diff --git a/adapters/fabric/build.gradle b/adapters/fabric/build.gradle
index 264e015b1..903128853 100644
--- a/adapters/fabric/build.gradle
+++ b/adapters/fabric/build.gradle
@@ -56,7 +56,7 @@ apply from: file('../../gradle/volmlib-stamp.gradle')
 
 Properties rootProperties = new Properties()
 file('../../gradle.properties').withInputStream { InputStream stream -> rootProperties.load(stream) }
-String irisVersion = providers.gradleProperty('irisVersion').getOrElse(rootProperties.getProperty('irisVersion', '4.1.2-26.2'))
+String irisVersion = providers.gradleProperty('irisVersion').getOrElse(rootProperties.getProperty('irisVersion', '4.3.0-26.2'))
 String minecraftVersion = providers.gradleProperty('minecraftVersion').getOrElse(rootProperties.getProperty('minecraftVersion', '26.3'))
 String fabricLoaderVersion = providers.gradleProperty('fabricLoaderVersion').getOrElse(rootProperties.getProperty('fabricLoaderVersion', '0.19.5'))
 Closure<String> irisArtifactName = { String platform, String targetVersion ->
diff --git a/adapters/forge/build.gradle b/adapters/forge/build.gradle
index cae2d8269..6e1add753 100644
--- a/adapters/forge/build.gradle
+++ b/adapters/forge/build.gradle
@@ -56,7 +56,7 @@ apply from: file('../../gradle/volmlib-stamp.gradle')
 
 Properties rootProperties = new Properties()
 file('../../gradle.properties').withInputStream { InputStream stream -> rootProperties.load(stream) }
-String irisVersion = providers.gradleProperty('irisVersion').getOrElse(rootProperties.getProperty('irisVersion', '4.1.2-26.2'))
+String irisVersion = providers.gradleProperty('irisVersion').getOrElse(rootProperties.getProperty('irisVersion', '4.3.0-26.2'))
 String minecraftVersion = providers.gradleProperty('minecraftVersion').getOrElse(rootProperties.getProperty('minecraftVersion', '26.3'))
 String forgeVersion = providers.gradleProperty('forgeVersion').getOrElse(rootProperties.getProperty('forgeVersion', '26.3-66.0.8'))
 Closure<String> loaderDisplayVersion = { String loaderVersion ->
diff --git a/adapters/neoforge/build.gradle b/adapters/neoforge/build.gradle
index 0ffff3760..8d03ca16b 100644
--- a/adapters/neoforge/build.gradle
+++ b/adapters/neoforge/build.gradle
@@ -56,7 +56,7 @@ apply from: file('../../gradle/volmlib-stamp.gradle')
 
 Properties rootProperties = new Properties()
 file('../../gradle.properties').withInputStream { InputStream stream -> rootProperties.load(stream) }
-String irisVersion = providers.gradleProperty('irisVersion').getOrElse(rootProperties.getProperty('irisVersion', '4.1.2-26.2'))
+String irisVersion = providers.gradleProperty('irisVersion').getOrElse(rootProperties.getProperty('irisVersion', '4.3.0-26.2'))
 String minecraftVersion = providers.gradleProperty('minecraftVersion').getOrElse(rootProperties.getProperty('minecraftVersion', '26.3'))
 String neoForgeVersion = providers.gradleProperty('neoForgeVersion').getOrElse(rootProperties.getProperty('neoForgeVersion', '26.3.0.33-beta'))
 Closure<String> irisArtifactName = { String platform, String targetVersion ->
diff --git a/build.gradle b/build.gradle
index 0fb075442..9decb4507 100644
--- a/build.gradle
+++ b/build.gradle
@@ -64,7 +64,7 @@ interface IrisFileOperations {
 IrisFileOperations irisFileOperations = objects.newInstance(IrisFileOperations)
 
 group = 'art.arcane'
-version = providers.gradleProperty('irisVersion').getOrElse('4.1.2-26.2')
+version = providers.gradleProperty('irisVersion').getOrElse('4.3.0-26.2')
 
 project(':core') {
     group = 'art.arcane'
diff --git a/core/src/test/java/art/arcane/iris/world/pregen/AsyncPregenServerSaveOwnershipTest.java b/core/src/test/java/art/arcane/iris/world/pregen/AsyncPregenServerSaveOwnershipTest.java
index 446ec3bd3..45117342b 100644
--- a/core/src/test/java/art/arcane/iris/world/pregen/AsyncPregenServerSaveOwnershipTest.java
+++ b/core/src/test/java/art/arcane/iris/world/pregen/AsyncPregenServerSaveOwnershipTest.java
@@ -351,7 +351,9 @@ public class AsyncPregenServerSaveOwnershipTest {
             }
         }, 10, 1_000_000, 0, 0, 127, 0);
         fixture.set("retention", retention);
-        try (SchedulingContext context = new SchedulingContext(fixture)) {
+        try (SchedulingContext context = new SchedulingContext(fixture);
+             MockedStatic<MantleHeapPressure> pressure = mockStatic(MantleHeapPressure.class)) {
+            pressure.when(MantleHeapPressure::overHighWater).thenReturn(false);
             for (int region = 0; region < 128; region++) {
                 long key = (long) region << 32;
                 retention.retainAround(region << 5, 0);
@@ -376,7 +378,9 @@ public class AsyncPregenServerSaveOwnershipTest {
         Fixture fixture = new Fixture();
         AtomicInteger pendingChunks = new AtomicInteger(2);
         fixture.pendingRegions.put(0L, pendingChunks);
-        try (SchedulingContext context = new SchedulingContext(fixture)) {
+        try (SchedulingContext context = new SchedulingContext(fixture);
+             MockedStatic<MantleHeapPressure> pressure = mockStatic(MantleHeapPressure.class)) {
+            pressure.when(MantleHeapPressure::overHighWater).thenReturn(false);
             CompletableFuture<?> eviction = (CompletableFuture<?>) invoke(fixture.method, "evictRegion", 0L);
             eviction.get(5L, TimeUnit.SECONDS);
             assertSame(pendingChunks, fixture.pendingRegions.get(0L));
diff --git a/gradle.properties b/gradle.properties
index 46532118c..09164537f 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -21,7 +21,7 @@ org.gradle.jvmargs=-Xmx3072m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF
 org.gradle.caching=true
 org.gradle.configureondemand=false
 
-irisVersion=4.2.0-26.2
+irisVersion=4.3.0-26.2
 minecraftVersion=26.3
 # Bukkit plugin api-version: lowest supported Minecraft release line so one artifact loads on 26.1.2 through 26.3
 apiVersion=26.1