diff --git a/CHANGELOG.md b/CHANGELOG.md
index 80572d3..0c1aeeb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+# 3.3.2
+* Fix boolean parsing in plain class (#65)
+
 # 3.3.1
 * Revert breaking change to argument name resolution. 
   The naming strategy can be changed in `configureArkenv`.  
diff --git a/arkenv/build.gradle.kts b/arkenv/build.gradle.kts
index f4bd1c6..6e3f4fa 100644
--- a/arkenv/build.gradle.kts
+++ b/arkenv/build.gradle.kts
@@ -1,7 +1,7 @@
 plugins {
     base
-    kotlin("jvm") version "1.4.32"
-    id("org.jetbrains.dokka") version "1.4.32"
+    kotlin("jvm") version "1.5.10"
+    id("org.jetbrains.dokka") version "1.5.0"
     id("java-test-fixtures")
     signing
 }
@@ -24,6 +24,7 @@ dependencies {
     testFixturesApi("org.jmockit:jmockit:$jmockitVersion")
     testFixturesApi("org.amshove.kluent:kluent:$kluentVersion")
     testFixturesApi("org.junit.jupiter:junit-jupiter-api:$junitVersion")
+    testFixturesApi("org.junit.jupiter:junit-jupiter-params:$junitVersion")
     testFixturesApi("io.strikt:strikt-core:$striktVersion")
 
     testImplementation(testFixtures(project(":arkenv")))
diff --git a/arkenv/src/main/kotlin/com/apurebase/arkenv/ArkenvMapper.kt b/arkenv/src/main/kotlin/com/apurebase/arkenv/ArkenvMapper.kt
index 02cab3d..99b619f 100644
--- a/arkenv/src/main/kotlin/com/apurebase/arkenv/ArkenvMapper.kt
+++ b/arkenv/src/main/kotlin/com/apurebase/arkenv/ArkenvMapper.kt
@@ -31,6 +31,7 @@ internal object ArkenvMapper {
         Long::class -> toLongOrNull()
         String::class -> this
         Char::class -> firstOrNull()
+        Boolean::class -> toBoolean() || this == "1"
         List::class, Collection::class -> split()
         IntArray::class -> split().map(String::toInt).toIntArray()
         ShortArray::class -> split().map(String::toShort).toShortArray()
diff --git a/arkenv/src/test/kotlin/com/apurebase/arkenv/ParseClassTests.kt b/arkenv/src/test/kotlin/com/apurebase/arkenv/ParseClassTests.kt
index e67d688..66eee06 100644
--- a/arkenv/src/test/kotlin/com/apurebase/arkenv/ParseClassTests.kt
+++ b/arkenv/src/test/kotlin/com/apurebase/arkenv/ParseClassTests.kt
@@ -5,9 +5,13 @@ import com.apurebase.arkenv.test.Expected
 import com.apurebase.arkenv.util.argument
 import com.apurebase.arkenv.util.parse
 import org.junit.jupiter.api.Test
+import org.junit.jupiter.params.ParameterizedTest
+import org.junit.jupiter.params.provider.ValueSource
 import strikt.api.expectThat
 import strikt.assertions.isEqualTo
+import strikt.assertions.isFalse
 import strikt.assertions.isNull
+import strikt.assertions.isTrue
 
 /**
  * Tests for the [ArkenvParser.parseClass] functionality, parsing plain classes.
@@ -94,4 +98,30 @@ class ParseClassTests {
             get { databasePort } isEqualTo Expected.databasePort
         }
     }
+
+    @ParameterizedTest
+    @ValueSource(strings = ["true", "1"])
+    fun `boolean true`(input: String) {
+        // Arrange
+        class Configuration(val headless: Boolean = false)
+
+        // Act
+        val config = Arkenv.parse<Configuration>(arrayOf("--headless", input))
+
+        // Assert
+        expectThat(config) { get { headless }.isTrue() }
+    }
+
+    @ParameterizedTest
+    @ValueSource(strings = ["false", "0", ""])
+    fun `boolean false`(input: String) {
+        // Arrange
+        class Configuration(val headless: Boolean = false)
+
+        // Act
+        val config = Arkenv.parse<Configuration>(arrayOf("--headless", input))
+
+        // Assert
+        expectThat(config) { get { headless }.isFalse() }
+    }
 }
diff --git a/gradle.properties b/gradle.properties
index 3096b94..082706a 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,5 +1,5 @@
 group=com.apurebase
-version=3.3.1
+version=3.3.2
 
 # Versions
 junitVersion=5.7.1
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 0f80bbf..69a9715 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.0.2-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists