diff --git a/README.md b/README.md
index 5c9afe9..f41258c 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,7 @@ The plugin does the next steps:
         <plugin>
             <groupId>com.github.surpsg</groupId>
             <artifactId>diff-coverage-maven-plugin</artifactId>
-            <version>0.1.0</version>
+            <version>0.1.1</version>
             <configuration>
                 <!-- Required. diff content source. only one of file, URL or Git is allowed -->
                 <diffSource>
diff --git a/pom.xml b/pom.xml
index c96d022..997a35c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
     <artifactId>diff-coverage-maven-plugin</artifactId>
     <name>${project.groupId}:${project.artifactId}</name>
     <packaging>maven-plugin</packaging>
-    <version>0.1.0</version>
+    <version>0.1.1</version>
     <description>
         Diff coverage maven plugin builds code coverage report of new and modified code based on a provided diff
     </description>
@@ -55,10 +55,10 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <kotlin.version>1.3.72</kotlin.version>
+        <kotlin.version>1.4.32</kotlin.version>
         <kotlin.compiler.incremental>true</kotlin.compiler.incremental>
         <kotlin.code.style>official</kotlin.code.style>
-        <junit.version>4.12</junit.version>
+        <junit.version>4.13.1</junit.version>
         <maven.version>3.6.3</maven.version>
 
         <diff.source>HEAD</diff.source>
@@ -92,7 +92,7 @@
 
         <dependency>
             <groupId>org.jetbrains.kotlin</groupId>
-            <artifactId>kotlin-stdlib</artifactId>
+            <artifactId>kotlin-stdlib-jdk8</artifactId>
             <version>${kotlin.version}</version>
         </dependency>
         <dependency>
@@ -105,12 +105,12 @@
         <dependency>
             <groupId>com.github.form-com.diff-coverage-gradle</groupId>
             <artifactId>jacoco-filtering-extension</artifactId>
-            <version>0.7.0</version>
+            <version>0.7.2</version>
         </dependency>
         <dependency>
             <groupId>org.eclipse.jgit</groupId>
             <artifactId>org.eclipse.jgit</artifactId>
-            <version>5.7.0.202003110725-r</version>
+            <version>5.12.0.202106070339-r</version>
         </dependency>
 
         <dependency>
@@ -122,9 +122,8 @@
     </dependencies>
 
     <build>
-        <sourceDirectory>src/main/kotlin</sourceDirectory>
-        <testSourceDirectory>src/test/kotlin</testSourceDirectory>
-
+        <sourceDirectory>${project.basedir}/src/main/kotlin</sourceDirectory>
+        <testSourceDirectory>${project.basedir}/src/test/kotlin</testSourceDirectory>
         <plugins>
             <plugin>
                 <groupId>org.jetbrains.kotlin</groupId>
@@ -133,14 +132,12 @@
                 <executions>
                     <execution>
                         <id>compile</id>
-                        <phase>compile</phase>
                         <goals>
                             <goal>compile</goal>
                         </goals>
                     </execution>
                     <execution>
                         <id>test-compile</id>
-                        <phase>test-compile</phase>
                         <goals>
                             <goal>test-compile</goal>
                         </goals>
@@ -157,7 +154,7 @@
             <plugin>
                 <groupId>org.jacoco</groupId>
                 <artifactId>jacoco-maven-plugin</artifactId>
-                <version>0.8.5</version>
+                <version>0.8.7</version>
                 <executions>
                     <execution>
                         <id>pre-unit-test</id>
@@ -213,7 +210,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-invoker-plugin</artifactId>
-                <version>3.2.1</version>
+                <version>3.2.2</version>
                 <configuration>
                     <cloneProjectsTo>${project.build.directory}/it</cloneProjectsTo>
                     <postBuildHookScript>verify</postBuildHookScript>
@@ -238,7 +235,7 @@
             <plugin>
                 <groupId>com.github.surpsg</groupId>
                 <artifactId>diff-coverage-maven-plugin</artifactId>
-                <version>0.1.0</version>
+                <version>0.1.1</version>
                 <configuration>
                     <dataFile>${project.build.directory}/fullCoverage.exec</dataFile>
                     <diffSource>
diff --git a/settings.xml b/settings.xml
index 14e7e85..f061b54 100644
--- a/settings.xml
+++ b/settings.xml
@@ -2,13 +2,7 @@
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
                           https://maven.apache.org/xsd/settings-1.0.0.xsd">
-    <servers>
-        <server>
-            <id>ossrh</id>
-            <username>${env.USERNAME}</username>
-            <password>${env.PASS}</password>
-        </server>
-    </servers>
+
     <profiles>
         <profile>
             <id>ossrh</id>
diff --git a/src/it/git-diff-support/pom.xml b/src/it/git-diff-support/pom.xml
index dbfd0e4..bfa8e45 100644
--- a/src/it/git-diff-support/pom.xml
+++ b/src/it/git-diff-support/pom.xml
@@ -7,11 +7,16 @@
   <artifactId>it-check-passes</artifactId>
   <version>1.0-SNAPSHOT</version>
 
