diff --git a/src/main/java/run/halo/app/utils/Version.java b/src/main/java/run/halo/app/utils/Version.java
index 943586a63..f5ee356af 100644
--- a/src/main/java/run/halo/app/utils/Version.java
+++ b/src/main/java/run/halo/app/utils/Version.java
@@ -47,6 +47,11 @@ public class Version implements Comparable<Version> {
      */
     private static final Version EMPTY_VERSION = new Version(0, 0, 0);
 
+    /**
+     * Maximum version.
+     */
+    private static final Version MAXIMUM_VERSION = new Version(Long.MAX_VALUE, Long.MAX_VALUE, Long.MAX_VALUE);
+
     /**
      * Major number.
      */
@@ -128,7 +133,7 @@ public class Version implements Comparable<Version> {
         }
         // handle unknown version
         if (StringUtils.equalsIgnoreCase(version, HaloConst.UNKNOWN_VERSION)) {
-            return Optional.of(new Version());
+            return Optional.of(MAXIMUM_VERSION);
         }
         // get matcher for version
         Matcher matcher = PATTERN.matcher(version);
diff --git a/src/main/java/run/halo/app/utils/VersionUtil.java b/src/main/java/run/halo/app/utils/VersionUtil.java
index c2b7bdc20..fd4507ff5 100644
--- a/src/main/java/run/halo/app/utils/VersionUtil.java
+++ b/src/main/java/run/halo/app/utils/VersionUtil.java
@@ -1,11 +1,6 @@
 package run.halo.app.utils;
 
 import lombok.extern.slf4j.Slf4j;
-import org.springframework.util.Assert;
-import run.halo.app.model.support.HaloConst;
-
-import java.util.Objects;
-import java.util.StringTokenizer;
 
 /**
  * Version utility.
@@ -16,85 +11,11 @@ import java.util.StringTokenizer;
  * @date 2020-08-03
  */
 @Slf4j
-public class VersionUtil {
-
-    private static final String UNDERLINE = "_";
+public final class VersionUtil {
 
     private VersionUtil() {
     }
 
-    @Deprecated
-    public static int[] getCanonicalVersion(String version) {
-        Assert.hasText(version, "Version must not be blank");
-
-        if (Objects.equals(version, HaloConst.UNKNOWN_VERSION)) {
-            log.warn("Unknown version will be converted to {}.{}.{}.{}",
-                    Integer.MAX_VALUE,
-                    Integer.MAX_VALUE,
-                    Integer.MAX_VALUE,
-                    Integer.MAX_VALUE);
-            return new int[] {Integer.MAX_VALUE,
-                    Integer.MAX_VALUE,
-                    Integer.MAX_VALUE,
-                    Integer.MAX_VALUE};
-        }
-
-        int[] canonicalVersion = new int[] {1, 1, 0, 0};
-        StringTokenizer tokenizer = new StringTokenizer(version, ".");
-        String token = tokenizer.nextToken();
-        canonicalVersion[0] = Integer.parseInt(token);
-        token = tokenizer.nextToken();
-        StringTokenizer subTokenizer;
-        if (!token.contains(UNDERLINE)) {
-            canonicalVersion[1] = Integer.parseInt(token);
-        } else {
-            subTokenizer = new StringTokenizer(token, UNDERLINE);
-            canonicalVersion[1] = Integer.parseInt(subTokenizer.nextToken());
-            canonicalVersion[3] = Integer.parseInt(subTokenizer.nextToken());
-        }
-
-        if (tokenizer.hasMoreTokens()) {
-            token = tokenizer.nextToken();
-            if (!token.contains(UNDERLINE)) {
-                canonicalVersion[2] = Integer.parseInt(token);
-                if (tokenizer.hasMoreTokens()) {
-                    canonicalVersion[3] = Integer.parseInt(tokenizer.nextToken());
-                }
-            } else {
-                subTokenizer = new StringTokenizer(token, UNDERLINE);
-                canonicalVersion[2] = Integer.parseInt(subTokenizer.nextToken());
-                canonicalVersion[3] = Integer.parseInt(subTokenizer.nextToken());
-            }
-        }
-
-        return canonicalVersion;
-    }
-
-    @Deprecated
-    public static int compare(String version1, String version2) {
-        log.debug("Comparing version [{}] with [{}]", version1, version2);
-
-        int[] canonicalVersion1 = getCanonicalVersion(version1);
-        int[] canonicalVersion2 = getCanonicalVersion(version2);
-        if (canonicalVersion1[0] < canonicalVersion2[0]) {
-            return -1;
-        } else if (canonicalVersion1[0] > canonicalVersion2[0]) {
-            return 1;
-        } else if (canonicalVersion1[1] < canonicalVersion2[1]) {
-            return -1;
-        } else if (canonicalVersion1[1] > canonicalVersion2[1]) {
-            return 1;
-        } else if (canonicalVersion1[2] < canonicalVersion2[2]) {
-            return -1;
-        } else if (canonicalVersion1[2] > canonicalVersion2[2]) {
-            return 1;
-        } else if (canonicalVersion1[3] < canonicalVersion2[3]) {
-            return -1;
-        } else {
-            return canonicalVersion1[3] > canonicalVersion2[3] ? 1 : 0;
-        }
-    }
-
     /**
      * Compare version.
      *
diff --git a/src/test/java/run/halo/app/utils/VersionUtilTest.java b/src/test/java/run/halo/app/utils/VersionUtilTest.java
index fdd22db3d..c11adbf28 100644
--- a/src/test/java/run/halo/app/utils/VersionUtilTest.java
+++ b/src/test/java/run/halo/app/utils/VersionUtilTest.java
@@ -4,7 +4,8 @@ import org.apache.commons.lang3.RandomStringUtils;
 import org.junit.jupiter.api.Test;
 import run.halo.app.model.support.HaloConst;
 
-import static org.junit.jupiter.api.Assertions.*;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 /**
  * @author ryanwang
@@ -29,17 +30,7 @@ class VersionUtilTest {
                 RandomStringUtils.randomNumeric(1),
                 RandomStringUtils.randomNumeric(2),
                 RandomStringUtils.randomNumeric(3));
-        assertFalse(VersionUtil.compareVersion(HaloConst.UNKNOWN_VERSION, randomVersion));
+        assertTrue(VersionUtil.compareVersion(HaloConst.UNKNOWN_VERSION, randomVersion));
     }
 
-    @Test
-    void unknownOrEmptyCanonicalVersionTest() {
-        assertThrows(IllegalArgumentException.class, () -> VersionUtil.getCanonicalVersion(null));
-        int[] version = VersionUtil.getCanonicalVersion(HaloConst.UNKNOWN_VERSION);
-        assertNotNull(version);
-        assertEquals(4, version.length);
-        for (int v : version) {
-            assertEquals(Integer.MAX_VALUE, v);
-        }
-    }
 }
\ No newline at end of file