diff --git a/dependencies.md b/dependencies.md
index 27fbb46d48..a396f7fb29 100644
--- a/dependencies.md
+++ b/dependencies.md
@@ -1,6 +1,6 @@
 
 
-# Dependencies of `io.spine.tools:validation-context:2.0.0-SNAPSHOT.381`
+# Dependencies of `io.spine.tools:validation-context:2.0.0-SNAPSHOT.382`
 
 ## Runtime
 1.  **Group** : com.fasterxml.jackson. **Name** : jackson-bom. **Version** : 2.20.0.
@@ -1139,14 +1139,14 @@
 
 The dependencies distributed under several licenses, are used according their commercial-use-friendly license.
 
-This report was generated on **Fri Dec 19 15:26:30 WET 2025** using 
+This report was generated on **Fri Dec 19 18:17:36 WET 2025** using 
 [Gradle-License-Report plugin](https://github.com/jk1/Gradle-License-Report) by Evgeny Naumenko, licensed under 
 [Apache 2.0 License](https://github.com/jk1/Gradle-License-Report/blob/master/LICENSE).
 
 
 
 
-# Dependencies of `io.spine.tools:validation-context-tests:2.0.0-SNAPSHOT.381`
+# Dependencies of `io.spine.tools:validation-context-tests:2.0.0-SNAPSHOT.382`
 
 ## Runtime
 1.  **Group** : com.fasterxml.jackson. **Name** : jackson-bom. **Version** : 2.20.0.
@@ -2233,14 +2233,14 @@ This report was generated on **Fri Dec 19 15:26:30 WET 2025** using
 
 The dependencies distributed under several licenses, are used according their commercial-use-friendly license.
 
-This report was generated on **Fri Dec 19 15:26:30 WET 2025** using 
+This report was generated on **Fri Dec 19 18:17:36 WET 2025** using 
 [Gradle-License-Report plugin](https://github.com/jk1/Gradle-License-Report) by Evgeny Naumenko, licensed under 
 [Apache 2.0 License](https://github.com/jk1/Gradle-License-Report/blob/master/LICENSE).
 
 
 
 
-# Dependencies of `io.spine.tools:validation-gradle-plugin:2.0.0-SNAPSHOT.381`
+# Dependencies of `io.spine.tools:validation-gradle-plugin:2.0.0-SNAPSHOT.382`
 
 ## Runtime
 1.  **Group** : com.fasterxml.jackson. **Name** : jackson-bom. **Version** : 2.20.0.
@@ -3309,14 +3309,14 @@ This report was generated on **Fri Dec 19 15:26:30 WET 2025** using
 
 The dependencies distributed under several licenses, are used according their commercial-use-friendly license.
 
-This report was generated on **Fri Dec 19 15:26:30 WET 2025** using 
+This report was generated on **Fri Dec 19 18:17:36 WET 2025** using 
 [Gradle-License-Report plugin](https://github.com/jk1/Gradle-License-Report) by Evgeny Naumenko, licensed under 
 [Apache 2.0 License](https://github.com/jk1/Gradle-License-Report/blob/master/LICENSE).
 
 
 
 
-# Dependencies of `io.spine.tools:validation-java:2.0.0-SNAPSHOT.381`
+# Dependencies of `io.spine.tools:validation-java:2.0.0-SNAPSHOT.382`
 
 ## Runtime
 1.  **Group** : com.fasterxml.jackson. **Name** : jackson-bom. **Version** : 2.20.0.
@@ -4403,14 +4403,14 @@ This report was generated on **Fri Dec 19 15:26:30 WET 2025** using
 
 The dependencies distributed under several licenses, are used according their commercial-use-friendly license.
 
-This report was generated on **Fri Dec 19 15:26:30 WET 2025** using 
+This report was generated on **Fri Dec 19 18:17:36 WET 2025** using 
 [Gradle-License-Report plugin](https://github.com/jk1/Gradle-License-Report) by Evgeny Naumenko, licensed under 
 [Apache 2.0 License](https://github.com/jk1/Gradle-License-Report/blob/master/LICENSE).
 
 
 
 
-# Dependencies of `io.spine.tools:validation-java-bundle:2.0.0-SNAPSHOT.381`
+# Dependencies of `io.spine.tools:validation-java-bundle:2.0.0-SNAPSHOT.382`
 
 ## Runtime
 1.  **Group** : com.google.auto.service. **Name** : auto-service-annotations. **Version** : 1.1.1.
@@ -5188,14 +5188,14 @@ This report was generated on **Fri Dec 19 15:26:30 WET 2025** using
 
 The dependencies distributed under several licenses, are used according their commercial-use-friendly license.
 
