diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 3f4af329..99ef27de 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -25,7 +25,7 @@ your PR.
   On a *_nix_ system, run the `dev-branch.sh` script to create a new development
   branch. For example:
   ```shell
-    ./dev-branch 0.3.1
+    ./dev-branch.sh 0.3.1
   ```
   The script will create a branch `0.3.1` and update the project to version
   `0.3.1-SNAPSHOT`. For those who work on a Windows system, you'll have to do
diff --git a/README.md b/README.md
index 46efe44c..f0dcac56 100644
--- a/README.md
+++ b/README.md
@@ -67,7 +67,7 @@ Including the library in `pom.xml`
 <dependency>
     <groupId>com.appsflyer</groupId>
     <artifactId>donkey</artifactId>
-    <version>0.5.2</version>
+    <version>0.5.3-SNAPSHOT</version>
 </dependency>
 ```
 
diff --git a/pom.xml b/pom.xml
index edc46be8..a87da840 100644
--- a/pom.xml
+++ b/pom.xml
@@ -25,7 +25,7 @@
     <description>Clojure Server and Client</description>
     <groupId>com.appsflyer</groupId>
     <artifactId>donkey</artifactId>
-    <version>0.5.2</version>
+    <version>0.5.3-SNAPSHOT</version>
     <packaging>clojure</packaging>
     <url>https://github.com/AppsFlyer/donkey</url>
     <inceptionYear>2020</inceptionYear>
diff --git a/src/main/java/com/appsflyer/donkey/server/ring/handler/RingResponseAdapter.java b/src/main/java/com/appsflyer/donkey/server/ring/handler/RingResponseAdapter.java
index 3bb993c4..1fb3cc74 100644
--- a/src/main/java/com/appsflyer/donkey/server/ring/handler/RingResponseAdapter.java
+++ b/src/main/java/com/appsflyer/donkey/server/ring/handler/RingResponseAdapter.java
@@ -19,6 +19,7 @@
 
 import clojure.lang.IMapEntry;
 import clojure.lang.IPersistentMap;
+import clojure.lang.LazySeq;
 import io.vertx.core.http.HttpServerResponse;
 import io.vertx.ext.web.RoutingContext;
 import org.slf4j.Logger;
@@ -60,7 +61,11 @@ private void addHeaders(HttpServerResponse serverResponse, IPersistentMap ringRe
     if (headers != null) {
       for (var obj : headers) {
         var pair = (IMapEntry) obj;
-        serverResponse.putHeader((CharSequence) pair.getKey(), (CharSequence) pair.getValue());
+        if (pair.getValue() instanceof clojure.lang.LazySeq)
+            serverResponse.putHeader((CharSequence) pair.getKey(),
+                                     (CharSequence) ((clojure.lang.LazySeq) pair.getValue()).first());
+        else
+            serverResponse.putHeader((CharSequence) pair.getKey(), (CharSequence) pair.getValue());
       }
     }
   }