diff --git a/build.gradle b/build.gradle
index d33bdde76..7ae267455 100644
--- a/build.gradle
+++ b/build.gradle
@@ -7,13 +7,13 @@ buildscript {
     dependencies {
         classpath 'com.palantir.jakartapackagealignment:jakarta-package-alignment:0.6.0'
         classpath 'com.gradle.publish:plugin-publish-plugin:2.1.1'
-        classpath 'com.palantir.baseline-error-prone:gradle-baseline-error-prone:0.7.0'
+        classpath 'com.palantir.baseline-error-prone:gradle-baseline-error-prone:0.17.0'
         classpath 'com.palantir.baseline:gradle-baseline-java:6.80.0'
         classpath 'com.palantir.gradle.consistentversions:gradle-consistent-versions:3.16.0'
         classpath 'com.palantir.gradle.externalpublish:gradle-external-publish-plugin:1.35.0'
         classpath 'com.palantir.gradle.failure-reports:gradle-failure-reports:1.18.0'
         classpath 'com.palantir.gradle.gitversion:gradle-git-version:5.0.0'
-        classpath 'com.palantir.gradle.guide:gradle-guide:1.27.0'
+        classpath 'com.palantir.gradle.guide:gradle-guide:1.28.0'
         classpath 'com.palantir.gradle.idea-configuration:gradle-idea-configuration:0.10.0'
         classpath 'com.palantir.gradle.idea-language-injector:gradle-idea-language-injector:0.3.0'
         classpath 'com.palantir.gradle.jdks:gradle-jdks:0.79.0'
diff --git a/gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/FileUtils.java b/gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/FileUtils.groovy
similarity index 100%
rename from gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/FileUtils.java
rename to gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/FileUtils.groovy
diff --git a/gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/NativeImageAtomicCopy.java b/gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/NativeImageAtomicCopy.groovy
similarity index 100%
rename from gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/NativeImageAtomicCopy.java
rename to gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/NativeImageAtomicCopy.groovy
diff --git a/gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/PalantirJavaFormatIdeaPlugin.java b/gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/PalantirJavaFormatIdeaPlugin.groovy
similarity index 100%
rename from gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/PalantirJavaFormatIdeaPlugin.java
rename to gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/PalantirJavaFormatIdeaPlugin.groovy
diff --git a/gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/PalantirJavaFormatPlugin.java b/gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/PalantirJavaFormatPlugin.groovy
similarity index 100%
rename from gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/PalantirJavaFormatPlugin.java
rename to gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/PalantirJavaFormatPlugin.groovy
diff --git a/gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/UpdatePalantirJavaFormatIdeaXmlFile.java b/gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/UpdatePalantirJavaFormatIdeaXmlFile.groovy
similarity index 100%
rename from gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/UpdatePalantirJavaFormatIdeaXmlFile.java
rename to gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/UpdatePalantirJavaFormatIdeaXmlFile.groovy
diff --git a/gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/UpdateWorkspaceXmlFile.java b/gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/UpdateWorkspaceXmlFile.groovy
similarity index 100%
rename from gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/UpdateWorkspaceXmlFile.java
rename to gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/UpdateWorkspaceXmlFile.groovy
diff --git a/gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/XmlUtils.java b/gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/XmlUtils.groovy
similarity index 100%
rename from gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/XmlUtils.java
rename to gradle-palantir-java-format/src/main/groovy/com/palantir/javaformat/gradle/XmlUtils.groovy