diff --git a/.github/workflows/main.linux.temurin.current.yml b/.github/workflows/main.linux.temurin.current.yml
index ddf9951f..c9b7c7bd 100644
--- a/.github/workflows/main.linux.temurin.current.yml
+++ b/.github/workflows/main.linux.temurin.current.yml
@@ -14,7 +14,7 @@ jobs:
       - name: JDK
         uses: actions/setup-java@v3
         with:
-          java-version: 20
+          java-version: 21
           distribution: 'temurin'
       - name: Build
         run: mvn --errors clean verify site
diff --git a/.github/workflows/main.linux.temurin.lts.yml b/.github/workflows/main.linux.temurin.lts.yml
index 8097a2de..1e6e9889 100644
--- a/.github/workflows/main.linux.temurin.lts.yml
+++ b/.github/workflows/main.linux.temurin.lts.yml
@@ -14,7 +14,7 @@ jobs:
       - name: JDK
         uses: actions/setup-java@v3
         with:
-          java-version: 17
+          java-version: 21
           distribution: 'temurin'
       - name: Build
         run: mvn --errors clean verify site
diff --git a/.github/workflows/main.windows.temurin.current.yml b/.github/workflows/main.windows.temurin.current.yml
index ac380632..5099ab81 100644
--- a/.github/workflows/main.windows.temurin.current.yml
+++ b/.github/workflows/main.windows.temurin.current.yml
@@ -14,7 +14,7 @@ jobs:
       - name: JDK
         uses: actions/setup-java@v3
         with:
-          java-version: 20
+          java-version: 21
           distribution: 'temurin'
       - name: Build
         run: mvn --errors clean verify site
diff --git a/.github/workflows/main.windows.temurin.lts.yml b/.github/workflows/main.windows.temurin.lts.yml
index 4c52f6b7..941f19c3 100644
--- a/.github/workflows/main.windows.temurin.lts.yml
+++ b/.github/workflows/main.windows.temurin.lts.yml
@@ -14,7 +14,7 @@ jobs:
       - name: JDK
         uses: actions/setup-java@v3
         with:
-          java-version: 17
+          java-version: 21
           distribution: 'temurin'
       - name: Build
         run: mvn --errors clean verify site
diff --git a/com.io7m.jsycamore.api/src/main/java/com/io7m/jsycamore/api/events/SyEventType.java b/com.io7m.jsycamore.api/src/main/java/com/io7m/jsycamore/api/events/SyEventType.java
index a81b0e2a..5b859afd 100644
--- a/com.io7m.jsycamore.api/src/main/java/com/io7m/jsycamore/api/events/SyEventType.java
+++ b/com.io7m.jsycamore.api/src/main/java/com/io7m/jsycamore/api/events/SyEventType.java
@@ -16,6 +16,7 @@
 
 package com.io7m.jsycamore.api.events;
 
+import com.io7m.jsycamore.api.keyboard.SyKeyEventType;
 import com.io7m.jsycamore.api.menus.SyMenuEventType;
 import com.io7m.jsycamore.api.mouse.SyMouseEventType;
 import com.io7m.jsycamore.api.windows.SyWindowEventType;
@@ -25,7 +26,7 @@
  */
 
 public sealed interface SyEventType
-  permits com.io7m.jsycamore.api.keyboard.SyKeyEventType,
+  permits SyKeyEventType,
   SyMenuEventType,
   SyMouseEventType,
   SyWindowEventType
diff --git a/com.io7m.jsycamore.awt/src/main/java/com/io7m/jsycamore/awt/internal/SyAWTNodeRenderer.java b/com.io7m.jsycamore.awt/src/main/java/com/io7m/jsycamore/awt/internal/SyAWTNodeRenderer.java
index 65643093..ce4727d3 100644
--- a/com.io7m.jsycamore.awt/src/main/java/com/io7m/jsycamore/awt/internal/SyAWTNodeRenderer.java
+++ b/com.io7m.jsycamore.awt/src/main/java/com/io7m/jsycamore/awt/internal/SyAWTNodeRenderer.java
@@ -25,9 +25,11 @@
 import com.io7m.jsycamore.api.rendering.SyPaintGradientLinear;
 import com.io7m.jsycamore.api.rendering.SyRenderNodeComposite;
 import com.io7m.jsycamore.api.rendering.SyRenderNodeImage;
+import com.io7m.jsycamore.api.rendering.SyRenderNodeNoop;
 import com.io7m.jsycamore.api.rendering.SyRenderNodeShape;
 import com.io7m.jsycamore.api.rendering.SyRenderNodeText;
 import com.io7m.jsycamore.api.rendering.SyRenderNodeType;
+import com.io7m.jsycamore.api.rendering.SyShapeComposite;
 import com.io7m.jsycamore.api.rendering.SyShapePolygon;
 import com.io7m.jsycamore.api.rendering.SyShapeRectangle;
 import com.io7m.jsycamore.api.spaces.SySpaceComponentRelativeType;
@@ -36,7 +38,7 @@
 import com.io7m.jsycamore.api.text.SyFontDirectoryType;
 import com.io7m.jsycamore.api.text.SyFontException;
 import com.io7m.jtensors.core.parameterized.vectors.PVector4D;
-import com.io7m.junreachable.UnreachableCodeException;
+import com.io7m.junreachable.UnimplementedCodeException;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -148,15 +150,14 @@ private static <T extends SySpaceType> Paint fillToPaint(
     final PAreaI<T> boundingArea,
     final SyPaintFillType fillPaint)
   {
-    if (fillPaint instanceof SyPaintFlat flat) {
-      return fillToPaintFlat(flat);
-    }
-
-    if (fillPaint instanceof SyPaintGradientLinear linear) {
-      return fillToPaintGradientLinear(boundingArea, linear);
-    }
-
-    throw new UnreachableCodeException();
+    return switch (fillPaint) {
+      case final SyPaintFlat flat -> {
+        yield fillToPaintFlat(flat);
+      }
+      case final SyPaintGradientLinear linear -> {
+        yield fillToPaintGradientLinear(boundingArea, linear);
+      }
+    };
   }
 