-This report was generated on **Fri Dec 19 15:26:30 WET 2025** using 
+This report was generated on **Fri Dec 19 18:17:36 WET 2025** using 
 [Gradle-License-Report plugin](https://github.com/jk1/Gradle-License-Report) by Evgeny Naumenko, licensed under 
 [Apache 2.0 License](https://github.com/jk1/Gradle-License-Report/blob/master/LICENSE).
 
 
 
 
-# Dependencies of `io.spine:validation-jvm-runtime:2.0.0-SNAPSHOT.381`
+# Dependencies of `io.spine:validation-jvm-runtime:2.0.0-SNAPSHOT.382`
 
 ## Runtime
 1.  **Group** : com.google.code.findbugs. **Name** : jsr305. **Version** : 3.0.2.
@@ -6044,14 +6044,14 @@ This report was generated on **Fri Dec 19 15:26:30 WET 2025** using
 
 The dependencies distributed under several licenses, are used according their commercial-use-friendly license.
 
-This report was generated on **Fri Dec 19 15:26:30 WET 2025** using 
+This report was generated on **Fri Dec 19 18:17:36 WET 2025** using 
 [Gradle-License-Report plugin](https://github.com/jk1/Gradle-License-Report) by Evgeny Naumenko, licensed under 
 [Apache 2.0 License](https://github.com/jk1/Gradle-License-Report/blob/master/LICENSE).
 
 
 
 
-# Dependencies of `io.spine.tools:validation-ksp:2.0.0-SNAPSHOT.381`
+# Dependencies of `io.spine.tools:validation-ksp:2.0.0-SNAPSHOT.382`
 
 ## Runtime
 1.  **Group** : com.google.auto.service. **Name** : auto-service-annotations. **Version** : 1.1.1.
@@ -6996,14 +6996,14 @@ This report was generated on **Fri Dec 19 15:26:30 WET 2025** using
 
 The dependencies distributed under several licenses, are used according their commercial-use-friendly license.
 
-This report was generated on **Fri Dec 19 15:26:30 WET 2025** using 
+This report was generated on **Fri Dec 19 18:17:36 WET 2025** using 
 [Gradle-License-Report plugin](https://github.com/jk1/Gradle-License-Report) by Evgeny Naumenko, licensed under 
 [Apache 2.0 License](https://github.com/jk1/Gradle-License-Report/blob/master/LICENSE).
 
 
 
 
-# Dependencies of `io.spine.tools:validation-consumer:2.0.0-SNAPSHOT.381`
+# Dependencies of `io.spine.tools:validation-consumer:2.0.0-SNAPSHOT.382`
 
 ## Runtime
 1.  **Group** : com.fasterxml.jackson. **Name** : jackson-bom. **Version** : 2.20.0.
@@ -8090,14 +8090,14 @@ This report was generated on **Fri Dec 19 15:26:30 WET 2025** using
 
 The dependencies distributed under several licenses, are used according their commercial-use-friendly license.
 
-This report was generated on **Fri Dec 19 15:26:30 WET 2025** using 
+This report was generated on **Fri Dec 19 18:17:36 WET 2025** using 
 [Gradle-License-Report plugin](https://github.com/jk1/Gradle-License-Report) by Evgeny Naumenko, licensed under 
 [Apache 2.0 License](https://github.com/jk1/Gradle-License-Report/blob/master/LICENSE).
 
 
 
 
-# Dependencies of `io.spine.tools:validation-consumer-dependency:2.0.0-SNAPSHOT.381`
+# Dependencies of `io.spine.tools:validation-consumer-dependency:2.0.0-SNAPSHOT.382`
 
 ## Runtime
 1.  **Group** : com.google.code.findbugs. **Name** : jsr305. **Version** : 3.0.2.
@@ -9087,14 +9087,14 @@ This report was generated on **Fri Dec 19 15:26:30 WET 2025** using
 
 The dependencies distributed under several licenses, are used according their commercial-use-friendly license.
 
-This report was generated on **Fri Dec 19 15:26:30 WET 2025** using 
+This report was generated on **Fri Dec 19 18:17:36 WET 2025** using 
 [Gradle-License-Report plugin](https://github.com/jk1/Gradle-License-Report) by Evgeny Naumenko, licensed under 
 [Apache 2.0 License](https://github.com/jk1/Gradle-License-Report/blob/master/LICENSE).
 
