diff --git a/CHANGELOG.md b/CHANGELOG.md
index aa628af5..0799b303 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,9 +1,12 @@
 CHANGELOG
 =========
 
-5.1.0 (unreleased)
+5.1.0 (2026-05-12)
 ------------------
 
+* Updated `maxmind-db` dependency to 4.1.0. This release fixes an issue with
+  unbounded off-heap memory growth when using `FileMode.MEMORY` and a latent
+  short-read bug when loading databases larger than 2GB into memory.
 * Added `WebServiceClient.Builder.maxRetries(int)` to bound transport-failure
   retries (default 1; set 0 to disable). See the README for retry semantics.
   **Behavior change:** previously, transient transport failures (connection
diff --git a/README.md b/README.md
index e72907eb..78bfe7e7 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ To do this, add the dependency to your pom.xml:
     <dependency>
         <groupId>com.maxmind.geoip2</groupId>
         <artifactId>geoip2</artifactId>
-        <version>5.0.2</version>
+        <version>5.1.0</version>
     </dependency>
 ```
 
@@ -30,7 +30,7 @@ repositories {
     mavenCentral()
 }
 dependencies {
-    implementation 'com.maxmind.geoip2:geoip2:5.0.2'
+    implementation 'com.maxmind.geoip2:geoip2:5.1.0'
 }
 ```
 
diff --git a/mise.lock b/mise.lock
index 0145b93f..05c091e5 100644
--- a/mise.lock
+++ b/mise.lock
@@ -1,7 +1,7 @@
 # @generated - this file is auto-generated by `mise lock` https://mise.jdx.dev/dev-tools/mise-lock.html
 
 [[tools.java]]
-version = "26.0.0"
+version = "26.0.1"
 backend = "core:java"
 
 [[tools.maven]]
diff --git a/pom.xml b/pom.xml
index 1076c23e..6eb4d78c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -3,7 +3,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.maxmind.geoip2</groupId>
     <artifactId>geoip2</artifactId>
-    <version>5.0.2</version>
+    <version>5.1.0</version>
     <packaging>jar</packaging>
     <name>MaxMind GeoIP2 API</name>
     <description>GeoIP2 webservice client and database reader</description>
@@ -53,7 +53,7 @@
         <dependency>
             <groupId>com.maxmind.db</groupId>
             <artifactId>maxmind-db</artifactId>
-            <version>4.0.2</version>
+            <version>4.1.0</version>
         </dependency>
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
@@ -103,7 +103,7 @@
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <!-- Baseline version for API compatibility checking. Update after each release. -->
-        <japicmp.baselineVersion>5.0.2</japicmp.baselineVersion>
+        <japicmp.baselineVersion>5.1.0</japicmp.baselineVersion>
     </properties>
     <build>
         <plugins>