diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6c78bee2..0dd9616a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,7 +10,7 @@ jobs:
     strategy:
       matrix:
         os: [ ubuntu-latest, windows-latest, macos-latest ]
-        java: [ 8, 11, 14 ]
+        java: [ 8, 11, 16 ]
     runs-on: ${{ matrix.os }}
     timeout-minutes: 20
     steps:
diff --git a/build.gradle.kts b/build.gradle.kts
index f7885e7e..442273e3 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -6,8 +6,7 @@ import java.util.*
 val kotlinVersion = plugins.getPlugin(KotlinPluginWrapper::class.java).kotlinPluginVersion
 
 plugins {
-//  kotlin("jvm") version "1.4.31"
-  kotlin("jvm") version "1.3.72"
+  kotlin("jvm") version "1.4.31"
   id("maven-publish")
   id("signing")
   id("com.github.ben-manes.versions") version "0.39.0"
@@ -80,8 +79,13 @@ val dependencyVersions = listOf<String>(
 
 val dependencyGroupVersions = mapOf<String, String>()
 
+dependencyLocking {
+  lockMode.set(LockMode.STRICT)
+}
+
 configurations.all {
   resolutionStrategy {
+    activateDependencyLocking()
     failOnVersionConflict()
     force(dependencyVersions)
     eachDependency {
diff --git a/gradle.lockfile b/gradle.lockfile
new file mode 100644
index 00000000..7d9b3b8c
--- /dev/null
+++ b/gradle.lockfile
@@ -0,0 +1,46 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.
+ch.qos.logback:logback-classic:1.2.3=testRuntimeClasspath,testRuntimeOnlyDependenciesMetadata
+ch.qos.logback:logback-core:1.2.3=testRuntimeClasspath,testRuntimeOnlyDependenciesMetadata
+com.beust:klaxon:5.5=testCompileClasspath,testImplementationDependenciesMetadata,testRuntimeClasspath
+com.google.re2j:re2j:1.6=compileClasspath,implementationDependenciesMetadata,runtimeClasspath,testCompileClasspath,testImplementationDependenciesMetadata,testRuntimeClasspath
+com.squareup.moshi:moshi-kotlin:1.12.0=compileClasspath,implementationDependenciesMetadata,runtimeClasspath,testCompileClasspath,testImplementationDependenciesMetadata,testRuntimeClasspath
+com.squareup.moshi:moshi:1.12.0=compileClasspath,implementationDependenciesMetadata,runtimeClasspath,testCompileClasspath,testImplementationDependenciesMetadata,testRuntimeClasspath
+com.squareup.okio:okio-metadata:2.10.0=implementationDependenciesMetadata,testImplementationDependenciesMetadata
+com.squareup.okio:okio:2.10.0=compileClasspath,implementationDependenciesMetadata,runtimeClasspath,testCompileClasspath,testImplementationDependenciesMetadata,testRuntimeClasspath
+io.github.classgraph:classgraph:4.8.37=testRuntimeClasspath
+io.github.microutils:kotlin-logging-jvm:2.0.8=compileClasspath,runtimeClasspath,testCompileClasspath,testRuntimeClasspath
+io.github.microutils:kotlin-logging:2.0.8=compileClasspath,implementationDependenciesMetadata,runtimeClasspath,testCompileClasspath,testImplementationDependenciesMetadata,testRuntimeClasspath
+org.apiguardian:apiguardian-api:1.1.0=testRuntimeClasspath,testRuntimeOnlyDependenciesMetadata
+org.jetbrains.intellij.deps:trove4j:1.0.20181211=kotlinCompilerClasspath
+org.jetbrains.kotlin:kotlin-compiler-embeddable:1.4.31=kotlinCompilerClasspath
+org.jetbrains.kotlin:kotlin-daemon-embeddable:1.4.31=kotlinCompilerClasspath
+org.jetbrains.kotlin:kotlin-reflect:1.4.31=compileClasspath,implementationDependenciesMetadata,kotlinCompilerClasspath,runtimeClasspath,testCompileClasspath,testImplementationDependenciesMetadata,testRuntimeClasspath
