diff --git a/pom.xml b/pom.xml
index 8dd3441..ed37ce9 100644
--- a/pom.xml
+++ b/pom.xml
@@ -53,7 +53,7 @@
       <artifactId>org.eclipse.jgit</artifactId>
       <version>6.6.0.202305301015-r</version>
     </dependency>
-    <dependency>
+    <!-- <dependency>
       <groupId>org.apache.logging.log4j</groupId>
       <artifactId>log4j-api</artifactId>
       <version>2.16.0</version>
@@ -62,7 +62,7 @@
       <groupId>org.apache.logging.log4j</groupId>
       <artifactId>log4j-core</artifactId>
       <version>2.16.0</version>
-    </dependency>
+    </dependency> -->
   </dependencies>
 
   <build>
diff --git a/src/main/java/istlab/KisoJikken/App.java b/src/main/java/istlab/KisoJikken/App.java
index 4a9df84..a4a38e1 100644
--- a/src/main/java/istlab/KisoJikken/App.java
+++ b/src/main/java/istlab/KisoJikken/App.java
@@ -21,8 +21,6 @@
 import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
 import org.eclipse.jgit.api.Git;
 import org.eclipse.jgit.api.errors.GitAPIException;
 
@@ -40,7 +38,7 @@
     public static String downloadurl = "https://cit.istlab.info/KisoJikkenNWP/target/";
 
     public static boolean isWindows;
-    static final Logger logger;
+    // static final Logger logger;
 
     static {
         userhome = System.getProperty("user.home");
@@ -48,7 +46,7 @@
                                                                         // https://stackoverflow.com/questions/1701839/string-replaceall-single-backslashes-with-double-backslashes
         String os = System.getProperty("os.name").toLowerCase();
         isWindows = os.contains("windows");
-        logger = LogManager.getLogger(App.class);
+        // logger = LogManager.getLogger(App.class);
     }
 
     // public App() {