diff --git a/fluent-plugin-systemd.gemspec b/fluent-plugin-systemd.gemspec
index b64e6bc..e826a8d 100644
--- a/fluent-plugin-systemd.gemspec
+++ b/fluent-plugin-systemd.gemspec
@@ -24,5 +24,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rubocop', '1.13.0'
 
   spec.add_runtime_dependency 'fluentd', ['>= 0.14.11', '< 2']
-  spec.add_runtime_dependency 'systemd-journal', '~> 1.4.2'
+  spec.add_runtime_dependency 'systemd-journal', '~> 2.0.0'
 end
diff --git a/test/docker/Dockerfile.tdagent-ubuntu b/test/docker/Dockerfile.tdagent-ubuntu
index 212c8ec..f7a5035 100644
--- a/test/docker/Dockerfile.tdagent-ubuntu
+++ b/test/docker/Dockerfile.tdagent-ubuntu
@@ -1,4 +1,4 @@
-FROM ubuntu:focal
+FROM ubuntu:jammy
 
 RUN apt-get update -q \
       && apt-get install -qy --no-install-recommends \
@@ -8,7 +8,7 @@ RUN apt-get update -q \
         gnupg \
         libsystemd0 \
       && curl https://packages.treasuredata.com/GPG-KEY-td-agent | apt-key add - \
-      && echo "deb http://packages.treasuredata.com/4/ubuntu/focal/ focal contrib" > /etc/apt/sources.list.d/treasure-data.list \
+      && echo "deb http://packages.treasuredata.com/4/ubuntu/jammy/ jammy contrib" > /etc/apt/sources.list.d/treasure-data.list \
       && apt-get update \
       && apt-get install -y td-agent \
       && apt-get clean \
diff --git a/test/docker/Dockerfile.ubuntu b/test/docker/Dockerfile.ubuntu
index 82a6d01..202a215 100644
--- a/test/docker/Dockerfile.ubuntu
+++ b/test/docker/Dockerfile.ubuntu
@@ -1,4 +1,4 @@
-FROM ubuntu:focal
+FROM ubuntu:jammy
 
 RUN apt-get update -q && apt-get install -qy --no-install-recommends \
         build-essential \