diff --git a/pom.xml b/pom.xml
index ee69c41e..3e857f4c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -70,9 +70,9 @@
             <version>2.4.4</version>
         </dependency>
         <dependency>
-            <groupId>commons-httpclient</groupId>
-            <artifactId>commons-httpclient</artifactId>
-            <version>3.1</version>
+            <groupId>org.apache.httpcomponents</groupId>
+            <artifactId>httpclient</artifactId>
+            <version>4.3.2</version>
         </dependency>
         <dependency>
             <groupId>org.json</groupId>
diff --git a/src/test/java/jenkins/plugins/slack/HttpClientStub.java b/src/test/java/jenkins/plugins/slack/HttpClientStub.java
deleted file mode 100644
index f6de0935..00000000
--- a/src/test/java/jenkins/plugins/slack/HttpClientStub.java
+++ /dev/null
@@ -1,34 +0,0 @@
-package jenkins.plugins.slack;
-
-import org.apache.commons.httpclient.HttpClient;
-import org.apache.commons.httpclient.HttpMethod;
-import org.apache.commons.httpclient.HttpStatus;
-
-public class HttpClientStub extends HttpClient {
-
-    private int numberOfCallsToExecuteMethod;
-    private int httpStatus;
-    private boolean failAlternateResponses = false;
-
-    @Override
-    public int executeMethod(HttpMethod httpMethod) {
-        numberOfCallsToExecuteMethod++;
-        if (failAlternateResponses && (numberOfCallsToExecuteMethod % 2 == 0)) {
-            return HttpStatus.SC_NOT_FOUND;
-        } else {
-            return httpStatus;
-        }
-    }
-
-    public int getNumberOfCallsToExecuteMethod() {
-        return numberOfCallsToExecuteMethod;
-    }
-
-    public void setHttpStatus(int httpStatus) {
-        this.httpStatus = httpStatus;
-    }
-
-    public void setFailAlternateResponses(boolean failAlternateResponses) {
-        this.failAlternateResponses = failAlternateResponses;
-    }
-}