+  <properties>
+    <maven.compiler.source>1.8</maven.compiler.source>
+    <maven.compiler.target>1.8</maven.compiler.target>
+  </properties>
+
   <dependencies>
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.12</version>
+      <version>4.13.1</version>
       <scope>test</scope>
     </dependency>
   </dependencies>
@@ -21,7 +26,7 @@
       <plugin>
         <groupId>org.jacoco</groupId>
         <artifactId>jacoco-maven-plugin</artifactId>
-        <version>0.8.5</version>
+        <version>0.8.7</version>
         <executions>
           <execution>
             <goals>
@@ -33,7 +38,7 @@
       <plugin>
         <groupId>com.github.surpsg</groupId>
         <artifactId>diff-coverage-maven-plugin</artifactId>
-        <version>0.1.0</version>
+        <version>0.1.1</version>
         <configuration>
           <diffSource>
             <git>HEAD</git>
diff --git a/src/it/reports-generation-check/pom.xml b/src/it/reports-generation-check/pom.xml
index 6b894d4..a4ac6cb 100644
--- a/src/it/reports-generation-check/pom.xml
+++ b/src/it/reports-generation-check/pom.xml
@@ -7,11 +7,16 @@
   <artifactId>it-check-passes</artifactId>
   <version>1.0-SNAPSHOT</version>
 
+  <properties>
+    <maven.compiler.source>1.8</maven.compiler.source>
+    <maven.compiler.target>1.8</maven.compiler.target>
+  </properties>
+
   <dependencies>
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.12</version>
+      <version>4.13.1</version>
       <scope>test</scope>
     </dependency>
   </dependencies>
@@ -21,7 +26,7 @@
       <plugin>
         <groupId>org.jacoco</groupId>
         <artifactId>jacoco-maven-plugin</artifactId>
-        <version>0.8.5</version>
+        <version>0.8.7</version>
         <executions>
           <execution>
             <goals>
@@ -33,7 +38,7 @@
       <plugin>
         <groupId>com.github.surpsg</groupId>
         <artifactId>diff-coverage-maven-plugin</artifactId>
-        <version>0.1.0</version>
+        <version>0.1.1</version>
         <configuration>
           <diffSource>
             <file>diffFile.patch</file>
diff --git a/src/it/url-source-check/pom.xml b/src/it/url-source-check/pom.xml
index 073c573..4582a8f 100644
--- a/src/it/url-source-check/pom.xml
+++ b/src/it/url-source-check/pom.xml
@@ -7,11 +7,16 @@
   <artifactId>it-check-passes</artifactId>
   <version>1.0-SNAPSHOT</version>
 
+  <properties>
+    <maven.compiler.source>1.8</maven.compiler.source>
+    <maven.compiler.target>1.8</maven.compiler.target>
+  </properties>
+
   <dependencies>
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.12</version>
+      <version>4.13.1</version>
       <scope>test</scope>
     </dependency>
   </dependencies>
@@ -21,7 +26,7 @@
       <plugin>
         <groupId>org.jacoco</groupId>
         <artifactId>jacoco-maven-plugin</artifactId>
-        <version>0.8.5</version>
+        <version>0.8.7</version>
         <executions>
           <execution>
             <goals>
@@ -33,7 +38,7 @@
       <plugin>
         <groupId>com.github.surpsg</groupId>
         <artifactId>diff-coverage-maven-plugin</artifactId>
-        <version>0.1.0</version>
+        <version>0.1.1</version>
         <configuration>
           <diffSource>
             <url>${project.baseUri}diffFile.patch</url>
diff --git a/src/it/violation-rules-check/pom.xml b/src/it/violation-rules-check/pom.xml
index 239f060..84ff4ab 100644
--- a/src/it/violation-rules-check/pom.xml
+++ b/src/it/violation-rules-check/pom.xml
@@ -7,11 +7,16 @@
   <artifactId>it-check-passes</artifactId>
   <version>1.0-SNAPSHOT</version>
 
+  <properties>
+    <maven.compiler.source>1.8</maven.compiler.source>
+    <maven.compiler.target>1.8</maven.compiler.target>
+  </properties>
+
   <dependencies>
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.12</version>
+      <version>4.13.1</version>
       <scope>test</scope>
     </dependency>
   </dependencies>
@@ -21,7 +26,7 @@
       <plugin>
         <groupId>org.jacoco</groupId>
         <artifactId>jacoco-maven-plugin</artifactId>
-        <version>0.8.5</version>
+        <version>0.8.7</version>
         <executions>
           <execution>
             <goals>
@@ -33,7 +38,7 @@
       <plugin>
         <groupId>com.github.surpsg</groupId>
         <artifactId>diff-coverage-maven-plugin</artifactId>
-        <version>0.0.1</version>
+        <version>0.1.1</version>
         <configuration>
           <diffSource>
             <file>diffFile.patch</file>
diff --git a/src/main/kotlin/com/github/surpsg/DiffCoverageMojo.kt b/src/main/kotlin/com/github/surpsg/DiffCoverageMojo.kt
index b4ec6f9..1e13671 100644
--- a/src/main/kotlin/com/github/surpsg/DiffCoverageMojo.kt
+++ b/src/main/kotlin/com/github/surpsg/DiffCoverageMojo.kt
@@ -1,6 +1,9 @@
 package com.github.surpsg
 
