diff --git a/core/src/main/java/hudson/PluginWrapper.java b/core/src/main/java/hudson/PluginWrapper.java
index 3b537f4a63..5b738e8237 100644
--- a/core/src/main/java/hudson/PluginWrapper.java
+++ b/core/src/main/java/hudson/PluginWrapper.java
@@ -369,8 +369,7 @@ public class PluginWrapper implements Comparable<PluginWrapper>, ModelObject {
      * @since TODO
      */
     public boolean isDeprecated() {
-        UpdateSite.Plugin info = getInfo();
-        return info != null && Arrays.asList(info.categories).contains("deprecated");
+        return getInfo().isDeprecated();
     }
 
     @ExportedBean
diff --git a/core/src/main/java/hudson/model/UpdateCenter.java b/core/src/main/java/hudson/model/UpdateCenter.java
index 4ab5e89cda..d9d81537e3 100644
--- a/core/src/main/java/hudson/model/UpdateCenter.java
+++ b/core/src/main/java/hudson/model/UpdateCenter.java
@@ -969,6 +969,10 @@ public class UpdateCenter extends AbstractModelObject implements Saveable, OnMas
         Map<String,Plugin> pluginMap = new LinkedHashMap<>();
         for (UpdateSite site : sites) {
             for (Plugin plugin: site.getAvailables()) {
+                if (plugin.isDeprecated()) {
+                    // hide plugins that are deprecated
+                    continue;
+                }
                 final Plugin existing = pluginMap.get(plugin.name);
                 if (existing == null) {
                     pluginMap.put(plugin.name, plugin);
diff --git a/core/src/main/java/hudson/model/UpdateSite.java b/core/src/main/java/hudson/model/UpdateSite.java
index de54334b95..225ec7912a 100644
--- a/core/src/main/java/hudson/model/UpdateSite.java
+++ b/core/src/main/java/hudson/model/UpdateSite.java
@@ -44,6 +44,7 @@ import java.net.URI;
 import java.net.URL;
 import java.net.URLEncoder;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collections;
 import java.util.HashSet;
 import java.util.List;
@@ -1338,6 +1339,15 @@ public class UpdateSite {
             return warnings;
         }
 
+        /**
+         * Is this plugin labeled deprecated?
+         * @return {@code true} when plugin contains deprecated in categories, otherwise {@code false}.
+         * @since TODO
+         */
+        public boolean isDeprecated() {
+            return categories != null && Arrays.asList(categories).contains("deprecated");
+        }
+
         /**
          * @since 2.40
          */