diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index b1cd5ab72dee..3bb6a73e8b15 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -138,7 +138,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        java: ['17', '25', '26']
+        java: ['17', '25', '27']
     steps:
       - name: Set up JDK ${{ matrix.java }}
         uses: actions/setup-java@de7274f081f381c8f8158605e0321c36c376e2e6 # v6.0.1
@@ -254,7 +254,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        java: ['17', '25', '26']
+        java: ['17', '25', '27']
     steps:
       - name: Set up JDK ${{ matrix.java }}
         uses: actions/setup-java@de7274f081f381c8f8158605e0321c36c376e2e6 # v6.0.1
diff --git a/pom.xml b/pom.xml
index af7e868524d5..709abd7d6fb2 100644
--- a/pom.xml
+++ b/pom.xml
@@ -990,6 +990,22 @@ under the License.
   </build>
 
   <profiles>
+    <profile>
+      <!-- palantir-java-format crashes on JDK 27 (palantir/palantir-java-format#1786);
+           drop this profile once maven-parent ships a fixed release.
+           Activated by property, not <jdk>: the model builder tests build this POM in sessions
+           without java.version, where a <jdk> activation is an error. -->
+      <id>jdk27-skip-spotless</id>
+      <activation>
+        <property>
+          <name>java.specification.version</name>
+          <value>27</value>
+        </property>
+      </activation>
+      <properties>
+        <spotless.skip>true</spotless.skip>
+      </properties>
+    </profile>
     <profile>
       <id>mockito</id>
       <activation>