diff --git a/README.md b/README.md
index aaf15e998..e4d176bfd 100644
--- a/README.md
+++ b/README.md
@@ -36,6 +36,7 @@ Now you can try to find the secrets by means of solving the challenge offered at
 - [localhost:8080/challenge/12](http://localhost:8080/challenge/12)
 - [localhost:8080/challenge/13](http://localhost:8080/challenge/13)
 - [localhost:8080/challenge/14](http://localhost:8080/challenge/14)
+- [localhost:8080/challenge/16](http://localhost:8080/challenge/16)
 
 Note that these challenges are still very basic, and so are their explanations. Feel free to file a PR to make them look better ;-).
 
diff --git a/src/main/java/org/owasp/wrongsecrets/challenges/docker/Challenge15.java b/src/main/java/org/owasp/wrongsecrets/challenges/docker/Challenge16.java
similarity index 88%
rename from src/main/java/org/owasp/wrongsecrets/challenges/docker/Challenge15.java
rename to src/main/java/org/owasp/wrongsecrets/challenges/docker/Challenge16.java
index af137eccb..0121223c9 100644
--- a/src/main/java/org/owasp/wrongsecrets/challenges/docker/Challenge15.java
+++ b/src/main/java/org/owasp/wrongsecrets/challenges/docker/Challenge16.java
@@ -16,12 +16,12 @@
 
 @Slf4j
 @Component
-@Order(15)
-public class Challenge15 extends Challenge {
+@Order(16)
+public class Challenge16 extends Challenge {
 
     private final String dockerMountPath;
 
-    public Challenge15(ScoreCard scoreCard, @Value("${challengedockermtpath}") String dockerMountPath) {
+    public Challenge16(ScoreCard scoreCard, @Value("${challengedockermtpath}") String dockerMountPath) {
         super(scoreCard);
         this.dockerMountPath = dockerMountPath;
     }
@@ -33,7 +33,7 @@ public Spoiler spoiler() {
 
     @Override
     public boolean answerCorrect(String answer) {
-        log.info("challenge 15, actualdata: {}, answer: {}", getActualData(), answer);
+        log.info("challenge 16, actualdata: {}, answer: {}", getActualData(), answer);
         return getActualData().equals(answer);
     }
 
diff --git a/src/main/resources/explanations/challenge15.adoc b/src/main/resources/explanations/challenge16.adoc
similarity index 100%
rename from src/main/resources/explanations/challenge15.adoc
rename to src/main/resources/explanations/challenge16.adoc
diff --git a/src/main/resources/explanations/challenge15_hint.adoc b/src/main/resources/explanations/challenge16_hint.adoc
similarity index 100%
rename from src/main/resources/explanations/challenge15_hint.adoc
rename to src/main/resources/explanations/challenge16_hint.adoc
diff --git a/src/main/resources/explanations/challenge15_reason.adoc b/src/main/resources/explanations/challenge16_reason.adoc
similarity index 100%
rename from src/main/resources/explanations/challenge15_reason.adoc
rename to src/main/resources/explanations/challenge16_reason.adoc
diff --git a/src/test/java/org/owasp/wrongsecrets/challenges/docker/Challenge15Test.java b/src/test/java/org/owasp/wrongsecrets/challenges/docker/Challenge16Test.java
similarity index 87%
rename from src/test/java/org/owasp/wrongsecrets/challenges/docker/Challenge15Test.java
rename to src/test/java/org/owasp/wrongsecrets/challenges/docker/Challenge16Test.java
index a3603601b..a4f1cc036 100644
--- a/src/test/java/org/owasp/wrongsecrets/challenges/docker/Challenge15Test.java
+++ b/src/test/java/org/owasp/wrongsecrets/challenges/docker/Challenge16Test.java
@@ -15,14 +15,14 @@
 import java.nio.file.Path;
 
 @ExtendWith(MockitoExtension.class)
-class Challenge15Test {
+class Challenge16Test {
 
     @Mock
     private ScoreCard scoreCard;
 
     @Test
     void solveChallenge15WithoutFile(@TempDir Path dir) {
-        var challenge = new Challenge15(scoreCard, dir.toString());
+        var challenge = new Challenge16(scoreCard, dir.toString());
 
         Assertions.assertThat(challenge.answerCorrect("secretvalueWitFile")).isFalse();
         Assertions.assertThat(challenge.answerCorrect("if_you_see_this_please_use_docker_instead")).isTrue();
@@ -34,7 +34,7 @@ void solveChallenge15WithMNTFile(@TempDir Path dir) throws Exception {
         var secret = "secretvalueWitFile";
         Files.writeString(testFile.toPath(), secret);
 
-        var challenge = new Challenge15(scoreCard, dir.toString());
+        var challenge = new Challenge16(scoreCard, dir.toString());
 
         Assertions.assertThat(challenge.answerCorrect("secretvalueWitFile")).isTrue();
     }
@@ -45,7 +45,7 @@ void spoilShouldReturnCorrectAnswer(@TempDir Path dir) throws IOException {
         var secret = "secretvalueWitFile";
         Files.writeString(testFile.toPath(), secret);
 
-        var challenge = new Challenge15(scoreCard, dir.toString());
+        var challenge = new Challenge16(scoreCard, dir.toString());
 
         Assertions.assertThat(challenge.spoiler()).isEqualTo(new Spoiler("secretvalueWitFile"));
     }