diff --git a/yubikey-ca-java/README.md b/yubikey-ca-java/README.md
index 8276b2b..5956fc2 100644
--- a/yubikey-ca-java/README.md
+++ b/yubikey-ca-java/README.md
@@ -35,8 +35,9 @@ $ java -jar yubikey-ca-java.jar --issue-root-ca \
 
 ```shell
 $ java -jar yubikey-ca-java.jar --issue-intermediate-ca \
-       --sign-slot 88 --subject 'CN=Hatter EC Intermediate CA' \
+       --sign-slot 88 \
        --cert-slot 89 --root-ca-id 43 \
+       --subject 'CN=Hatter EC Intermediate CA' \
        [--pin ******] \
        [--add-to-remote]
 ```
@@ -45,11 +46,12 @@ $ java -jar yubikey-ca-java.jar --issue-intermediate-ca \
 
 ```shell
 $ java -jar yubikey-ca-java.jar --issue-server-ca \
-       --sign-slot 89 --subject 'CN=hatter-test' \
+       --sign-slot 89 \
        --intermediate-ca-id 44 --keypair-type secp256r1 \
+       --subject 'CN=hatter-test' \
        --dns-name a.example.com --dns-name b.example.com \
        [--pin ******] \
-       [--cert-slot NN | --cert-file <CERT-FILE-PEM>] \
+       [--cert-slot NN | --cert-file <CERT-FILE-PEM>] | --cert-public-key '-----BEGIN PUBLIC KEY-----...' \
        [--add-to-remote]
 ```
 
@@ -57,8 +59,9 @@ $ java -jar yubikey-ca-java.jar --issue-server-ca \
 
 ```shell
 $ java -jar yubikey-ca-java.jar --issue-client-ca \
-       --sign-slot 89 --subject 'CN=hatter-test' \
+       --sign-slot 89 \
        --intermediate-ca-id 44 --keypair-type secp256r1 \
+       --subject 'CN=hatter-test' \
        [--pin ******] \
        [--add-to-remote]
 ```
@@ -67,8 +70,9 @@ $ java -jar yubikey-ca-java.jar --issue-client-ca \
 
 ```shell
 $ java -jar yubikey-ca-java.jar --issue-client-code-ca \
-       --sign-slot 89 --subject 'CN=hatter-test-code' \
+       --sign-slot 89 \
        --intermediate-ca-id 44 --keypair-type secp256r1 \
+       --subject 'CN=hatter-test-code' \
        [--pin ******] \
        [--add-to-remote]
 ```
@@ -77,8 +81,9 @@ or
 
 ```shell
 $ java -jar yubikey-ca-java.jar --issue-client-code-ca \
-       --sign-slot 89 --cert-slot 90 --subject 'CN=Hatter Signing CA' --valid-years 10 \
+       --sign-slot 89 --cert-slot 90 \
        --intermediate-ca-id 44 \
+       --subject 'CN=Hatter Signing CA' --valid-years 10 \
        --pin ****** \
        [--add-to-remote]
 ```
diff --git a/yubikey-ca-java/src/main/java/me/hatter/tools/yubikeyca/YubikeyCaArgs.java b/yubikey-ca-java/src/main/java/me/hatter/tools/yubikeyca/YubikeyCaArgs.java
index f7fba37..46bfb51 100644
--- a/yubikey-ca-java/src/main/java/me/hatter/tools/yubikeyca/YubikeyCaArgs.java
+++ b/yubikey-ca-java/src/main/java/me/hatter/tools/yubikeyca/YubikeyCaArgs.java
@@ -53,9 +53,12 @@ public class YubikeyCaArgs {
     @Option(names = {"--cert-slot"}, description = "Slot for cert")
     String certSlot;
 
-    @Option(names = {"--cert-file"}, description = "File for cert(PEM)")
+    @Option(names = {"--cert-file"}, description = "File for cert(Public key PEM)")
     String certFile;
 
+    @Option(names = {"--cert-public-key"}, description = "PEM for cert(Public key PEM)")
+    String certPublicKey;
+
     @Option(names = {"--pin"}, description = "Yubikey PIV PIN")
     String pin;
 
diff --git a/yubikey-ca-java/src/main/java/me/hatter/tools/yubikeyca/YubikeyCaConstant.java b/yubikey-ca-java/src/main/java/me/hatter/tools/yubikeyca/YubikeyCaConstant.java
index 5d5ea06..4a17e24 100644
--- a/yubikey-ca-java/src/main/java/me/hatter/tools/yubikeyca/YubikeyCaConstant.java
+++ b/yubikey-ca-java/src/main/java/me/hatter/tools/yubikeyca/YubikeyCaConstant.java
@@ -2,5 +2,5 @@ package me.hatter.tools.yubikeyca;
 
 public interface YubikeyCaConstant {
     String NAME = "yubikey-ca";
-    String VERSION = "0.2.5";
+    String VERSION = "0.2.6";
 }
diff --git a/yubikey-ca-java/src/main/java/me/hatter/tools/yubikeyca/YubikeyCaMain.java b/yubikey-ca-java/src/main/java/me/hatter/tools/yubikeyca/YubikeyCaMain.java
index 5783e40..4de31a6 100644
--- a/yubikey-ca-java/src/main/java/me/hatter/tools/yubikeyca/YubikeyCaMain.java
+++ b/yubikey-ca-java/src/main/java/me/hatter/tools/yubikeyca/YubikeyCaMain.java
@@ -1,5 +1,6 @@
 package me.hatter.tools.yubikeyca;
 
+import me.hatter.tools.commons.bytes.Bytes;
 import me.hatter.tools.commons.datetime.DateTimeUtil;
 import me.hatter.tools.commons.io.RFile;
 import me.hatter.tools.commons.log.LogConfig;
@@ -56,7 +57,8 @@ public class YubikeyCaMain {
             log.error("Intermediate CA id is required.");
             return;
         }
-        if (StringUtil.isEmpty(args.keypairType) && StringUtil.isEmpty(args.certSlot)) {
+        if (StringUtil.isEmpty(args.keypairType) && StringUtil.isEmpty(args.certFile)
+                && StringUtil.isEmpty(args.certPublicKey) && StringUtil.isEmpty(args.certSlot)) {
             log.error("Keypair type or cert slot is required.");
             return;
         }
@@ -75,6 +77,12 @@ public class YubikeyCaMain {
         if (StringUtil.isNotEmpty(args.certFile)) {
             final String certPem = RFile.from(args.certFile).string();
             publicKey = KeyUtil.parsePublicKeyPEM(certPem);
+        } else if (StringUtil.isNotEmpty(args.certPublicKey)) {
+            if (args.certPublicKey.contains("-----")) {
+                publicKey = KeyUtil.parsePublicKeyPEM(args.certPublicKey);
+            } else {
+                publicKey = KeyUtil.parsePublicKey(Bytes.fromBase64(args.certPublicKey));
+            }
         } else if (StringUtil.isNotEmpty(args.certSlot)) {
             final PivMeta certPivMeta = CardCliUtil.getPivPublicKey(args.certSlot);
             publicKey = certPivMeta.getPublicKey();