diff --git a/app/proprietary/build.gradle b/app/proprietary/build.gradle
index 0f83a64fbb..394779a8b0 100644
--- a/app/proprietary/build.gradle
+++ b/app/proprietary/build.gradle
@@ -7,6 +7,10 @@ configurations {
     h2Migration
 }
 
+def h2RuntimeVersion = '2.4.240'
+def h2MigrationVersion = '2.3.232'
+def h2VersionsLockFile = rootProject.file('gradle/h2-versions.lock')
+
 bootRun {
     enabled = false
 }
@@ -62,8 +66,8 @@ dependencies {
     api "io.jsonwebtoken:jjwt-api:${jwtVersion}"
     runtimeOnly "io.jsonwebtoken:jjwt-impl:${jwtVersion}"
     runtimeOnly "io.jsonwebtoken:jjwt-jackson:${jwtVersion}"
-    runtimeOnly 'com.h2database:h2:2.4.240' // Don't upgrade h2database
-    h2Migration 'com.h2database:h2:2.3.232'
+    runtimeOnly "com.h2database:h2:${h2RuntimeVersion}"
+    h2Migration "com.h2database:h2:${h2MigrationVersion}"
     runtimeOnly 'org.postgresql:postgresql:42.7.11'
     implementation('com.coveo:saml-client:5.0.0') {
         exclude group: 'org.opensaml', module: 'opensaml-core'
@@ -91,6 +95,63 @@ tasks.named('processResources') {
     }
 }
 
+tasks.named('processTestResources') {
+    from(h2VersionsLockFile)
+}
+
+tasks.register('verifyH2VersionsLocked') {
+    group = 'verification'
+    description = 'Verifies that the resolved H2 versions match the reviewed compatibility lock.'
+    inputs.file(h2VersionsLockFile)
+    inputs.property('runtimeVersion', h2RuntimeVersion)
+    inputs.property('migrationVersion', h2MigrationVersion)
+
+    doLast {
+        if (!h2VersionsLockFile.isFile()) {
+            throw new GradleException("Missing H2 compatibility lock: ${h2VersionsLockFile}")
+        }
+
+        Map<String, String> lockedVersions = h2VersionsLockFile.readLines('UTF-8')
+                .findAll { line -> !line.isBlank() && !line.startsWith('#') }
+                .collectEntries { line ->
+                    def parts = line.split('=', 2)
+                    if (parts.length != 2 || parts[0].isBlank() || parts[1].isBlank()) {
+                        throw new GradleException("Invalid H2 compatibility lock entry: ${line}")
+                    }
+                    [(parts[0]): parts[1]]
+                }
+
+        Map<String, String> declaredVersions = [
+            runtime: h2RuntimeVersion,
+            migration: h2MigrationVersion,
+        ]
+        if (lockedVersions != declaredVersions) {
+            throw new GradleException(
+                    "H2 dependency versions changed without updating ${h2VersionsLockFile}. "
+                    + "Run the H2 migration tests and explicitly review the compatibility lock. "
+                    + "Expected ${lockedVersions}, declared ${declaredVersions}.")
+        }
+
+        Map<String, String> resolvedVersions = [
+            runtime: configurations.runtimeClasspath.resolvedConfiguration.resolvedArtifacts
+                    .find { artifact -> artifact.moduleVersion.id.group == 'com.h2database' && artifact.name == 'h2' }
+                    ?.moduleVersion?.id?.version,
+            migration: configurations.h2Migration.resolvedConfiguration.resolvedArtifacts
+                    .find { artifact -> artifact.moduleVersion.id.group == 'com.h2database' && artifact.name == 'h2' }
+                    ?.moduleVersion?.id?.version,
+        ]
+        if (resolvedVersions != declaredVersions) {
+            throw new GradleException(
+                    "Resolved H2 versions do not match the reviewed compatibility lock. "
+                    + "Expected ${declaredVersions}, resolved ${resolvedVersions}.")
+        }
+    }
+}
+
+tasks.named('check') {
+    dependsOn(tasks.named('verifyH2VersionsLocked'))
+}
+
 tasks.register('prepareKotlinBuildScriptModel') {}
 
 tasks.register('type3SignatureTool', JavaExec) {
diff --git a/app/proprietary/src/test/java/stirling/software/proprietary/security/migration/H2VersionCompatibilityTest.java b/app/proprietary/src/test/java/stirling/software/proprietary/security/migration/H2VersionCompatibilityTest.java
new file mode 100644
index 0000000000..72bd8332b0
--- /dev/null
+++ b/app/proprietary/src/test/java/stirling/software/proprietary/security/migration/H2VersionCompatibilityTest.java
@@ -0,0 +1,64 @@
+package stirling.software.proprietary.security.migration;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.sql.DriverManager;
+import java.util.Properties;
+import java.util.jar.Attributes;
+import java.util.jar.JarInputStream;
+
+import org.junit.jupiter.api.Test;
+
+class H2VersionCompatibilityTest {
+
+    private static final String H2_VERSIONS_LOCK_RESOURCE = "h2-versions.lock";
+    private static final String OLD_H2_RESOURCE = "h2-migration/h2-2.3.232.jar";
+
+    @Test
+    void runtimeAndMigrationDriverMatchTheReviewedCompatibilityLock() throws Exception {
+        Properties lockedVersions = readLockedVersions();
+
+        assertThat(runtimeH2Version()).isEqualTo(lockedVersions.getProperty("runtime"));
+        assertThat(migrationDriverVersion()).isEqualTo(lockedVersions.getProperty("migration"));
+    }
+
+    private Properties readLockedVersions() throws IOException {
+        try (InputStream resource =
+                H2VersionCompatibilityTest.class
+                        .getClassLoader()
+                        .getResourceAsStream(H2_VERSIONS_LOCK_RESOURCE)) {
+            assertThat(resource).as("H2 compatibility lock resource").isNotNull();
+            Properties versions = new Properties();
+            versions.load(resource);
+            assertThat(versions).containsKeys("runtime", "migration");
+            return versions;
+        }
+    }
+
+    private String runtimeH2Version() throws Exception {
+        try (var connection = DriverManager.getConnection("jdbc:h2:mem:h2VersionCompatibility")) {
+            try (var statement = connection.prepareStatement("SELECT H2VERSION() FROM DUAL")) {
+                try (var result = statement.executeQuery()) {
+                    assertThat(result.next()).isTrue();
+                    return result.getString(1);
+                }
+            }
+        }
+    }
+
+    private String migrationDriverVersion() throws IOException {
+        InputStream resource =
+                H2VersionCompatibilityTest.class
+                        .getClassLoader()
+                        .getResourceAsStream(OLD_H2_RESOURCE);
+        assertThat(resource).as("bundled H2 migration driver").isNotNull();
+        try (resource;
+                JarInputStream jar = new JarInputStream(resource)) {
+            return jar.getManifest()
+                    .getMainAttributes()
+                    .getValue(Attributes.Name.IMPLEMENTATION_VERSION);
+        }
+    }
+}
diff --git a/gradle/h2-versions.lock b/gradle/h2-versions.lock
new file mode 100644
index 0000000000..06b85e2f4e
--- /dev/null
+++ b/gradle/h2-versions.lock
@@ -0,0 +1,3 @@
+# H2 versions reviewed with the migration and restore-safety tests.
+runtime=2.4.240
+migration=2.3.232