diff --git a/.circleci/config.yml b/.circleci/config.yml
index a4d2c77c..32b9e8c5 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -3,7 +3,7 @@ version: 2
 jobs:
   build:
     docker:
-      - image: circleci/openjdk:8-jdk
+      - image: classmethod/openjdk-with-git:8-jdk
     environment:
       JVM_OPTS: -Xmx3200m
       TERM: dumb
@@ -11,21 +11,17 @@ jobs:
       - checkout
       - restore_cache:
           keys:
-            - v1-{{ .Branch }}-{{ checksum ".circleci/config.yml" }}-{{ checksum "build.gradle" }}-{{ checksum "gradle/wrapper/gradle-wrapper.properties" }}
-            - v1-{{ .Branch }}-{{ checksum ".circleci/config.yml" }}
-            - v1-{{ .Branch }}
-            - v1-develop
-            - v1-master
+            - baseunits-{{ .Branch }}-{{ checksum ".circleci/config.yml" }}-{{ checksum "build.gradle" }}-{{ checksum "gradle/wrapper/gradle-wrapper.properties" }}
+            - baseunits-{{ .Branch }}-{{ checksum ".circleci/config.yml" }}
+            - baseunits-{{ .Branch }}
+            - baseunits-develop
+            - baseunits-master
       - run:
           name: Show gradle version
           command: ./gradlew -v
       - run:
           name: Download gradle dependencies
           command: ./gradlew dependencies
-      - save_cache:
-          paths:
-            - ~/.gradle
-          key: v1-{{ .Branch }}-{{ checksum ".circleci/config.yml" }}-{{ checksum "build.gradle" }}-{{ checksum "gradle/wrapper/gradle-wrapper.properties" }}
       - run:
           name: Run tests
           command: ./gradlew clean check
@@ -37,16 +33,18 @@ jobs:
       - deploy:
           name: Deploy artifacts
           command: |
-            if [ -n "${CIRCLE_TAG}" -a -n "${BINTRAY_USER}" ]; then
-              ./gradlew build bintrayUpload
-            fi
+            ./gradlew publish showVersion
+      - save_cache:
+          key: baseunits-{{ .Branch }}-{{ checksum ".circleci/config.yml" }}-{{ checksum "build.gradle" }}-{{ checksum "gradle/wrapper/gradle-wrapper.properties" }}
+          paths:
+            - "~/.gradle"
+            - "~/.m2"
 
 workflows:
   version: 2
   all:
     jobs:
       - build:
-          context: bintray
           filters:
             tags:
               only: /.*/
diff --git a/build.gradle b/build.gradle
index d8b8a17e..ffe292d7 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,6 +5,9 @@ buildscript {
 		maven { url "https://plugins.gradle.org/m2/" }
 		maven { url "http://repo.spring.io/plugins-release" }
 	}
+	dependencies {
+		classpath "jp.classmethod.aws:gradle-aws-plugin:0.41"
+	}
 }
 
 plugins {
@@ -24,6 +27,8 @@ apply from: "${rootProject.projectDir}/gradle/sourceArtifact.gradle"
 apply from: "${rootProject.projectDir}/gradle/bintray.gradle"
 
 group = 'jp.xet'
+ext.artifactId = "baseunits"
+version = rootProject.version
 
 // compiler
 sourceCompatibility = targetCompatibility = 1.8
@@ -81,3 +86,37 @@ jar {
 wrapper {
 	gradleVersion = "5.4.1"
 }
+
+// ======== deploy ========
+apply plugin: "jp.classmethod.aws"
+aws {
+	profileName = null
+}
+
+publishing {
+	repositories {
+		maven {
+			def releasesRepoUrl = "${System.getenv("PUBLISH_REPOSITORY")}/release"
+			def snapshotsRepoUrl = "${System.getenv("PUBLISH_REPOSITORY")}/snapshot"
+			url version.endsWith("SNAPSHOT") ? snapshotsRepoUrl : releasesRepoUrl
+
+			credentials(AwsCredentials) {
+				def profileName = project.hasProperty("awsProfileForMetropolisRepo") ? project.awsProfileForMetropolisRepo : null
+				def cred = aws.newCredentialsProvider(profileName).credentials
+				accessKey cred.getAWSAccessKeyId()
+				secretKey cred.getAWSSecretKey()
+			}
+		}
+	}
+
+	publications {
+		maven(MavenPublication) {
+			groupId project.group
+			artifactId project.artifactId
+			version project.version
+			from components.java
+			artifact sourcesJar
+			artifact javadocJar
+		}
+	}
+}
diff --git a/gradle/version.gradle b/gradle/version.gradle
index d0cd82c4..0458eb12 100644
--- a/gradle/version.gradle
+++ b/gradle/version.gradle
@@ -12,12 +12,15 @@ buildscript {
 
 ext {
 	git = org.ajoberstar.grgit.Grgit.open(dir: file('.'))
-	describedCommit = git.describe(tags: true).toString().trim()
+	revision = git.head().abbreviatedId
 }
 
-version = describedCommit +
-	(describedCommit.matches(".*-[0-9]+-g[0-9a-f]{7}") ? "-SNAPSHOT" : "") +
-	(git.status().isClean() ? "" : "+dirty")
+version = LocalDateTime.now().format("yyyyMMdd") + "-" + revision +
+		(git.branch.current.name != "master" ? "-SNAPSHOT" : "") +
+		(git.status().isClean() ? "" : "+dirty")
+if (System.getenv('CIRCLE_TAG') != null) {
+	version = System.getenv('CIRCLE_TAG')
+}
 
 task showVersion {
 	doLast {