name="sk_federated_timeline_info_banner">These are the most recent posts by the people in your federation.</string>
     <string name="sk_update_available">Moshidon %s is ready to download.</string>
     <string name="sk_update_ready">Moshidon %s is downloaded and ready to install.</string>
+    <string name="sk_changelog">Changelog: \n%s</string>
     <string name="sk_check_for_update">Check for update</string>
     <string name="sk_no_update_available">No update available</string>
     <string name="sk_list_timelines">Lists</string>