   private static Color toColor4(
@@ -213,11 +214,14 @@ private static <T extends SySpaceType> Paint edgeToPaint(
     final PAreaI<T> boundingArea,
     final SyPaintEdgeType edgePaint)
   {
-    if (edgePaint instanceof SyPaintFlat flat) {
-      return edgeToPaintFlat(flat);
-    }
-
-    throw new UnreachableCodeException();
+    return switch (edgePaint) {
+      case final SyPaintFlat flat -> {
+        yield edgeToPaintFlat(flat);
+      }
+      case final SyPaintGradientLinear linear -> {
+        throw new UnimplementedCodeException();
+      }
+    };
   }
 
   private static Paint edgeToPaintFlat(
@@ -276,13 +280,16 @@ private static void renderNodeShape(
     final Graphics2D g,
     final SyRenderNodeShape shape)
   {
-    if (shape.shape() instanceof SyShapeRectangle<SySpaceComponentRelativeType> rectangle) {
-      renderShapeRectangle(g, shape.edgePaint(), shape.fillPaint(), rectangle);
-      return;
-    }
-    if (shape.shape() instanceof SyShapePolygon<SySpaceComponentRelativeType> polygon) {
-      renderShapePolygon(g, shape.edgePaint(), shape.fillPaint(), polygon);
-      return;
+    switch (shape.shape()) {
+      case final SyShapeRectangle<SySpaceComponentRelativeType> r -> {
+        renderShapeRectangle(g, shape.edgePaint(), shape.fillPaint(), r);
+      }
+      case final SyShapePolygon<SySpaceComponentRelativeType> p -> {
+        renderShapePolygon(g, shape.edgePaint(), shape.fillPaint(), p);
+      }
+      case final SyShapeComposite<?> c -> {
+
+      }
     }
   }
 
@@ -322,23 +329,24 @@ public void renderNode(
     final SyRenderNodeType renderNode)
   {
     try {
-      if (renderNode instanceof SyRenderNodeShape shape) {
-        renderNodeShape(graphics2D, shape);
-        return;
-      }
-      if (renderNode instanceof SyRenderNodeText text) {
-        renderNodeText(graphics2D, this.fontDirectory, text);
-        return;
-      }
-      if (renderNode instanceof SyRenderNodeImage image) {
-        this.renderNodeImage(graphics2D, image);
-        return;
-      }
-      if (renderNode instanceof SyRenderNodeComposite composite) {
-        for (final var node : composite.nodes()) {
-          this.renderNode(graphics2D, node);
+      switch (renderNode) {
+        case final SyRenderNodeShape shape -> {
+          renderNodeShape(graphics2D, shape);
+        }
+        case final SyRenderNodeText text -> {
+          this.renderNodeText(graphics2D, this.fontDirectory, text);
+        }
+        case final SyRenderNodeImage image -> {
+          this.renderNodeImage(graphics2D, image);
+        }
+        case final SyRenderNodeComposite composite -> {
+          for (final var node : composite.nodes()) {
+            this.renderNode(graphics2D, node);
+          }
+        }
+        case final SyRenderNodeNoop noOp -> {
+
         }
-        return;
       }
     } finally {
       if (this.debugBounds) {
diff --git a/com.io7m.jsycamore.theme.spi/src/main/java/com/io7m/jsycamore/theme/spi/SyThemeValues.java b/com.io7m.jsycamore.theme.spi/src/main/java/com/io7m/jsycamore/theme/spi/SyThemeValues.java
index 4888e9fc..1ca7d6dc 100644
--- a/com.io7m.jsycamore.theme.spi/src/main/java/com/io7m/jsycamore/theme/spi/SyThemeValues.java
+++ b/com.io7m.jsycamore.theme.spi/src/main/java/com/io7m/jsycamore/theme/spi/SyThemeValues.java
@@ -447,47 +447,43 @@ private void evaluate()
     while (iterator.hasNext()) {
       final var node = iterator.next();
 
