diff --git a/src/main/java/org/codelibs/fess/app/web/admin/upgrade/AdminUpgradeAction.java b/src/main/java/org/codelibs/fess/app/web/admin/upgrade/AdminUpgradeAction.java
index 0205d8156..f3e36c34a 100644
--- a/src/main/java/org/codelibs/fess/app/web/admin/upgrade/AdminUpgradeAction.java
+++ b/src/main/java/org/codelibs/fess/app/web/admin/upgrade/AdminUpgradeAction.java
@@ -92,6 +92,8 @@ public class AdminUpgradeAction extends FessAdminAction {
 
     private static final String VERSION_13_14 = "13.14";
 
+    private static final String VERSION_13_15 = "13.15";
+
     // ===================================================================================
     //                                                                           Attribute
     //
@@ -181,6 +183,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom13_12();
                 upgradeFrom13_13();
                 upgradeFrom13_14();
+                upgradeFrom13_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -213,6 +216,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom13_12();
                 upgradeFrom13_13();
                 upgradeFrom13_14();
+                upgradeFrom13_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -244,6 +248,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom13_12();
                 upgradeFrom13_13();
                 upgradeFrom13_14();
+                upgradeFrom13_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -274,6 +279,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom13_12();
                 upgradeFrom13_13();
                 upgradeFrom13_14();
+                upgradeFrom13_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -303,6 +309,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom13_12();
                 upgradeFrom13_13();
                 upgradeFrom13_14();
+                upgradeFrom13_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -331,6 +338,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom13_12();
                 upgradeFrom13_13();
                 upgradeFrom13_14();
+                upgradeFrom13_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -358,6 +366,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom13_12();
                 upgradeFrom13_13();
                 upgradeFrom13_14();
+                upgradeFrom13_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -383,6 +392,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom13_12();
                 upgradeFrom13_13();
                 upgradeFrom13_14();
+                upgradeFrom13_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -408,6 +418,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom13_12();
                 upgradeFrom13_13();
                 upgradeFrom13_14();
+                upgradeFrom13_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -432,6 +443,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom13_12();
                 upgradeFrom13_13();
                 upgradeFrom13_14();
+                upgradeFrom13_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -455,6 +467,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom13_12();
                 upgradeFrom13_13();
                 upgradeFrom13_14();
+                upgradeFrom13_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -477,6 +490,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom13_12();
                 upgradeFrom13_13();
                 upgradeFrom13_14();
+                upgradeFrom13_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -498,6 +512,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom13_12();
                 upgradeFrom13_13();
                 upgradeFrom13_14();
+                upgradeFrom13_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -518,6 +533,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom13_12();
                 upgradeFrom13_13();
                 upgradeFrom13_14();
+                upgradeFrom13_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -537,6 +553,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom13_12();
                 upgradeFrom13_13();
                 upgradeFrom13_14();
+                upgradeFrom13_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -555,6 +572,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom13_12();
                 upgradeFrom13_13();
                 upgradeFrom13_14();
+                upgradeFrom13_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -572,6 +590,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom13_12();
                 upgradeFrom13_13();
                 upgradeFrom13_14();
+                upgradeFrom13_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -588,6 +607,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom13_12();
                 upgradeFrom13_13();
                 upgradeFrom13_14();
+                upgradeFrom13_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -603,6 +623,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom13_12();
                 upgradeFrom13_13();
                 upgradeFrom13_14();
+                upgradeFrom13_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -617,6 +638,7 @@ public class AdminUpgradeAction extends FessAdminAction {
                 upgradeFrom13_12();
                 upgradeFrom13_13();
                 upgradeFrom13_14();
+                upgradeFrom13_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -630,6 +652,7 @@ public class AdminUpgradeAction extends FessAdminAction {
             try {
                 upgradeFrom13_13();
                 upgradeFrom13_14();
+                upgradeFrom13_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -642,6 +665,7 @@ public class AdminUpgradeAction extends FessAdminAction {
         } else if (VERSION_13_14.equals(form.targetVersion)) {
             try {
                 upgradeFrom13_14();
+                upgradeFrom13_15();
                 upgradeFromAll();
 
                 saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
@@ -651,6 +675,18 @@ public class AdminUpgradeAction extends FessAdminAction {
                 logger.warn("Failed to upgrade data.", e);
                 saveError(messages -> messages.addErrorsFailedToUpgradeFrom(GLOBAL, VERSION_13_14, e.getLocalizedMessage()));
             }
+        } else if (VERSION_13_15.equals(form.targetVersion)) {
+            try {
+                upgradeFrom13_15();
+                upgradeFromAll();
+
+                saveInfo(messages -> messages.addSuccessStartedDataUpdate(GLOBAL));
+
+                systemHelper.reloadConfiguration();
+            } catch (final Exception e) {
+                logger.warn("Failed to upgrade data.", e);
+                saveError(messages -> messages.addErrorsFailedToUpgradeFrom(GLOBAL, VERSION_13_15, e.getLocalizedMessage()));
+            }
         } else {
             saveError(messages -> messages.addErrorsUnknownVersionForUpgrade(GLOBAL));
         }
@@ -758,6 +794,10 @@ public class AdminUpgradeAction extends FessAdminAction {
         // nothing
     }
 
+    private void upgradeFrom13_15() {
+        // nothing
+    }
+
     private void upgradeFromAll() {
         // nothing
     }
diff --git a/src/main/webapp/WEB-INF/view/admin/upgrade/admin_upgrade.jsp b/src/main/webapp/WEB-INF/view/admin/upgrade/admin_upgrade.jsp
index 0933f55a9..712173541 100644
--- a/src/main/webapp/WEB-INF/view/admin/upgrade/admin_upgrade.jsp
+++ b/src/main/webapp/WEB-INF/view/admin/upgrade/admin_upgrade.jsp
@@ -73,6 +73,7 @@
 											<la:option value="13.12">13.12</la:option>
 											<la:option value="13.13">13.13</la:option>
 											<la:option value="13.14">13.14</la:option>
+											<la:option value="13.14">13.15</la:option>
 										</la:select>
 									</div>
 								</div>