+org.jetbrains.kotlin:kotlin-script-runtime:1.4.31=kotlinCompilerClasspath,kotlinCompilerPluginClasspath
+org.jetbrains.kotlin:kotlin-scripting-common:1.4.31=kotlinCompilerPluginClasspath
+org.jetbrains.kotlin:kotlin-scripting-compiler-embeddable:1.4.31=kotlinCompilerPluginClasspath
+org.jetbrains.kotlin:kotlin-scripting-compiler-impl-embeddable:1.4.31=kotlinCompilerPluginClasspath
+org.jetbrains.kotlin:kotlin-scripting-jvm:1.4.31=kotlinCompilerPluginClasspath
+org.jetbrains.kotlin:kotlin-stdlib-common:1.4.31=compileClasspath,implementationDependenciesMetadata,kotlinCompilerClasspath,kotlinCompilerPluginClasspath,runtimeClasspath,testCompileClasspath,testImplementationDependenciesMetadata,testRuntimeClasspath
+org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.4.31=testRuntimeClasspath
+org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.4.31=testRuntimeClasspath
+org.jetbrains.kotlin:kotlin-stdlib:1.4.31=compileClasspath,implementationDependenciesMetadata,kotlinCompilerClasspath,kotlinCompilerPluginClasspath,runtimeClasspath,testCompileClasspath,testImplementationDependenciesMetadata,testRuntimeClasspath
+org.jetbrains.kotlin:kotlin-test-common:1.4.31=testCompileClasspath,testImplementationDependenciesMetadata,testRuntimeClasspath
+org.jetbrains.kotlin:kotlin-test:1.4.31=testCompileClasspath,testImplementationDependenciesMetadata,testRuntimeClasspath
+org.jetbrains.kotlinx:kotlinx-coroutines-core-common:1.3.3=testRuntimeClasspath
+org.jetbrains.kotlinx:kotlinx-coroutines-core:1.2.1=kotlinCompilerPluginClasspath
+org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.3=testRuntimeClasspath
+org.jetbrains:annotations:13.0=compileClasspath,implementationDependenciesMetadata,kotlinCompilerClasspath,kotlinCompilerPluginClasspath,runtimeClasspath,testCompileClasspath,testImplementationDependenciesMetadata,testRuntimeClasspath
+org.junit.platform:junit-platform-commons:1.7.2=testRuntimeClasspath,testRuntimeOnlyDependenciesMetadata
+org.junit.platform:junit-platform-engine:1.7.2=testRuntimeClasspath,testRuntimeOnlyDependenciesMetadata
+org.junit.platform:junit-platform-launcher:1.7.2=testRuntimeClasspath,testRuntimeOnlyDependenciesMetadata
+org.junit:junit-bom:5.7.2=testRuntimeClasspath,testRuntimeOnlyDependenciesMetadata
+org.opentest4j:opentest4j:1.2.0=testRuntimeClasspath,testRuntimeOnlyDependenciesMetadata
+org.slf4j:slf4j-api:1.7.25=testRuntimeOnlyDependenciesMetadata
+org.slf4j:slf4j-api:1.7.30=compileClasspath,implementationDependenciesMetadata,runtimeClasspath,testCompileClasspath,testImplementationDependenciesMetadata,testRuntimeClasspath
+org.spekframework.spek2:spek-dsl-jvm:2.0.15=testCompileClasspath,testImplementationDependenciesMetadata,testRuntimeClasspath
+org.spekframework.spek2:spek-runner-junit5:2.0.15=testRuntimeClasspath,testRuntimeOnlyDependenciesMetadata
+org.spekframework.spek2:spek-runtime-jvm:2.0.15=testRuntimeClasspath
+org.yaml:snakeyaml:1.28=compileClasspath,implementationDependenciesMetadata,runtimeClasspath,testCompileClasspath,testImplementationDependenciesMetadata,testRuntimeClasspath
+empty=annotationProcessor,apiDependenciesMetadata,compile,compileOnly,compileOnlyDependenciesMetadata,kotlinNativeCompilerPluginClasspath,kotlinScriptDef,kotlinScriptDefExtensions,runtime,runtimeOnlyDependenciesMetadata,signatures,testAnnotationProcessor,testApiDependenciesMetadata,testCompile,testCompileOnly,testCompileOnlyDependenciesMetadata,testKotlinScriptDef,testKotlinScriptDefExtensions,testRuntime