diff --git a/build.gradle b/build.gradle
index 76b7056..ec3feeb 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,19 +5,27 @@ plugins {
 group 'org.pgpainless'
 version '0.1.0-SNAPSHOT'
 
+apply from: 'version.gradle'
+
 repositories {
     mavenCentral()
+    mavenLocal()
 }
 
 dependencies {
-    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.1'
-    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.1'
+    testImplementation "org.junit.jupiter:junit-jupiter-api:$junitVersion"
+    testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:$junitVersion"
 
     // CLI
-    implementation 'info.picocli:picocli:4.6.3'
+    implementation "info.picocli:picocli:$picocliVersion"
 
-    // PGPainless
-    implementation "org.pgpainless:pgpainless-core:1.1.2"
+    implementation "org.pgpainless:pgpainless-cli:$pgpainlessVersion"
+    implementation "org.pgpainless:sop-java-picocli:$sopJavaVersion"
+    implementation ("org.pgpainless:wkd-java-cli:$wkdVersion") {
+        exclude group:'rg.slf4j', module:'slf4j-nop'
+    }
+    implementation "org.pgpainless:vks-java-cli:$vksVersion"
+    implementation "org.pgpainless:pgpainless-cert-d-cli:$certDPgpainlessVersion"
 }
 
 application {
diff --git a/src/main/java/org/pgpainless/pgpeasy/PGPeasy.java b/src/main/java/org/pgpainless/pgpeasy/PGPeasy.java
index 8b10ad3..7ecff0b 100644
--- a/src/main/java/org/pgpainless/pgpeasy/PGPeasy.java
+++ b/src/main/java/org/pgpainless/pgpeasy/PGPeasy.java
@@ -1,28 +1,55 @@
 package org.pgpainless.pgpeasy;
 
-import org.pgpainless.pgpeasy.commands.Cert;
-import org.pgpainless.pgpeasy.commands.Decrypt;
-import org.pgpainless.pgpeasy.commands.Encrypt;
-import org.pgpainless.pgpeasy.commands.Key;
+import org.pgpainless.cli.PGPainlessCLI;
 import org.pgpainless.pgpeasy.commands.Packet;
-import org.pgpainless.pgpeasy.commands.Sign;
-import org.pgpainless.pgpeasy.commands.Verify;
-import org.pgpainless.pgpeasy.commands.WKD;
 import org.pgpainless.pgpeasy.commands.WOT;
+import org.pgpainless.sop.SOPImpl;
+import pgp.cert_d.cli.PGPCertDCli;
+import pgp.vks.client.cli.VKSCLI;
+import pgp.wkd.cli.WKDCLI;
 import picocli.AutoComplete;
 import picocli.CommandLine;
+import sop.cli.picocli.SopCLI;
+import sop.cli.picocli.commands.ArmorCmd;
+import sop.cli.picocli.commands.DearmorCmd;
+import sop.cli.picocli.commands.DecryptCmd;
+import sop.cli.picocli.commands.DetachInbandSignatureAndMessageCmd;
+import sop.cli.picocli.commands.EncryptCmd;
+import sop.cli.picocli.commands.ExtractCertCmd;
+import sop.cli.picocli.commands.GenerateKeyCmd;
+import sop.cli.picocli.commands.SignCmd;
+import sop.cli.picocli.commands.VerifyCmd;
 
 @CommandLine.Command(
         subcommands = {
-                Encrypt.class,
-                Decrypt.class,
-                Sign.class,
-                Verify.class,
-                Key.class,
-                Cert.class,
-                Packet.class,
-                WKD.class,
+                // Inherit from SOP
+                EncryptCmd.class,
+                DecryptCmd.class,
+                SignCmd.class,
+                VerifyCmd.class,
+                ArmorCmd.class,
+                DearmorCmd.class,
+                ExtractCertCmd.class,
+                GenerateKeyCmd.class,
+                DetachInbandSignatureAndMessageCmd.class,
+
+                // SOP as subcommand
+                SopCLI.class,
+
+                // WKD
+                WKDCLI.class,
+
+                // VKS
+                VKSCLI.class,
+
+                // PGP-Cert-D
+                PGPCertDCli.class,
+
+                // PGPeasy
                 WOT.class,
+                Packet.class,
+
+                // Picocli
                 CommandLine.HelpCommand.class,
                 AutoComplete.GenerateCompletion.class
         }
@@ -30,6 +57,7 @@ import picocli.CommandLine;
 public class PGPeasy {
 
     public static void main(String[] args) {
+        SopCLI.setSopInstance(new SOPImpl());
         int exitCode = execute(args);
         if (exitCode != 0) {
             System.exit(exitCode);
@@ -37,10 +65,13 @@ public class PGPeasy {
     }
 
