diff --git a/build-logic/src/main/kotlin/okhttp.quality-conventions.gradle.kts b/build-logic/src/main/kotlin/okhttp.quality-conventions.gradle.kts
index 5af682f195a5..e8c9b00fc936 100644
--- a/build-logic/src/main/kotlin/okhttp.quality-conventions.gradle.kts
+++ b/build-logic/src/main/kotlin/okhttp.quality-conventions.gradle.kts
@@ -1,8 +1,6 @@
 import com.vanniktech.maven.publish.MavenPublishBaseExtension
-import ru.vyarus.gradle.plugin.animalsniffer.AnimalSnifferExtension
-import org.gradle.api.artifacts.VersionCatalogsExtension
-import org.gradle.kotlin.dsl.withType
 import ru.vyarus.gradle.plugin.animalsniffer.AnimalSniffer
+import ru.vyarus.gradle.plugin.animalsniffer.AnimalSnifferExtension
 
 plugins {
   id("okhttp.base-conventions")
@@ -55,6 +53,15 @@ configure<AnimalSnifferExtension> {
 
   signatures = androidSignature + jvmSignature
   failWithoutSignatures = false
+
+  // Android API 21 doesn't have Boolean.hashCode() (etc.) but the Android SDK will desugar these.
+  // https://r8.googlesource.com/r8/+/516a6684f134d06eff08080e7ef7129517071817
+  ignore(
+    "java.lang.Boolean",
+    "java.lang.Integer",
+    "java.lang.Long",
+    "java.lang.Short",
+  )
 }
 
 // Default to only published modules
diff --git a/okhttp-tls/src/main/kotlin/okhttp3/tls/internal/der/AnyValue.kt b/okhttp-tls/src/main/kotlin/okhttp3/tls/internal/der/AnyValue.kt
index 393946f9b5ef..ed7872f1faa2 100644
--- a/okhttp-tls/src/main/kotlin/okhttp3/tls/internal/der/AnyValue.kt
+++ b/okhttp-tls/src/main/kotlin/okhttp3/tls/internal/der/AnyValue.kt
@@ -27,15 +27,4 @@ internal data class AnyValue(
   var constructed: Boolean = false,
   var length: Long = -1L,
   val bytes: ByteString,
-) {
-  // Avoid Long.hashCode(long) which isn't available on Android 5.
-  override fun hashCode(): Int {
-    var result = 0
-    result = 31 * result + tagClass
-    result = 31 * result + tag.toInt()
-    result = 31 * result + (if (constructed) 0 else 1)
-    result = 31 * result + length.toInt()
-    result = 31 * result + bytes.hashCode()
-    return result
-  }
-}
+)
diff --git a/okhttp-tls/src/main/kotlin/okhttp3/tls/internal/der/BasicDerAdapter.kt b/okhttp-tls/src/main/kotlin/okhttp3/tls/internal/der/BasicDerAdapter.kt
index cf90b0aa369e..14c732d055f9 100644
--- a/okhttp-tls/src/main/kotlin/okhttp3/tls/internal/der/BasicDerAdapter.kt
+++ b/okhttp-tls/src/main/kotlin/okhttp3/tls/internal/der/BasicDerAdapter.kt
@@ -117,19 +117,6 @@ internal data class BasicDerAdapter<T>(
    */
   fun asTypeHint(): BasicDerAdapter<T> = copy(typeHint = true)
 
-  // Avoid Long.hashCode(long) which isn't available on Android 5.
-  override fun hashCode(): Int {
-    var result = 0
-    result = 31 * result + name.hashCode()
-    result = 31 * result + tagClass
-    result = 31 * result + tag.toInt()
-    result = 31 * result + codec.hashCode()
-    result = 31 * result + (if (isOptional) 1 else 0)
-    result = 31 * result + defaultValue.hashCode()
-    result = 31 * result + (if (typeHint) 1 else 0)
-    return result
-  }
-
   override fun toString(): String = "$name [$tagClass/$tag]"
 
