diff --git a/src/main/java/org/openrewrite/maven/AbstractRewriteBaseRunMojo.java b/src/main/java/org/openrewrite/maven/AbstractRewriteBaseRunMojo.java
index 35030088..2ea3891d 100644
--- a/src/main/java/org/openrewrite/maven/AbstractRewriteBaseRunMojo.java
+++ b/src/main/java/org/openrewrite/maven/AbstractRewriteBaseRunMojo.java
@@ -20,6 +20,7 @@
 import org.apache.maven.plugin.MojoExecutionException;
 import org.apache.maven.plugins.annotations.Parameter;
 import org.codehaus.plexus.classworlds.realm.ClassRealm;
+import org.jspecify.annotations.Nullable;
 import org.openrewrite.*;
 import org.openrewrite.config.CompositeRecipe;
 import org.openrewrite.config.DeclarativeRecipe;
@@ -27,7 +28,6 @@
 import org.openrewrite.config.RecipeDescriptor;
 import org.openrewrite.internal.InMemoryLargeSourceSet;
 import org.openrewrite.internal.ListUtils;
-import org.openrewrite.internal.lang.Nullable;
 import org.openrewrite.java.tree.J;
 import org.openrewrite.kotlin.tree.K;
 import org.openrewrite.marker.*;
diff --git a/src/main/java/org/openrewrite/maven/AbstractRewriteDryRunMojo.java b/src/main/java/org/openrewrite/maven/AbstractRewriteDryRunMojo.java
index 28896258..4393fa80 100644
--- a/src/main/java/org/openrewrite/maven/AbstractRewriteDryRunMojo.java
+++ b/src/main/java/org/openrewrite/maven/AbstractRewriteDryRunMojo.java
@@ -17,9 +17,9 @@
 
 import org.apache.maven.plugin.MojoExecutionException;
 import org.apache.maven.plugins.annotations.Parameter;
+import org.jspecify.annotations.Nullable;
 import org.openrewrite.ExecutionContext;
 import org.openrewrite.Result;
-import org.openrewrite.internal.lang.Nullable;
 
 import java.io.BufferedWriter;
 import java.io.IOException;
diff --git a/src/main/java/org/openrewrite/maven/AbstractRewriteMojo.java b/src/main/java/org/openrewrite/maven/AbstractRewriteMojo.java
index 5be6a20e..e422f5e4 100644
--- a/src/main/java/org/openrewrite/maven/AbstractRewriteMojo.java
+++ b/src/main/java/org/openrewrite/maven/AbstractRewriteMojo.java
@@ -23,11 +23,11 @@
 import org.apache.maven.settings.crypto.SettingsDecrypter;
 import org.eclipse.aether.RepositorySystem;
 import org.eclipse.aether.artifact.Artifact;
+import org.jspecify.annotations.Nullable;
 import org.openrewrite.*;
 import org.openrewrite.config.ClasspathScanningLoader;
 import org.openrewrite.config.Environment;
 import org.openrewrite.config.YamlResourceLoader;
-import org.openrewrite.internal.lang.Nullable;
 import org.openrewrite.ipc.http.HttpSender;
 import org.openrewrite.ipc.http.HttpUrlConnectionSender;
 
diff --git a/src/main/java/org/openrewrite/maven/AbstractRewriteRunMojo.java b/src/main/java/org/openrewrite/maven/AbstractRewriteRunMojo.java
index 016335e9..8cbbadb2 100644
--- a/src/main/java/org/openrewrite/maven/AbstractRewriteRunMojo.java
+++ b/src/main/java/org/openrewrite/maven/AbstractRewriteRunMojo.java
@@ -16,12 +16,12 @@
 package org.openrewrite.maven;
 
 import org.apache.maven.plugin.MojoExecutionException;
+import org.jspecify.annotations.Nullable;
 import org.openrewrite.ExecutionContext;
 import org.openrewrite.FileAttributes;
 import org.openrewrite.PrintOutputCapture;
 import org.openrewrite.Result;
 import org.openrewrite.binary.Binary;
-import org.openrewrite.internal.lang.Nullable;
 import org.openrewrite.quark.Quark;
 import org.openrewrite.remote.Remote;
 
