diff --git a/.baseline/checkstyle/checkstyle.xml b/.baseline/checkstyle/checkstyle.xml
index 476882c2..40af80ae 100644
--- a/.baseline/checkstyle/checkstyle.xml
+++ b/.baseline/checkstyle/checkstyle.xml
@@ -18,10 +18,6 @@
     <module name="NewlineAtEndOfFile"> <!-- Java Style Guide: Line ending: LF -->
         <property name="lineSeparator" value="lf"/>
     </module>
-    <module name="RegexpHeader">
-        <property name="header" value="^/\*$\n^ \* \(c\) Copyright \d{4} Palantir Technologies Inc\. All rights reserved\.$"/>
-        <property name="fileExtensions" value=".java,.ts"/>
-    </module>
     <module name="RegexpMultiline"> <!-- Development Practices: Writing good unit tests -->
         <property name="fileExtensions" value="java"/>
         <property name="format" value="@VisibleForTesting\s+(protected|public)"/>
diff --git a/build.gradle b/build.gradle
index cf335c95..3bf8cb10 100644
--- a/build.gradle
+++ b/build.gradle
@@ -11,7 +11,7 @@ buildscript {
         classpath 'com.palantir.gradle.consistentversions:gradle-consistent-versions:1.17.2'
         classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.8.4'
         classpath 'com.netflix.nebula:nebula-publishing-plugin:17.0.5'
-        classpath 'com.palantir.baseline:gradle-baseline-java:3.3.0'
+        classpath 'com.palantir.baseline:gradle-baseline-java:3.4.2'
     }
 }
 
diff --git a/preconditions/src/main/java/com/palantir/logsafe/Preconditions.java b/preconditions/src/main/java/com/palantir/logsafe/Preconditions.java
index 1f3c2c3b..0c6dd290 100755
--- a/preconditions/src/main/java/com/palantir/logsafe/Preconditions.java
+++ b/preconditions/src/main/java/com/palantir/logsafe/Preconditions.java
@@ -1,6 +1,17 @@
 /*
  * (c) Copyright 2018 Palantir Technologies Inc. All rights reserved.
- * Adapted from Guava 21.0 under the Apache 2 license; original copyright below.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
 
 /*