diff --git a/build.gradle b/build.gradle
index 8a3708a74..fbc2ff1f1 100644
--- a/build.gradle
+++ b/build.gradle
@@ -20,7 +20,7 @@ repositories {
 }
 
 dependencies {
-    testImplementation 'junit:junit:4.13.1'
+    testImplementation 'junit:junit:4.13.2'
     testImplementation 'com.jayway.jsonpath:json-path:2.1.0'
     testImplementation 'org.mockito:mockito-core:4.2.0'
 }
diff --git a/pom.xml b/pom.xml
index 720529c50..29592fcdf 100644
--- a/pom.xml
+++ b/pom.xml
@@ -57,7 +57,7 @@
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>4.13.1</version>
+            <version>4.13.2</version>
             <scope>test</scope>
         </dependency>
         <dependency>
diff --git a/src/main/java/org/json/JSONArray.java b/src/main/java/org/json/JSONArray.java
index cc9531e22..b0c912d1f 100644
--- a/src/main/java/org/json/JSONArray.java
+++ b/src/main/java/org/json/JSONArray.java
@@ -1646,9 +1646,7 @@ public String toString() {
     @SuppressWarnings("resource")
     public String toString(int indentFactor) throws JSONException {
         StringWriter sw = new StringWriter();
-        synchronized (sw.getBuffer()) {
-            return this.write(sw, indentFactor, 0).toString();
-        }
+        return this.write(sw, indentFactor, 0).toString();
     }
 
     /**
diff --git a/src/main/java/org/json/JSONObject.java b/src/main/java/org/json/JSONObject.java
index 72cdff253..acef67d9f 100644
--- a/src/main/java/org/json/JSONObject.java
+++ b/src/main/java/org/json/JSONObject.java
@@ -2183,13 +2183,11 @@ public Object optQuery(JSONPointer jsonPointer) {
     @SuppressWarnings("resource")
     public static String quote(String string) {
         StringWriter sw = new StringWriter();
-        synchronized (sw.getBuffer()) {
-            try {
-                return quote(string, sw).toString();
-            } catch (IOException ignored) {
-                // will never happen - we are writing to a string writer
-                return "";
-            }
+        try {
+            return quote(string, sw).toString();
+        } catch (IOException ignored) {
+            // will never happen - we are writing to a string writer
+            return "";
         }
     }
 
@@ -2576,9 +2574,7 @@ public String toString() {
     @SuppressWarnings("resource")
     public String toString(int indentFactor) throws JSONException {
         StringWriter w = new StringWriter();
-        synchronized (w.getBuffer()) {
-            return this.write(w, indentFactor, 0).toString();
-        }
+        return this.write(w, indentFactor, 0).toString();
     }
 
     /**