     public static int execute(String[] args) {
-        return new CommandLine(PGPeasy.class)
+        CommandLine cmd = new CommandLine(PGPeasy.class);
+        // Hide generate-completion command
+        CommandLine gen = cmd.getSubcommands().get("generate-completion");
+        gen.getCommandSpec().usageMessage().hidden(true);
+
+        return cmd
                 .setCommandName("pgpeasy")
-                // .setExecutionExceptionHandler(new SOPExecutionExceptionHandler())
-                // .setExitCodeExceptionMapper(new SOPExceptionExitCodeMapper())
                 .setCaseInsensitiveEnumValuesAllowed(true)
                 .execute(args);
     }
diff --git a/src/main/java/org/pgpainless/pgpeasy/commands/Cert.java b/src/main/java/org/pgpainless/pgpeasy/commands/Cert.java
deleted file mode 100644
index ef26456..0000000
--- a/src/main/java/org/pgpainless/pgpeasy/commands/Cert.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package org.pgpainless.pgpeasy.commands;
-
-import org.pgpainless.pgpeasy.commands.cert.Certify;
-import org.pgpainless.pgpeasy.commands.key.ExtractCert;
-import picocli.CommandLine;
-
-@CommandLine.Command(
-        name = "cert",
-        description = "Execute operations related to OpenPGP certificates",
-        subcommands = {
-                ExtractCert.class,
-                Certify.class
-        }
-)
-public class Cert implements Runnable {
-
-    @Override
-    public void run() {
-
-    }
-}
diff --git a/src/main/java/org/pgpainless/pgpeasy/commands/Decrypt.java b/src/main/java/org/pgpainless/pgpeasy/commands/Decrypt.java
deleted file mode 100644
index e824935..0000000
--- a/src/main/java/org/pgpainless/pgpeasy/commands/Decrypt.java
+++ /dev/null
@@ -1,15 +0,0 @@
-package org.pgpainless.pgpeasy.commands;
-
-import picocli.CommandLine;
-
-@CommandLine.Command(
-        name = "decrypt",
-        description = "Decrypt a message"
-)
-public class Decrypt implements Runnable {
-
-    @Override
-    public void run() {
-
-    }
-}
diff --git a/src/main/java/org/pgpainless/pgpeasy/commands/Encrypt.java b/src/main/java/org/pgpainless/pgpeasy/commands/Encrypt.java
deleted file mode 100644
index aedca8b..0000000
--- a/src/main/java/org/pgpainless/pgpeasy/commands/Encrypt.java
+++ /dev/null
@@ -1,14 +0,0 @@
-package org.pgpainless.pgpeasy.commands;
-
-import picocli.CommandLine;
-
-@CommandLine.Command(
-        name = "encrypt",
-        description = "Encrypt a message"
-)
-public class Encrypt implements Runnable {
-    @Override
-    public void run() {
-        System.out.println("Not yet implemented.");
-    }
-}
diff --git a/src/main/java/org/pgpainless/pgpeasy/commands/Key.java b/src/main/java/org/pgpainless/pgpeasy/commands/Key.java
deleted file mode 100644
index 347ba30..0000000
--- a/src/main/java/org/pgpainless/pgpeasy/commands/Key.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package org.pgpainless.pgpeasy.commands;
-
-import org.pgpainless.pgpeasy.commands.key.ExtractCert;
-import org.pgpainless.pgpeasy.commands.key.Generate;
-import picocli.CommandLine;
-
-@CommandLine.Command(
-        name = "key",
-        description = "Operations related to secret keys",
-        subcommands = {
-                ExtractCert.class,
-                Generate.class,
-        }
-)
-public class Key implements Runnable {
-
-    @Override
-    public void run() {
-
-    }
-}
diff --git a/src/main/java/org/pgpainless/pgpeasy/commands/Sign.java b/src/main/java/org/pgpainless/pgpeasy/commands/Sign.java
deleted file mode 100644
index 86e3b1a..0000000
--- a/src/main/java/org/pgpainless/pgpeasy/commands/Sign.java
+++ /dev/null
@@ -1,15 +0,0 @@
-package org.pgpainless.pgpeasy.commands;
-
-import picocli.CommandLine;
-
-@CommandLine.Command(
-        name = "sign",
-        description = "Sign a message"
-)
-public class Sign implements Runnable {
-
-    @Override
-    public void run() {
-
-    }
-}
diff --git a/src/main/java/org/pgpainless/pgpeasy/commands/Verify.java b/src/main/java/org/pgpainless/pgpeasy/commands/Verify.java