 
 
 
-# Dependencies of `io.spine.tools:validation-extensions:2.0.0-SNAPSHOT.381`
+# Dependencies of `io.spine.tools:validation-extensions:2.0.0-SNAPSHOT.382`
 
 ## Runtime
 1.  **Group** : com.fasterxml.jackson. **Name** : jackson-bom. **Version** : 2.20.0.
@@ -10237,14 +10237,14 @@ This report was generated on **Fri Dec 19 15:26:30 WET 2025** using
 
 The dependencies distributed under several licenses, are used according their commercial-use-friendly license.
 
-This report was generated on **Fri Dec 19 15:26:30 WET 2025** using 
+This report was generated on **Fri Dec 19 18:17:36 WET 2025** using 
 [Gradle-License-Report plugin](https://github.com/jk1/Gradle-License-Report) by Evgeny Naumenko, licensed under 
 [Apache 2.0 License](https://github.com/jk1/Gradle-License-Report/blob/master/LICENSE).
 
 
 
 
-# Dependencies of `io.spine.tools:validation-runtime:2.0.0-SNAPSHOT.381`
+# Dependencies of `io.spine.tools:validation-runtime:2.0.0-SNAPSHOT.382`
 
 ## Runtime
 1.  **Group** : com.google.code.findbugs. **Name** : jsr305. **Version** : 3.0.2.
@@ -11234,14 +11234,14 @@ This report was generated on **Fri Dec 19 15:26:30 WET 2025** using
 
 The dependencies distributed under several licenses, are used according their commercial-use-friendly license.
 
-This report was generated on **Fri Dec 19 15:26:30 WET 2025** using 
+This report was generated on **Fri Dec 19 18:17:36 WET 2025** using 
 [Gradle-License-Report plugin](https://github.com/jk1/Gradle-License-Report) by Evgeny Naumenko, licensed under 
 [Apache 2.0 License](https://github.com/jk1/Gradle-License-Report/blob/master/LICENSE).
 
 
 
 
-# Dependencies of `io.spine.tools:validation-validating:2.0.0-SNAPSHOT.381`
+# Dependencies of `io.spine.tools:validation-validating:2.0.0-SNAPSHOT.382`
 
 ## Runtime
 1.  **Group** : com.google.code.findbugs. **Name** : jsr305. **Version** : 3.0.2.
@@ -12235,14 +12235,14 @@ This report was generated on **Fri Dec 19 15:26:30 WET 2025** using
 
 The dependencies distributed under several licenses, are used according their commercial-use-friendly license.
 
-This report was generated on **Fri Dec 19 15:26:30 WET 2025** using 
+This report was generated on **Fri Dec 19 18:17:36 WET 2025** using 
 [Gradle-License-Report plugin](https://github.com/jk1/Gradle-License-Report) by Evgeny Naumenko, licensed under 
 [Apache 2.0 License](https://github.com/jk1/Gradle-License-Report/blob/master/LICENSE).
 
 
 
 
-# Dependencies of `io.spine.tools:validation-validator:2.0.0-SNAPSHOT.381`
+# Dependencies of `io.spine.tools:validation-validator:2.0.0-SNAPSHOT.382`
 
 ## Runtime
 1.  **Group** : com.fasterxml.jackson. **Name** : jackson-bom. **Version** : 2.20.0.
@@ -13333,14 +13333,14 @@ This report was generated on **Fri Dec 19 15:26:30 WET 2025** using
 
 The dependencies distributed under several licenses, are used according their commercial-use-friendly license.
 
-This report was generated on **Fri Dec 19 15:26:30 WET 2025** using 
+This report was generated on **Fri Dec 19 18:17:36 WET 2025** using 
 [Gradle-License-Report plugin](https://github.com/jk1/Gradle-License-Report) by Evgeny Naumenko, licensed under 
 [Apache 2.0 License](https://github.com/jk1/Gradle-License-Report/blob/master/LICENSE).
 
 
 
 
-# Dependencies of `io.spine.tools:validation-validator-dependency:2.0.0-SNAPSHOT.381`
+# Dependencies of `io.spine.tools:validation-validator-dependency:2.0.0-SNAPSHOT.382`
 
 ## Runtime
 1.  **Group** : com.google.code.findbugs. **Name** : jsr305. **Version** : 3.0.2.
@@ -14165,14 +14165,14 @@ This report was generated on **Fri Dec 19 15:26:30 WET 2025** using
 
 The dependencies distributed under several licenses, are used according their commercial-use-friendly license.
 
