diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
new file mode 100644
index 0000000000000000000000000000000000000000..5dcacae866c5ebe1d583097bb10863f579608d8b
--- /dev/null
+++ b/.github/workflows/codeql-analysis.yml
@@ -0,0 +1,94 @@
+# For most projects, this workflow file will not need changing; you simply need
+# to commit it to your repository.
+#
+# You may wish to alter this file to override the set of languages analyzed,
+# or to provide custom queries or build logic.
+name: "CodeQL"
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [master]
+  schedule:
+    - cron: '36 4 * * 2'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        # Override automatic language detection by changing the below list
+        # Supported options are ['csharp', 'cpp', 'go', 'java', 'javascript', 'python']
+        language: ['java', 'javascript']
+        # Learn more...
+        # https://docs.github.com/en/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#overriding-automatic-language-detection
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+      with:
+        # We must fetch at least the immediate parents so that if this is
+        # a pull request then we can checkout the head.
+        fetch-depth: 2
+
+    # If this run was triggered by a pull request event, then checkout
+    # the head of the pull request instead of the merge commit.
+    - run: git checkout HEAD^2
+      if: ${{ github.event_name == 'pull_request' }}
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v1
+      with:
+        languages: ${{ matrix.language }}
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file. 
+        # Prefix the list here with "+" to use these queries and those in the config file.
+        # queries: ./path/to/local/query, your-org/your-repo/queries@main
+
+    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    #- name: Autobuild
+    #  uses: github/codeql-action/autobuild@v1
+
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 https://git.io/JvXDl
+
+    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
+    #    and modify them (or add more) to build your code if your project
+    #    uses a compiled language
+
+    #- run: |
+    #   make bootstrap
+    #   make release
+    - uses: actions/checkout@v2
+    - name: Set up JDK 17
+      uses: actions/setup-java@v2
+      with:
+        java-version: '17'
+        distribution: 'temurin'
+    - name: Cache Maven packages
+      uses: actions/cache@v2
+      with:
+        path: ~/.m2
+        key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
+        restore-keys: ${{ runner.os }}-m2
+    - name: Checkout fess-parent
+      uses: actions/checkout@v2
+      with:
+        repository: codelibs/fess-parent
+        path: fess-parent
+    - name: Install fess-parent
+      run: |
+        cd fess-parent
+        mvn install
+    - name: Build with Maven
+      run: mvn -B package --file pom.xml
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v1
diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index 110b3c84af0a384558ce4a17ec0350b2fa8fe969..5291f9cba70e69ac98101842994a96da327fc556 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -16,10 +16,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Set up JDK 11
+    - name: Set up JDK 17
       uses: actions/setup-java@v2
       with:
-        java-version: '11'
+        java-version: '17'
         distribution: 'temurin'
     - uses: actions/cache@v1
       with:
diff --git a/pom.xml b/pom.xml
index ec12353af1a94b76b863233dc46ec91e41b1ca38..6282acf92353ba23f08621eb0339d47f6842e2ec 100644
--- a/pom.xml
+++ b/pom.xml
@@ -2,7 +2,7 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 	<artifactId>fess</artifactId>
-	<version>13.15.1-SNAPSHOT</version>
+	<version>14.0.0-SNAPSHOT</version>
 	<packaging>war</packaging>
 	<name>Fess</name>
 	<description>Fess is Full tExt Search System.</description>
@@ -30,7 +30,7 @@
 	<parent>
 		<groupId>org.codelibs.fess</groupId>
 		<artifactId>fess-parent</artifactId>
-		<version>13.15.0</version>
+		<version>14.0.0-SNAPSHOT</version>
 		<relativePath />
 	</parent>
 	<properties>
diff --git a/src/test/java/org/codelibs/fess/helper/DocumentHelperTest.java b/src/test/java/org/codelibs/fess/helper/DocumentHelperTest.java
index dc6d99c7c2f00f8d408e1a46114192021849b5ec..01239707e9f139c7c9c01d567427d0005bbfec93 100644
--- a/src/test/java/org/codelibs/fess/helper/DocumentHelperTest.java
+++ b/src/test/java/org/codelibs/fess/helper/DocumentHelperTest.java
@@ -125,20 +125,20 @@ public class DocumentHelperTest extends UnitFessTestCase {
         DocumentHelper documentHelper = new DocumentHelper();
 
         String hash = "01010101010101010101010101010101";
-        String value = "$H4sIAAAAAAAAADMwNMALAXC7sg0gAAAA";
+        String value = "$H4sIAAAAAAAA_zMwNMALAXC7sg0gAAAA";
         assertEquals(value, documentHelper.encodeSimilarDocHash(hash));
         hash = "00101010010010100100101010001010";
-        value = "$H4sIAAAAAAAAADMwMARDCELQQApMAgAi5-3LIAAAAA";
+        value = "$H4sIAAAAAAAA_zMwMARDCELQQApMAgAi5-3LIAAAAA";
         assertEquals(value, documentHelper.encodeSimilarDocHash(hash));
         hash = "0001010100100101001001010100010100101010010010100100101011000100";
-        value = "$H4sIAAAAAAAAADMwMDAEQwhC0EAKxscqDZE3AABZOHx2QAAAAA";
+        value = "$H4sIAAAAAAAA_zMwMDAEQwhC0EAKxscqDZE3AABZOHx2QAAAAA";
         assertEquals(value, documentHelper.encodeSimilarDocHash(hash));
         hash = "00100101010001010100100101001001010100010100010101010010010101010010101100010101001000010101001001010001000001010010101001001010";
-        value = "$H4sIAAAAAAAAADMwMDQAIhCE01ARdBkYD1kGxkDVjWESRBBJPVwKAHL5QrqAAAAA";
+        value = "$H4sIAAAAAAAA_zMwMDQAIhCE01ARdBkYD1kGxkDVjWESRBBJPVwKAHL5QrqAAAAA";
         assertEquals(value, documentHelper.encodeSimilarDocHash(hash));
 
         hash = "";
-        value = "$H4sIAAAAAAAAAAMAAAAAAAAAAAA";
+        value = "$H4sIAAAAAAAA_wMAAAAAAAAAAAA";
         assertEquals(value, documentHelper.encodeSimilarDocHash(hash));
         hash = "$H4sIAAAAAAAAAAMAAAAAAAAAAAA";
         value = "$H4sIAAAAAAAAAAMAAAAAAAAAAAA";