diff --git a/.gitignore b/.gitignore
index 828d6af0..3f1c943f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,6 +6,7 @@
 *.ear
 *.sw?
 *.classpath
+.claude
 .gh-pages
 .idea
 .pmd
@@ -14,6 +15,7 @@
 bin
 doc
 hs_err*.log
+pom.xml.versionsBackup
 target
 /sample/GeoLite2-City.mmdb
 /sample/run.sh
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7ddc15ff..8cbb2519 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,13 @@
 CHANGELOG
 =========
 
+4.0.1 (2025-12-02)
+------------------
+
+* `DecodedValue` is now a public class again, allowing custom `NodeCache`
+  implementations to be created. The class was inadvertently made
+  package-private in 4.0.0. Reported by Alexandros Leventakis. GitHub #321.
+
 4.0.0 (2025-11-10)
 ------------------
 
diff --git a/README.md b/README.md
index 7197ef5c..707f5a7a 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ To do this, add the dependency to your pom.xml:
     <dependency>
         <groupId>com.maxmind.db</groupId>
         <artifactId>maxmind-db</artifactId>
-        <version>4.0.0</version>
+        <version>4.0.1</version>
     </dependency>
 ```
 
@@ -29,7 +29,7 @@ repositories {
     mavenCentral()
 }
 dependencies {
-    compile 'com.maxmind.db:maxmind-db:4.0.0'
+    compile 'com.maxmind.db:maxmind-db:4.0.1'
 }
 ```
 
diff --git a/pom.xml b/pom.xml
index 57f4494e..6b3de5ef 100644
--- a/pom.xml
+++ b/pom.xml
@@ -3,7 +3,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.maxmind.db</groupId>
     <artifactId>maxmind-db</artifactId>
-    <version>4.0.0</version>
+    <version>4.0.1</version>
     <packaging>jar</packaging>
     <name>MaxMind DB Reader</name>
     <description>Reader for MaxMind DB</description>
diff --git a/src/main/java/com/maxmind/db/DecodedValue.java b/src/main/java/com/maxmind/db/DecodedValue.java
index c3174f69..5440a684 100644
--- a/src/main/java/com/maxmind/db/DecodedValue.java
+++ b/src/main/java/com/maxmind/db/DecodedValue.java
@@ -1,9 +1,16 @@
 package com.maxmind.db;
 
 /**
- * {@code DecodedValue} is a wrapper for the decoded value and the number of bytes used
- * to decode it.
- *
- * @param value the decoded value
+ * {@code DecodedValue} is a wrapper for the decoded value.
  */
-record DecodedValue(Object value) {}
+public final class DecodedValue {
+    final Object value;
+
+    DecodedValue(Object value) {
+        this.value = value;
+    }
+
+    Object value() {
+        return value;
+    }
+}