diff --git a/build.gradle b/build.gradle
index 2384afd..3519cbc 100644
--- a/build.gradle
+++ b/build.gradle
@@ -24,7 +24,7 @@ plugins {
 
 java {
     toolchain {
-        languageVersion = JavaLanguageVersion.of(17)
+        languageVersion = JavaLanguageVersion.of(21)
     }
 }
 
@@ -99,7 +99,7 @@ dependencies {
     jmh 'org.openjdk.jmh:jmh-generator-annprocess:1.37'
 
     errorprone 'com.uber.nullaway:nullaway:0.12.10'
-    errorprone 'com.google.errorprone:error_prone_core:2.42.0'
+    errorprone 'com.google.errorprone:error_prone_core:2.43.0'
 
     // just tests
     testImplementation 'org.jetbrains.kotlin:kotlin-stdlib-jdk8'