diff --git a/core/pom.xml b/core/pom.xml
index f34b8e92e..02f1a09f1 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -242,6 +242,16 @@
             <artifactId>spring-web</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-context</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-context-support</artifactId>
+            <scope>test</scope>
+        </dependency>
 
         <dependency>
             <groupId>junit</groupId>
diff --git a/core/src/test/java/org/apache/struts2/result/PlainResultTest.java b/core/src/test/java/org/apache/struts2/result/PlainResultTest.java
index 3c4264f72..995e1aac1 100644
--- a/core/src/test/java/org/apache/struts2/result/PlainResultTest.java
+++ b/core/src/test/java/org/apache/struts2/result/PlainResultTest.java
@@ -58,7 +58,7 @@ public class PlainResultTest extends StrutsInternalTestCase {
         result.execute(invocation);
 
         assertEquals("{ 'value': 'test' }", response.getContentAsString());
-        assertEquals("application/json", response.getContentType());
+        assertEquals("application/json;charset=UTF-8", response.getContentType());
     }
 
     public void testWriteContentTypeCsvWithCookie() throws Exception {
@@ -72,7 +72,7 @@ public class PlainResultTest extends StrutsInternalTestCase {
         result.execute(invocation);
 
         assertEquals("name;value\nline;1\nline;2", response.getContentAsString());
-        assertEquals("text/csv", response.getContentType());
+        assertEquals("text/csv;charset=UTF-8", response.getContentType());
     }
 
     public void testHeaders() throws Exception {
@@ -146,4 +146,4 @@ public class PlainResultTest extends StrutsInternalTestCase {
 
         ActionContext.getContext().withServletResponse(response).withActionInvocation(invocation);
     }
-}
\ No newline at end of file
+}
diff --git a/plugins/portlet-mocks/pom.xml b/plugins/portlet-mocks/pom.xml
index c516946d8..806ed3284 100644
--- a/plugins/portlet-mocks/pom.xml
+++ b/plugins/portlet-mocks/pom.xml
@@ -51,6 +51,7 @@
     </dependencies>
 
     <properties>
+        <spring.platformVersion>4.3.30.RELEASE</spring.platformVersion>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
 </project>
diff --git a/plugins/portlet/pom.xml b/plugins/portlet/pom.xml
index 2c12c7c2c..47f4a58da 100644
--- a/plugins/portlet/pom.xml
+++ b/plugins/portlet/pom.xml
@@ -130,11 +130,7 @@
             <artifactId>spring-test</artifactId>
             <optional>true</optional>
         </dependency>
-        <dependency>
-            <groupId>org.springframework</groupId>
-            <artifactId>spring-webmvc-portlet</artifactId>
-            <optional>true</optional>
-        </dependency>
+
         <dependency>
             <groupId>commons-fileupload</groupId>
             <artifactId>commons-fileupload</artifactId>
@@ -143,6 +139,7 @@
     </dependencies>
 
     <properties>
+        <spring.platformVersion>4.3.30.RELEASE</spring.platformVersion>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
 
diff --git a/pom.xml b/pom.xml
index 9932e54e2..83015b061 100644
--- a/pom.xml
+++ b/pom.xml
@@ -115,7 +115,7 @@
         <log4j2.version>2.17.2</log4j2.version>
         <ognl.version>3.3.2</ognl.version>
         <slf4j.version>1.7.32</slf4j.version>
-        <spring.platformVersion>4.3.30.RELEASE</spring.platformVersion>
+        <spring.platformVersion>5.3.20</spring.platformVersion>
         <tiles.version>3.0.8</tiles.version>
         <tiles-request.version>1.0.7</tiles-request.version>
         <maven-surefire-plugin.version>3.0.0-M4</maven-surefire-plugin.version>
@@ -988,11 +988,6 @@
                 <artifactId>spring-core</artifactId>
                 <version>${spring.platformVersion}</version>
             </dependency>
-            <dependency>
-                <groupId>org.springframework</groupId>
-                <artifactId>spring-webmvc-portlet</artifactId>
-                <version>${spring.platformVersion}</version>
-            </dependency>
             <dependency>
                 <groupId>org.springframework</groupId>
                 <artifactId>spring-context</artifactId>