diff --git a/bitcoin/bitcoin-demo/pom.xml b/bitcoin/bitcoin-demo/pom.xml
index f127978..b0ca2c4 100644
--- a/bitcoin/bitcoin-demo/pom.xml
+++ b/bitcoin/bitcoin-demo/pom.xml
@@ -66,7 +66,7 @@
         <dependency>
             <groupId>org.apache.httpcomponents</groupId>
             <artifactId>httpclient</artifactId>
-            <version>4.5.6</version>
+            <version>4.5.13</version>
         </dependency>
 
         <!-- https://mvnrepository.com/artifact/org.web3j/core -->