deleted file mode 100644
index b7a19a9..0000000
--- a/src/main/java/org/pgpainless/pgpeasy/commands/Verify.java
+++ /dev/null
@@ -1,15 +0,0 @@
-package org.pgpainless.pgpeasy.commands;
-
-import picocli.CommandLine;
-
-@CommandLine.Command(
-        name = "verify",
-        description = "Verify a signed message."
-)
-public class Verify implements Runnable {
-
-    @Override
-    public void run() {
-
-    }
-}
diff --git a/src/main/java/org/pgpainless/pgpeasy/commands/WKD.java b/src/main/java/org/pgpainless/pgpeasy/commands/WKD.java
deleted file mode 100644
index 4d42bea..0000000
--- a/src/main/java/org/pgpainless/pgpeasy/commands/WKD.java
+++ /dev/null
@@ -1,19 +0,0 @@
-package org.pgpainless.pgpeasy.commands;
-
-import org.pgpainless.pgpeasy.commands.wkd.Fetch;
-import picocli.CommandLine;
-
-@CommandLine.Command(
-        name = "wkd",
-        description = "Interact with the Web Key Directory",
-        subcommands = {
-                Fetch.class,
-        }
-)
-public class WKD implements Runnable {
-
-    @Override
-    public void run() {
-
-    }
-}
diff --git a/src/main/java/org/pgpainless/pgpeasy/commands/cert/Certify.java b/src/main/java/org/pgpainless/pgpeasy/commands/cert/Certify.java
deleted file mode 100644
index 5aa5108..0000000
--- a/src/main/java/org/pgpainless/pgpeasy/commands/cert/Certify.java
+++ /dev/null
@@ -1,15 +0,0 @@
-package org.pgpainless.pgpeasy.commands.cert;
-
-import picocli.CommandLine;
-
-@CommandLine.Command(
-        name = "certify",
-        description = "Create a signature on a certificate."
-)
-public class Certify implements Runnable {
-
-    @Override
-    public void run() {
-
-    }
-}
diff --git a/src/main/java/org/pgpainless/pgpeasy/commands/key/ExtractCert.java b/src/main/java/org/pgpainless/pgpeasy/commands/key/ExtractCert.java
deleted file mode 100644
index b812e04..0000000
--- a/src/main/java/org/pgpainless/pgpeasy/commands/key/ExtractCert.java
+++ /dev/null
@@ -1,15 +0,0 @@
-package org.pgpainless.pgpeasy.commands.key;
-
-import picocli.CommandLine;
-
-@CommandLine.Command(
-        name = "extract",
-        description = "Extract a certificate from a secret key"
-)
-public class ExtractCert implements Runnable {
-
-    @Override
-    public void run() {
-
-    }
-}
diff --git a/src/main/java/org/pgpainless/pgpeasy/commands/key/Generate.java b/src/main/java/org/pgpainless/pgpeasy/commands/key/Generate.java
deleted file mode 100644
index 7dca480..0000000
--- a/src/main/java/org/pgpainless/pgpeasy/commands/key/Generate.java
+++ /dev/null
@@ -1,15 +0,0 @@
-package org.pgpainless.pgpeasy.commands.key;
-
-import picocli.CommandLine;
-
-@CommandLine.Command(
-        name = "generate",
-        description = "Generate a new OpenPGP key"
-)
-public class Generate implements Runnable {
-
-    @Override
-    public void run() {
-
-    }
-}
diff --git a/src/main/java/org/pgpainless/pgpeasy/commands/wkd/Fetch.java b/src/main/java/org/pgpainless/pgpeasy/commands/wkd/Fetch.java
deleted file mode 100644
index af311d8..0000000
--- a/src/main/java/org/pgpainless/pgpeasy/commands/wkd/Fetch.java
+++ /dev/null
@@ -1,15 +0,0 @@
-package org.pgpainless.pgpeasy.commands.wkd;
-
-import picocli.CommandLine;
-
-@CommandLine.Command(
-        name = "fetch",
-        description = "Fetch a certificate from the Web Key Directory"
-)
-public class Fetch implements Runnable {
-
-    @Override
-    public void run() {
-
-    }
-}
diff --git a/version.gradle b/version.gradle
new file mode 100644
index 0000000..a26d37c
--- /dev/null
+++ b/version.gradle
@@ -0,0 +1,14 @@
+allprojects {
+    ext {
+        bouncyCastleVersion = '1.71'
+        slf4jVersion = '1.7.36'
+        logbackVersion = '1.2.11'
+        junitVersion = '5.8.2'
+        sopJavaVersion = '1.2.3'
+        picocliVersion = '4.6.3'
+        pgpainlessVersion = '1.2.1'
+        wkdVersion = '0.1.1'
+        vksVersion = '0.1.2'
+        certDPgpainlessVersion = '0.1.2'
+    }
+}