diff --git a/pom.xml b/pom.xml
index d56fcf2..479dda1 100644
--- a/pom.xml
+++ b/pom.xml
@@ -63,13 +63,13 @@
         <dependency>
             <groupId>org.json</groupId>
             <artifactId>json</artifactId>
-            <version>20160212</version>
+            <version>20190722</version>
         </dependency>
         <!-- https://mvnrepository.com/artifact/commons-cli/commons-cli -->
         <dependency>
             <groupId>commons-cli</groupId>
             <artifactId>commons-cli</artifactId>
-            <version>1.3.1</version>
+            <version>1.4</version>
         </dependency>
         <dependency>
             <groupId>org.bitcoinj</groupId>
@@ -80,12 +80,12 @@
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-simple</artifactId>
-            <version>1.7.25</version>
+            <version>1.7.29</version>
         </dependency>
         <dependency>
             <groupId>org.glassfish.jaxb</groupId>
             <artifactId>jaxb-runtime</artifactId>
-            <version>2.3.1</version>
+            <version>2.3.2</version>
             <scope>runtime</scope>
         </dependency>
 
@@ -97,7 +97,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.6.1</version>
+                <version>3.8.1</version>
                 <configuration>
                     <source>${java.specification.version}</source>
                     <target>${java.specification.version}</target>
@@ -106,7 +106,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-assembly-plugin</artifactId>
-                <version>3.0.0</version>
+                <version>3.2.0</version>
                 <executions>
                     <execution>
                         <phase>package</phase>
@@ -135,7 +135,7 @@
             <plugin>
                 <groupId>org.sonatype.plugins</groupId>
                 <artifactId>nexus-staging-maven-plugin</artifactId>
-                <version>1.6.7</version>
+                <version>1.6.8</version>
                 <extensions>true</extensions>
                 <configuration>
                     <serverId>ossrh</serverId>
@@ -146,7 +146,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-source-plugin</artifactId>
-                <version>2.2.1</version>
+                <version>3.2.0</version>
                 <executions>
                     <execution>
                         <id>attach-sources</id>
@@ -180,7 +180,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-surefire-plugin</artifactId>
-                <version>2.14</version>
+                <version>2.22.2</version>
                 <configuration>
                     <systemPropertyVariables>
                         <java.util.logging.config.file>
@@ -206,7 +206,7 @@
                     <plugin>
                         <groupId>org.apache.maven.plugins</groupId>
                         <artifactId>maven-gpg-plugin</artifactId>
-                        <version>1.5</version>
+                        <version>1.6</version>
                         <executions>
                             <execution>
                                 <id>sign-artifacts</id>