diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 5e3ab3a..909569b 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -9,9 +9,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        jacksonVersion: [ "2.6.7.5", "2.7.9", "2.8.11", "2.9.10", "2.10.5", "2.11.4", "2.12.7", "2.13.5", "2.14.3", "2.15.2" ]
+        jacksonVersion: [ "2.15.3" ]
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up OpenJDK 8
       uses: actions/setup-java@v3
       with:
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index f9917c1..e55c971 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -10,7 +10,7 @@ jobs:
       hash-master: ${{ steps.hash-master.outputs.hash-master }}
       hash-main: ${{ steps.hash-main.outputs.hash-main }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 0
     - id: hash-master
@@ -30,7 +30,7 @@ jobs:
     if: needs.diff.outputs.hash-master != needs.diff.outputs.hash-main
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 0
     - name: Checkout master
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 7c39399..30a6966 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: true
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up OpenJDK 8
       uses: actions/setup-java@v3
       with:
diff --git a/build.gradle b/build.gradle
index 564002c..1d1302d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -8,7 +8,7 @@ plugins {
 
 ext {
     if (!project.hasProperty("jacksonVersionForJacksonTest")) {
-        jacksonVersionForJacksonTest = "2.6.7.5"
+        jacksonVersionForJacksonTest = "2.15.3"
     }
 }
 
@@ -62,7 +62,7 @@ dependencies {
 
     // Dependencies should be "api" so that their scope would be "compile" in "pom.xml".
     api "javax.validation:validation-api:1.1.0.Final"
-    api platform("com.fasterxml.jackson:jackson-bom:2.6.7.5")
+    api platform("com.fasterxml.jackson:jackson-bom:2.15.3")
     api "com.fasterxml.jackson.core:jackson-annotations"
     api "com.fasterxml.jackson.core:jackson-core"
     api "com.fasterxml.jackson.core:jackson-databind"
@@ -186,7 +186,7 @@ publishing {
                 developers {
                     developer {
                         name = "Dai MIKURUBE"
-                        email = "dmikurube@treasure-data.com"
+                        email = "dmikurube@acm.org"
                     }
                 }
 
diff --git a/gradle.lockfile b/gradle.lockfile
index e77f123..a8b5a79 100644
--- a/gradle.lockfile
+++ b/gradle.lockfile
@@ -1,11 +1,11 @@
 # This is a Gradle generated file for dependency locking.
 # Manual edits can break the build and are not advised.
 # This file is expected to be part of source control.
-com.fasterxml.jackson.core:jackson-annotations:2.6.7=compileClasspath,runtimeClasspath
-com.fasterxml.jackson.core:jackson-core:2.6.7=compileClasspath,runtimeClasspath
-com.fasterxml.jackson.core:jackson-databind:2.6.7.5=compileClasspath,runtimeClasspath
-com.fasterxml.jackson.datatype:jackson-datatype-jdk8:2.6.7=compileClasspath,runtimeClasspath
-com.fasterxml.jackson:jackson-bom:2.6.7.5=compileClasspath,runtimeClasspath
+com.fasterxml.jackson.core:jackson-annotations:2.15.3=compileClasspath,runtimeClasspath
+com.fasterxml.jackson.core:jackson-core:2.15.3=compileClasspath,runtimeClasspath
+com.fasterxml.jackson.core:jackson-databind:2.15.3=compileClasspath,runtimeClasspath
+com.fasterxml.jackson.datatype:jackson-datatype-jdk8:2.15.3=compileClasspath,runtimeClasspath
+com.fasterxml.jackson:jackson-bom:2.15.3=compileClasspath,runtimeClasspath
 javax.validation:validation-api:1.1.0.Final=compileClasspath,runtimeClasspath
 org.embulk:embulk-spi:0.11=compileClasspath
 org.msgpack:msgpack-core:0.8.24=compileClasspath