diff --git a/src/main/java/org/codelibs/fess/mylasta/direction/sponsor/FessMultipartRequestHandler.java b/src/main/java/org/codelibs/fess/mylasta/direction/sponsor/FessMultipartRequestHandler.java
index 88c36d60c..36933ea80 100644
--- a/src/main/java/org/codelibs/fess/mylasta/direction/sponsor/FessMultipartRequestHandler.java
+++ b/src/main/java/org/codelibs/fess/mylasta/direction/sponsor/FessMultipartRequestHandler.java
@@ -61,7 +61,7 @@ public class FessMultipartRequestHandler implements MultipartRequestHandler {
     //                                   Temporary Directory
     //                                   -------------------
     // used as repository for requested parameters
-    protected static final String CONTEXT_TEMPDIR_KEY = "javax.servlet.context.tempdir"; // prior
+    protected static final String CONTEXT_TEMPDIR_KEY = "jakarta.servlet.context.tempdir";
     protected static final String JAVA_IO_TMPDIR_KEY = "java.io.tmpdir"; // secondary
 
     // ===================================================================================
@@ -423,4 +423,4 @@ public class FessMultipartRequestHandler implements MultipartRequestHandler {
     public Map<String, MultipartFormFile> getFileElements() { // me too
         return elementsFile;
     }
-}
\ No newline at end of file
+}