diff --git a/build.gradle.kts b/build.gradle.kts
index b563c7f..c34297f 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -42,7 +42,7 @@ plugins {
     java
     kotlin("jvm")
     id("com.google.protobuf")
-    id("com.osacky.doctor") version "0.8.1"
+    id("com.osacky.doctor") version "0.12.0"
 }
 
 kotlin {
diff --git a/buildSrc/build.gradle.kts b/buildSrc/build.gradle.kts
index d7b3bfd..147f5c2 100644
--- a/buildSrc/build.gradle.kts
+++ b/buildSrc/build.gradle.kts
@@ -75,7 +75,7 @@ val grGitVersion = "4.1.1"
  * This version may change from the [version of Kotlin][io.spine.dependency.lib.Kotlin.version]
  * used by the project.
  */
-val kotlinVersion = "2.1.21"
+val kotlinVersion = "2.2.20"
 
 /**
  * The version of Guava used in `buildSrc`.
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index ff23a68..2e11132 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.14.2-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.1.0-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
diff --git a/journal.log b/journal.log
index 46d5ed4..d0764a4 100644
--- a/journal.log
+++ b/journal.log
@@ -7,6 +7,8 @@
 #
 # Please do not edit this file by hand.
 #
+1:59 :: sanders :: 2025-10-24T17:03:42.782253Z :: Compiler:2.0.0-SNAPSHOT.028;CoreJvmCompiler:2.0.0-SNAPSHOT.020;CoreJvm:2.0.0-SNAPSHOT.332;Validation:2.0.0-SNAPSHOT.352
+2:59 :: sanders :: 2025-10-24T16:59:51.958550Z :: Compiler:2.0.0-SNAPSHOT.028;CoreJvmCompiler:2.0.0-SNAPSHOT.020;CoreJvm:2.0.0-SNAPSHOT.332;Validation:2.0.0-SNAPSHOT.352
 2:20 :: sanders :: 2025-10-08T18:17:12.931254Z :: Compiler:2.0.0-SNAPSHOT.024;CoreJvmCompiler:2.0.0-SNAPSHOT.015;CoreJvm:2.0.0-SNAPSHOT.330;Validation:2.0.0-SNAPSHOT.351
 2:1 :: sanders :: 2025-10-08T17:22:02.372621Z :: Compiler:2.0.0-SNAPSHOT.024;CoreJvmCompiler:2.0.0-SNAPSHOT.015;CoreJvm:2.0.0-SNAPSHOT.330;Validation:2.0.0-SNAPSHOT.351
 2:42 :: sanders :: 2025-09-29T15:14:01.038331Z :: Compiler:2.0.0-SNAPSHOT.016;CoreJvmCompiler:2.0.0-SNAPSHOT.008;CoreJvm:2.0.0-SNAPSHOT.330;Validation:2.0.0-SNAPSHOT.351