-      if (node instanceof SyValueFunctionInteger functionNode) {
-        functionNode.evaluate(
-          Optional.ofNullable(this.nodes.get(functionNode.source()))
-            .orElseThrow(UnreachableCodeException::new)
-        );
-        continue;
-      }
-
-      if (node instanceof SyValueFunctionDouble functionNode) {
-        functionNode.evaluate(
-          Optional.ofNullable(this.nodes.get(functionNode.source()))
-            .orElseThrow(UnreachableCodeException::new)
-        );
-        continue;
-      }
-
-      if (node instanceof SyValueFunctionFont functionNode) {
-        functionNode.evaluate(
-          Optional.ofNullable(this.nodes.get(functionNode.source()))
-            .orElseThrow(UnreachableCodeException::new)
-        );
-        continue;
-      }
-
-      if (node instanceof SyValueFunctionColor4D functionNode) {
-        functionNode.evaluate(
-          Optional.ofNullable(this.nodes.get(functionNode.source()))
-            .orElseThrow(UnreachableCodeException::new)
-        );
-        continue;
-      }
-
-      if (node instanceof SyConstantType) {
-        continue;
+      switch (node) {
+        case final SyValueFunctionInteger functionNode -> {
+          functionNode.evaluate(
+            Optional.ofNullable(this.nodes.get(functionNode.source()))
+              .orElseThrow(UnreachableCodeException::new)
+          );
+          continue;
+        }
+        case final SyValueFunctionDouble functionNode -> {
+          functionNode.evaluate(
+            Optional.ofNullable(this.nodes.get(functionNode.source()))
+              .orElseThrow(UnreachableCodeException::new)
+          );
+          continue;
+        }
+        case final SyValueFunctionFont functionNode -> {
+          functionNode.evaluate(
+            Optional.ofNullable(this.nodes.get(functionNode.source()))
+              .orElseThrow(UnreachableCodeException::new)
+          );
+          continue;
+        }
+        case final SyValueFunctionColor4D functionNode -> {
+          functionNode.evaluate(
+            Optional.ofNullable(this.nodes.get(functionNode.source()))
+              .orElseThrow(UnreachableCodeException::new)
+          );
+          continue;
+        }
+        case final SyConstantType syConstantType -> {
+          continue;
+        }
       }
-
-      throw new UnreachableCodeException();
     }
   }
 
-  private static record ValueEdge(
+  private record ValueEdge(
     SyValueNodeType source,
     SyValueNodeType target)
   {
diff --git a/pom.xml b/pom.xml
index ae32f3b5..74d1d0b0 100644
--- a/pom.xml
+++ b/pom.xml
@@ -9,7 +9,7 @@
   <parent>
     <groupId>com.io7m.primogenitor</groupId>
     <artifactId>com.io7m.primogenitor</artifactId>
-    <version>7.5.0</version>
+    <version>8.1.0</version>
   </parent>
 
   <groupId>com.io7m.jsycamore</groupId>
@@ -36,11 +36,11 @@
 
   <properties>
     <io7m.api.previousVersion>0.1.0</io7m.api.previousVersion>
-    <io7m.org.immutables.value.version>2.9.3</io7m.org.immutables.value.version>
-    <javafx.version>20.0.1</javafx.version>
-    <jqwik.version>1.7.3</jqwik.version>
-    <junit.version>5.9.3</junit.version>
-    <mockito.version>5.3.1</mockito.version>
+    <io7m.org.immutables.value.version>2.10.0</io7m.org.immutables.value.version>
+    <javafx.version>21.0.1</javafx.version>
+    <jqwik.version>1.8.1</jqwik.version>
+    <junit.version>5.10.0</junit.version>
+    <mockito.version>5.6.0</mockito.version>
   </properties>
 
   <licenses>
@@ -171,12 +171,12 @@
       <dependency>
         <groupId>org.slf4j</groupId>
         <artifactId>slf4j-api</artifactId>
-        <version>2.0.7</version>
+        <version>2.0.9</version>
       </dependency>
       <dependency>
         <groupId>ch.qos.logback</groupId>
         <artifactId>logback-classic</artifactId>
-        <version>1.4.7</version>
+        <version>1.4.11</version>
       </dependency>
       <dependency>
         <groupId>net.java.dev.designgridlayout</groupId>
@@ -191,7 +191,7 @@
       <dependency>
         <groupId>com.github.ben-manes.caffeine</groupId>
         <artifactId>caffeine</artifactId>
-        <version>3.1.6</version>
+        <version>3.1.8</version>
         <exclusions>
           <exclusion>
             <groupId>com.google.errorprone</groupId>