-This report was generated on **Fri Dec 19 15:26:30 WET 2025** using 
+This report was generated on **Fri Dec 19 18:17:36 WET 2025** using 
 [Gradle-License-Report plugin](https://github.com/jk1/Gradle-License-Report) by Evgeny Naumenko, licensed under 
 [Apache 2.0 License](https://github.com/jk1/Gradle-License-Report/blob/master/LICENSE).
 
 
 
 
-# Dependencies of `io.spine.tools:validation-vanilla:2.0.0-SNAPSHOT.381`
+# Dependencies of `io.spine.tools:validation-vanilla:2.0.0-SNAPSHOT.382`
 
 ## Runtime
 1.  **Group** : com.google.code.findbugs. **Name** : jsr305. **Version** : 3.0.2.
@@ -15028,6 +15028,6 @@ This report was generated on **Fri Dec 19 15:26:30 WET 2025** using
 
 The dependencies distributed under several licenses, are used according their commercial-use-friendly license.
 
-This report was generated on **Fri Dec 19 15:26:30 WET 2025** using 
+This report was generated on **Fri Dec 19 18:17:36 WET 2025** using 
 [Gradle-License-Report plugin](https://github.com/jk1/Gradle-License-Report) by Evgeny Naumenko, licensed under 
 [Apache 2.0 License](https://github.com/jk1/Gradle-License-Report/blob/master/LICENSE).
\ No newline at end of file
diff --git a/jvm-runtime/src/main/proto/spine/validate/error_message.proto b/jvm-runtime/src/main/proto/spine/validation/error_message.proto
similarity index 99%
rename from jvm-runtime/src/main/proto/spine/validate/error_message.proto
rename to jvm-runtime/src/main/proto/spine/validation/error_message.proto
index 32e46a2ca1..9521073f8c 100644
--- a/jvm-runtime/src/main/proto/spine/validate/error_message.proto
+++ b/jvm-runtime/src/main/proto/spine/validation/error_message.proto
@@ -25,7 +25,7 @@
  */
 syntax = "proto3";
 
-package spine.validate;
+package spine.validation;
 
 import "spine/options.proto";
 
diff --git a/jvm-runtime/src/main/proto/spine/validate/validation_error.proto b/jvm-runtime/src/main/proto/spine/validation/validation_error.proto
similarity index 97%
rename from jvm-runtime/src/main/proto/spine/validate/validation_error.proto
rename to jvm-runtime/src/main/proto/spine/validation/validation_error.proto
index c39c7ea55b..093d38e0a5 100644
--- a/jvm-runtime/src/main/proto/spine/validate/validation_error.proto
+++ b/jvm-runtime/src/main/proto/spine/validation/validation_error.proto
@@ -25,7 +25,7 @@
  */
 syntax = "proto3";
 
-package spine.validate;
+package spine.validation;
 
 import "spine/options.proto";
 
@@ -36,7 +36,7 @@ option java_package = "io.spine.validation";
 
 import "google/protobuf/any.proto";
 
-import "spine/validate/error_message.proto";
+import "spine/validation/error_message.proto";
 import "spine/base/field_path.proto";
 
 // An error indicating that a message did not pass validation.
@@ -62,7 +62,7 @@ message ConstraintViolation {
     // 1. In Kotlin, use the `TemplateString.format()` extension.
     // 2. In Java, use the `io.spine.validate.TemplateStrings.format()` static method.
     //
-    spine.validate.TemplateString message = 8;
+    TemplateString message = 8;
 
     // The name of the validated message type.
     //
diff --git a/pom.xml b/pom.xml
index d0c646537e..4ae0a2a975 100644
--- a/pom.xml
+++ b/pom.xml
@@ -10,7 +10,7 @@ all modules and does not describe the project structure per-subproject.
  -->
 <groupId>io.spine.tools</groupId>
 <artifactId>validation</artifactId>
-<version>2.0.0-SNAPSHOT.381</version>
+<version>2.0.0-SNAPSHOT.382</version>
 
 <inceptionYear>2015</inceptionYear>
 
diff --git a/version.gradle.kts b/version.gradle.kts
index 74820b3683..f8fd1f8046 100644
--- a/version.gradle.kts
+++ b/version.gradle.kts
@@ -29,4 +29,4 @@
  *
  * For Spine-based dependencies please see [io.spine.dependency.local.Spine].
  */
-val validationVersion by extra("2.0.0-SNAPSHOT.381")
+val validationVersion by extra("2.0.0-SNAPSHOT.382")