diff --git a/src/main/java/org/openrewrite/maven/ConfigurableRewriteMojo.java b/src/main/java/org/openrewrite/maven/ConfigurableRewriteMojo.java
index 0841eadc..3abaf5a3 100644
--- a/src/main/java/org/openrewrite/maven/ConfigurableRewriteMojo.java
+++ b/src/main/java/org/openrewrite/maven/ConfigurableRewriteMojo.java
@@ -25,8 +25,8 @@
 import org.codehaus.plexus.util.xml.Xpp3Dom;
 import org.codehaus.plexus.util.xml.pull.MXSerializer;
 import org.intellij.lang.annotations.Language;
+import org.jspecify.annotations.Nullable;
 import org.openrewrite.config.Environment;
-import org.openrewrite.internal.lang.Nullable;
 import org.openrewrite.style.NamedStyles;
 
 import java.io.IOException;
diff --git a/src/main/java/org/openrewrite/maven/MavenLoggingMeterRegistry.java b/src/main/java/org/openrewrite/maven/MavenLoggingMeterRegistry.java
index c1c0e32e..1b2ae748 100644
--- a/src/main/java/org/openrewrite/maven/MavenLoggingMeterRegistry.java
+++ b/src/main/java/org/openrewrite/maven/MavenLoggingMeterRegistry.java
@@ -25,9 +25,9 @@
 import io.micrometer.core.instrument.internal.DefaultLongTaskTimer;
 import io.micrometer.core.instrument.internal.DefaultMeter;
 import io.micrometer.core.instrument.util.TimeUtils;
-import org.apache.maven.plugin.logging.Log;
-import org.openrewrite.internal.lang.NonNullApi;
-import org.openrewrite.internal.lang.Nullable;
+import org.apache.maven.plugin.logging.Log;
+import org.jspecify.annotations.NullMarked;
+import org.jspecify.annotations.Nullable;
 
 import java.time.Duration;
 import java.util.concurrent.TimeUnit;
@@ -38,7 +38,7 @@
 import static io.micrometer.core.instrument.util.DoubleFormat.decimalOrNan;
 import static java.util.stream.Collectors.joining;
 
-@NonNullApi
+@NullMarked
 public class MavenLoggingMeterRegistry extends MeterRegistry {
     private final Log log;
 
diff --git a/src/main/java/org/openrewrite/maven/MavenLoggingResolutionEventListener.java b/src/main/java/org/openrewrite/maven/MavenLoggingResolutionEventListener.java
index 0305a476..e883e865 100644
--- a/src/main/java/org/openrewrite/maven/MavenLoggingResolutionEventListener.java
+++ b/src/main/java/org/openrewrite/maven/MavenLoggingResolutionEventListener.java
@@ -16,7 +16,7 @@
 package org.openrewrite.maven;
 
 import org.apache.maven.plugin.logging.Log;
-import org.openrewrite.internal.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.openrewrite.maven.tree.*;
 
 import java.util.List;
diff --git a/src/main/java/org/openrewrite/maven/MavenMojoProjectParser.java b/src/main/java/org/openrewrite/maven/MavenMojoProjectParser.java
index bc3309fa..a6369b4f 100644
--- a/src/main/java/org/openrewrite/maven/MavenMojoProjectParser.java
+++ b/src/main/java/org/openrewrite/maven/MavenMojoProjectParser.java
@@ -30,11 +30,11 @@
 import org.apache.maven.settings.crypto.SettingsDecryptionRequest;
 import org.apache.maven.settings.crypto.SettingsDecryptionResult;
 import org.codehaus.plexus.util.xml.Xpp3Dom;
+import org.jspecify.annotations.Nullable;
 import org.openrewrite.ExecutionContext;
 import org.openrewrite.ParseExceptionResult;
 import org.openrewrite.SourceFile;
 import org.openrewrite.internal.StringUtils;
-import org.openrewrite.internal.lang.Nullable;
 import org.openrewrite.java.JavaParser;
 import org.openrewrite.java.internal.JavaTypeCache;
 import org.openrewrite.java.marker.JavaProject;
@@ -155,7 +155,7 @@ public Stream<SourceFile> listSourceFiles(MavenProject mavenProject, List<NamedS
         }
     }
 
