diff --git a/changelog.md b/changelog.md
index b21da333..42a19a6b 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## v1.3.2
+
+### March 28, 2024
+
+- Fix:
+    - fixed null content type issue
+
 ## v1.3.1
 
 ### Feb 22, 2024
diff --git a/pom.xml b/pom.xml
index 17bbc160..9ed6e771 100644
--- a/pom.xml
+++ b/pom.xml
@@ -7,7 +7,7 @@
     <artifactId>cms</artifactId>
     <packaging>jar</packaging>
     <name>contentstack-management-java</name>
-    <version>1.3.1</version>
+    <version>1.3.2</version>
     <description>Contentstack Java Management SDK for Content Management API, Contentstack is a headless CMS with an
         API-first approach
     </description>
@@ -177,7 +177,11 @@
             <version>1.1.1</version>
             <scope>compile</scope>
         </dependency>
-
+        <dependency>
+            <groupId>javax.activation</groupId>
+            <artifactId>activation</artifactId>
+            <version>1.1.1</version>
+        </dependency>
     </dependencies>
 
 
diff --git a/src/main/java/com/contentstack/cms/stack/FileUploader.java b/src/main/java/com/contentstack/cms/stack/FileUploader.java
index df0f6d16..8b28c150 100644
--- a/src/main/java/com/contentstack/cms/stack/FileUploader.java
+++ b/src/main/java/com/contentstack/cms/stack/FileUploader.java
@@ -6,9 +6,11 @@
 
 import java.io.File;
 import java.io.IOException;
-import java.nio.file.Files;
+import java.nio.file.Paths;
 import java.util.Objects;
 
+import javax.activation.MimetypesFileTypeMap;
+
 public class FileUploader {
 
 
@@ -49,7 +51,9 @@ private void addFormDataPartIfNotNull(MultipartBody.Builder builder, String name
     // Helper method to get content type of file
     private String getContentType(File file) {
         try {
-            return Files.probeContentType(file.toPath());
+            java.nio.file.Path source = Paths.get(file.toString());
+            MimetypesFileTypeMap m = new MimetypesFileTypeMap(source.toString());
+            return m.getContentType(file);
         } catch (IOException e) {
             throw new RuntimeException("Failed to determine content type of file", e);
         }
diff --git a/src/main/java/com/contentstack/cms/stack/Merge.java b/src/main/java/com/contentstack/cms/stack/Merge.java
index e95f7272..7632340c 100644
--- a/src/main/java/com/contentstack/cms/stack/Merge.java
+++ b/src/main/java/com/contentstack/cms/stack/Merge.java
@@ -41,7 +41,7 @@
  * @author ***REMOVED***
  * @version v1.0.0
  * @see <a href=
- * "https://stag-www.contentstack.com/docs/developers/apis/content-management-api/#merge-branches">Merge
+ * "https://www.contentstack.com/docs/developers/apis/content-management-api/#merge-branches">Merge
  * Branches </a>
  * @since 2023 -June-30
  */
@@ -128,7 +128,7 @@ public Call<ResponseBody> branch(@NotNull String compareBranch, JSONObject reque
      *
      * @return the call
      * @see <a href=
-     * "https://stag-www.contentstack.com/docs/developers/apis/content-management-api/#get-all-merge-jobs"></a>Get
+     * "https://www.contentstack.com/docs/developers/apis/content-management-api/#get-all-merge-jobs"></a>Get
      * all
      * Merge Jobs
      */
@@ -144,7 +144,7 @@ public Call<ResponseBody> find() {
      * @param mergeJobUid the key of the header to be added
      * @return the call
      * @see <a href=
-     * "https://stag-www.contentstack.com/docs/developers/apis/content-management-api/#get-single-merge-job"></a>Get
+     * "https://www.contentstack.com/docs/developers/apis/content-management-api/#get-single-merge-job"></a>Get
      * a
      * Single Merge Job
      */