-import com.form.coverage.*
+import com.form.coverage.DiffReport
+import com.form.coverage.Report
+import com.form.coverage.ReportType
+import com.form.coverage.Violation
 import com.form.coverage.report.ReportGenerator
 import com.form.coverage.report.analyzable.AnalyzableReport
 import com.form.coverage.report.analyzable.AnalyzableReportFactory
diff --git a/src/main/kotlin/com/github/surpsg/diffsource/JgitDiff.kt b/src/main/kotlin/com/github/surpsg/diffsource/JgitDiff.kt
index f44178b..dae8cb8 100644
--- a/src/main/kotlin/com/github/surpsg/diffsource/JgitDiff.kt
+++ b/src/main/kotlin/com/github/surpsg/diffsource/JgitDiff.kt
@@ -3,21 +3,16 @@ package com.github.surpsg.diffsource
 import org.eclipse.jgit.api.Git
 import org.eclipse.jgit.diff.DiffFormatter
 import org.eclipse.jgit.lib.ConfigConstants
-import org.eclipse.jgit.lib.CoreConfig
 import org.eclipse.jgit.lib.ObjectId
 import org.eclipse.jgit.lib.Repository
-import org.eclipse.jgit.revwalk.RevTree
 import org.eclipse.jgit.revwalk.RevWalk
 import org.eclipse.jgit.storage.file.FileRepositoryBuilder
 import org.eclipse.jgit.treewalk.AbstractTreeIterator
 import org.eclipse.jgit.treewalk.CanonicalTreeParser
 import org.eclipse.jgit.treewalk.FileTreeIterator
 import org.eclipse.jgit.treewalk.filter.TreeFilter
-import org.slf4j.LoggerFactory
 import java.io.ByteArrayOutputStream
 import java.io.File
-import java.lang.IllegalArgumentException
-import java.util.logging.Logger
 
 class JgitDiff(workingDir: File) {
 
@@ -31,8 +26,8 @@ class JgitDiff(workingDir: File) {
         }.build()
     } catch (e: IllegalArgumentException) {
         throw IllegalArgumentException(
-                "Git directory not found in the project root ${workingDir.absolutePath}",
-                e
+            "Git directory not found in the project root ${workingDir.absolutePath}",
+            e
         )
     }
 
@@ -43,8 +38,8 @@ class JgitDiff(workingDir: File) {
                 initialize()
 
                 scan(
-                        getTreeIterator(repository, commit),
-                        FileTreeIterator(repository)
+                    getTreeIterator(repository, commit),
+                    FileTreeIterator(repository)
                 ).forEach {
                     format(it)
                 }
@@ -59,16 +54,16 @@ class JgitDiff(workingDir: File) {
     private fun DiffFormatter.initialize() {
         setRepository(repository)
         repository.config.setEnum(
-                ConfigConstants.CONFIG_CORE_SECTION,
-                null,
-                ConfigConstants.CONFIG_KEY_AUTOCRLF,
-                getCrlf()
+            ConfigConstants.CONFIG_CORE_SECTION,
+            null,
+            ConfigConstants.CONFIG_KEY_AUTOCRLF,
+            getCrlf()
         )
         pathFilter = TreeFilter.ALL
     }
 
     private fun getTreeIterator(repo: Repository, name: String): AbstractTreeIterator {
-        val id: ObjectId = repo.resolve(name)
+        val id: ObjectId = repo.resolve(name) ?: throw IllegalArgumentException("No such commit $name")
         val parser = CanonicalTreeParser()
         repo.newObjectReader().use { objectReader ->
             RevWalk(repo).use { revWalk ->
diff --git a/src/test/kotlin/com/github/surpsg/diffsource/JgitDiffTest.kt b/src/test/kotlin/com/github/surpsg/diffsource/JgitDiffTest.kt
index 8f28229..37c6d27 100644
--- a/src/test/kotlin/com/github/surpsg/diffsource/JgitDiffTest.kt
+++ b/src/test/kotlin/com/github/surpsg/diffsource/JgitDiffTest.kt
@@ -10,8 +10,9 @@ class JgitDiffTest {
         JgitDiff(File("unknown/file/location"))
     }
 
-    @Test(expected = IllegalStateException::class)
+    @Test(expected = IllegalArgumentException::class)
     fun `jgit should throw when no such commit`() {
-        JgitDiff(File(".")).obtain("UNKNOWN_COMMIT")
+        val jgitDiff = JgitDiff(File("."))
+        jgitDiff.obtain("UNKNOWN_COMMIT")
     }
 }