-    public Stream<SourceFile> listSourceFiles(MavenProject mavenProject, @Nullable Xml.Document maven, List<Marker> projectProvenance, List<NamedStyles> styles,
+    public Stream<SourceFile> listSourceFiles(MavenProject mavenProject, Xml.@Nullable Document maven, List<Marker> projectProvenance, List<NamedStyles> styles,
                                               ExecutionContext ctx) throws DependencyResolutionRequiredException, MojoExecutionException {
         Stream<SourceFile> sourceFiles = Stream.empty();
         Set<Path> alreadyParsed = new HashSet<>();
@@ -514,7 +514,7 @@ private static JavaSourceSet sourceSet(String name, List<Path> dependencies, Jav
         return JavaSourceSet.build(name, dependencies);
     }
 
-    public @Nullable Xml.Document parseMaven(MavenProject mavenProject, List<Marker> projectProvenance, ExecutionContext ctx) {
+    public Xml.@Nullable Document parseMaven(MavenProject mavenProject, List<Marker> projectProvenance, ExecutionContext ctx) {
         return parseMaven(singletonList(mavenProject), singletonMap(mavenProject, projectProvenance), ctx).get(mavenProject);
     }
 
diff --git a/src/main/java/org/openrewrite/maven/MavenPomCacheBuilder.java b/src/main/java/org/openrewrite/maven/MavenPomCacheBuilder.java
index 4c1464aa..c05691a5 100644
--- a/src/main/java/org/openrewrite/maven/MavenPomCacheBuilder.java
+++ b/src/main/java/org/openrewrite/maven/MavenPomCacheBuilder.java
@@ -16,7 +16,7 @@
 package org.openrewrite.maven;
 
 import org.apache.maven.plugin.logging.Log;
-import org.openrewrite.internal.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.openrewrite.maven.cache.CompositeMavenPomCache;
 import org.openrewrite.maven.cache.InMemoryMavenPomCache;
 import org.openrewrite.maven.cache.MavenPomCache;
diff --git a/src/main/java/org/openrewrite/maven/MeterRegistryProvider.java b/src/main/java/org/openrewrite/maven/MeterRegistryProvider.java
index e197e54e..8ac4d51c 100644
--- a/src/main/java/org/openrewrite/maven/MeterRegistryProvider.java
+++ b/src/main/java/org/openrewrite/maven/MeterRegistryProvider.java
@@ -25,16 +25,16 @@
 import io.rsocket.transport.ClientTransport;
 import io.rsocket.transport.netty.client.TcpClientTransport;
 import io.rsocket.transport.netty.client.WebsocketClientTransport;
-import org.apache.maven.plugin.logging.Log;
-import org.openrewrite.internal.lang.Nullable;
+import org.apache.maven.plugin.logging.Log;
+import org.jspecify.annotations.Nullable;
 import reactor.netty.http.client.HttpClient;
 import reactor.netty.tcp.TcpClient;
 import reactor.util.retry.Retry;
 
 import java.net.URI;
 import java.time.Duration;
-import java.util.Base64;
-
+import java.util.Base64;
+
 public class MeterRegistryProvider implements AutoCloseable {
     private final Log log;
 
diff --git a/src/main/java/org/openrewrite/maven/RewriteDiscoverMojo.java b/src/main/java/org/openrewrite/maven/RewriteDiscoverMojo.java
index 31800281..787e53b5 100644
--- a/src/main/java/org/openrewrite/maven/RewriteDiscoverMojo.java
+++ b/src/main/java/org/openrewrite/maven/RewriteDiscoverMojo.java
@@ -18,11 +18,11 @@
 import org.apache.maven.plugin.MojoExecutionException;
 import org.apache.maven.plugins.annotations.Mojo;
 import org.apache.maven.plugins.annotations.Parameter;
+import org.jspecify.annotations.Nullable;
 import org.openrewrite.config.Environment;
 import org.openrewrite.config.OptionDescriptor;
 import org.openrewrite.config.RecipeDescriptor;
 import org.openrewrite.internal.StringUtils;
-import org.openrewrite.internal.lang.Nullable;
 import org.openrewrite.style.NamedStyles;
 
 import java.util.*;