diff --git a/CHANGELOG.md b/CHANGELOG.md
index 26cde7b..d19b2ab 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # Changelog
 
-## 0.3.1 (TBD)
+## 0.3.1 (2026-07-24)
 
 - Removed the unused `androidx.lifecycle:lifecycle-runtime-ktx` dependency. In
   0.3.0 this dependency was at version 2.11.0, which forced consumers with any
@@ -11,6 +11,12 @@
 - Removed the unused `kotlinx-coroutines-android` dependency. The SDK only uses
   `Dispatchers.IO`, so it does not need the Android `Dispatchers.Main`
   integration this artifact provides.
+- Removed the `androidx.core:core-ktx` dependency. Its only use was the
+  `SharedPreferences.edit {}` extension, which has been replaced with the
+  equivalent framework calls. The published artifact now has no `androidx`
+  dependencies, so it no longer participates in androidx version alignment and
+  imposes no `compileSdk` or Android Gradle Plugin floor on consumers.
+  Previously `core-ktx` 1.18.0 required `compileSdk` 36 and AGP 8.9.1.
 
 ## 0.3.0 (2026-06-23)
 
diff --git a/README.md b/README.md
index 6b35dff..89a343e 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ Add the dependency to your app's `build.gradle.kts`:
 
 ```kotlin
 dependencies {
-    implementation("com.maxmind.device:device-sdk:0.3.0")
+    implementation("com.maxmind.device:device-sdk:0.3.1")
 }
 ```
 
@@ -24,7 +24,7 @@ dependencies {
 
 ```groovy
 dependencies {
-    implementation 'com.maxmind.device:device-sdk:0.3.0'
+    implementation 'com.maxmind.device:device-sdk:0.3.1'
 }
 ```
 
@@ -205,11 +205,11 @@ Documentation will be generated in `device-sdk/build/dokka/`.
 
 ## License
 
-This software is Copyright (c) 2025 by MaxMind, Inc.
+This software is Copyright (c) 2025-2026 by MaxMind, Inc.
 
 This is free software, licensed under the
 [Apache License, Version 2.0](LICENSE-APACHE) or the [MIT License](LICENSE-MIT),
-at your option. Copyright 2025 MaxMind, Inc.
+at your option. Copyright 2025-2026 MaxMind, Inc.
 
 ## Support
 
diff --git a/build.gradle.kts b/build.gradle.kts
index 14c14e5..ba265be 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -12,7 +12,7 @@ plugins {
 
 allprojects {
     group = "com.maxmind.device"
-    version = "0.3.0"
+    version = "0.3.1"
 }
 
 tasks.register("clean", Delete::class) {
diff --git a/device-sdk/build.gradle.kts b/device-sdk/build.gradle.kts
index 738c95e..11ca3d7 100644
--- a/device-sdk/build.gradle.kts
+++ b/device-sdk/build.gradle.kts
@@ -78,9 +78,6 @@ dependencies {
     implementation(libs.kotlinx.coroutines.core)
     implementation(libs.kotlinx.serialization.json)
 
-    // AndroidX
-    implementation(libs.androidx.core.ktx)
-
     // Networking
     implementation(libs.bundles.ktor)
 
@@ -173,7 +170,7 @@ signing {
 // API compatibility checking with japicmp
 // Compares the current build against the latest released version on Maven Central
 // Update this version after each release (the release script should do this automatically)
-val baselineVersion = "0.3.0"
+val baselineVersion = "0.3.1"
 
 // Download baseline AAR directly from Maven Central to avoid local project resolution
 val downloadBaselineAar by tasks.registering {
diff --git a/device-sdk/src/main/java/com/maxmind/device/storage/StoredIDStorage.kt b/device-sdk/src/main/java/com/maxmind/device/storage/StoredIDStorage.kt
index c4f742f..4dc1509 100644
--- a/device-sdk/src/main/java/com/maxmind/device/storage/StoredIDStorage.kt
+++ b/device-sdk/src/main/java/com/maxmind/device/storage/StoredIDStorage.kt
@@ -2,7 +2,6 @@ package com.maxmind.device.storage
 
 import android.content.Context
 import android.content.SharedPreferences
-import androidx.core.content.edit
 
 /**
  * Manages persistent storage of server-generated stored IDs.
@@ -33,14 +32,14 @@ internal class StoredIDStorage(
      * @param id The stored ID to save (format: "{uuid}:{hmac}")
      */
     fun save(id: String) {
-        prefs.edit { putString(KEY_STORED_ID, id) }
+        prefs.edit().putString(KEY_STORED_ID, id).apply()
     }
 
     /**
      * Clears the stored ID.
      */
     fun clear() {
-        prefs.edit { remove(KEY_STORED_ID) }
+        prefs.edit().remove(KEY_STORED_ID).apply()
     }
 
     internal companion object {
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 1d3461d..6b78982 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -11,7 +11,6 @@ serialization = "1.11.0"
 
 # Android
 androidGradlePlugin = "8.13.1"
-androidxCore = "1.18.0"
 androidxAppCompat = "1.7.1"
 androidxLifecycle = "2.11.0"
 
@@ -49,7 +48,6 @@ kotlinx-coroutines-android = { module = "org.jetbrains.kotlinx:kotlinx-coroutine
 kotlinx-serialization-json = { module = "org.jetbrains.kotlinx:kotlinx-serialization-json", version.ref = "serialization" }
 
 # AndroidX
-androidx-core-ktx = { module = "androidx.core:core-ktx", version.ref = "androidxCore" }
 androidx-appcompat = { module = "androidx.appcompat:appcompat", version.ref = "androidxAppCompat" }
 androidx-lifecycle-runtime-ktx = { module = "androidx.lifecycle:lifecycle-runtime-ktx", version.ref = "androidxLifecycle" }