   /** Reads and writes values without knowledge of the enclosing tag, length, or defaults. */
diff --git a/okhttp-tls/src/main/kotlin/okhttp3/tls/internal/der/BitString.kt b/okhttp-tls/src/main/kotlin/okhttp3/tls/internal/der/BitString.kt
index 1fc406d9dea8..2409a09a5ad3 100644
--- a/okhttp-tls/src/main/kotlin/okhttp3/tls/internal/der/BitString.kt
+++ b/okhttp-tls/src/main/kotlin/okhttp3/tls/internal/der/BitString.kt
@@ -24,12 +24,4 @@ internal data class BitString(
   val byteString: ByteString,
   /** 0-7 unused bits in the last byte. */
   val unusedBitsCount: Int,
-) {
-  // Avoid Long.hashCode(long) which isn't available on Android 5.
-  override fun hashCode(): Int {
-    var result = 0
-    result = 31 * result + byteString.hashCode()
-    result = 31 * result + unusedBitsCount
-    return result
-  }
-}
+)
diff --git a/okhttp-tls/src/main/kotlin/okhttp3/tls/internal/der/Certificate.kt b/okhttp-tls/src/main/kotlin/okhttp3/tls/internal/der/Certificate.kt
index 4e69cc7b8e94..520abe63f3e2 100644
--- a/okhttp-tls/src/main/kotlin/okhttp3/tls/internal/der/Certificate.kt
+++ b/okhttp-tls/src/main/kotlin/okhttp3/tls/internal/der/Certificate.kt
@@ -148,15 +148,7 @@ internal data class AttributeTypeAndValue(
 internal data class Validity(
   val notBefore: Long,
   val notAfter: Long,
-) {
-  // Avoid Long.hashCode(long) which isn't available on Android 5.
-  override fun hashCode(): Int {
-    var result = 0
-    result = 31 * result + notBefore.toInt()
-    result = 31 * result + notAfter.toInt()
-    return result
-  }
-}
+)
 
 internal data class SubjectPublicKeyInfo(
   val algorithm: AlgorithmIdentifier,
@@ -184,13 +176,4 @@ internal data class PrivateKeyInfo(
   val version: Long,
   val algorithmIdentifier: AlgorithmIdentifier,
   val privateKey: ByteString,
-) {
-  // Avoid Long.hashCode(long) which isn't available on Android 5.
-  override fun hashCode(): Int {
-    var result = 0
-    result = 31 * result + version.toInt()
-    result = 31 * result + algorithmIdentifier.hashCode()
-    result = 31 * result + privateKey.hashCode()
-    return result
-  }
-}
+)
diff --git a/okhttp-tls/src/main/kotlin/okhttp3/tls/internal/der/DerHeader.kt b/okhttp-tls/src/main/kotlin/okhttp3/tls/internal/der/DerHeader.kt
index 8bfc76106532..2f448a0b9995 100644
--- a/okhttp-tls/src/main/kotlin/okhttp3/tls/internal/der/DerHeader.kt
+++ b/okhttp-tls/src/main/kotlin/okhttp3/tls/internal/der/DerHeader.kt
@@ -52,16 +52,6 @@ internal data class DerHeader(
   val isEndOfData: Boolean
     get() = tagClass == TAG_CLASS_UNIVERSAL && tag == TAG_END_OF_CONTENTS
 
-  // Avoid Long.hashCode(long) which isn't available on Android 5.
-  override fun hashCode(): Int {
-    var result = 0
-    result = 31 * result + tagClass
-    result = 31 * result + tag.toInt()
-    result = 31 * result + (if (constructed) 0 else 1)
-    result = 31 * result + length.toInt()
-    return result
-  }
-
   override fun toString(): String = "$tagClass/$tag"
 
   companion object {
diff --git a/okhttp/src/commonJvmAndroid/kotlin/okhttp3/internal/dns/-DnsMessage.kt b/okhttp/src/commonJvmAndroid/kotlin/okhttp3/internal/dns/-DnsMessage.kt
index a0b1786cd96f..df84b9fe4404 100644
--- a/okhttp/src/commonJvmAndroid/kotlin/okhttp3/internal/dns/-DnsMessage.kt
+++ b/okhttp/src/commonJvmAndroid/kotlin/okhttp3/internal/dns/-DnsMessage.kt
@@ -33,18 +33,6 @@ data class DnsMessage(
   val responseCode: Int
     get() = (flags and 0b0000_0000_0000_1111)
 
-  // Avoid Short.hashCode(short) which isn't available on Android 5.
-  override fun hashCode(): Int {
-    var result = 0
-    result = 31 * result + id
-    result = 31 * result + flags
-    result = 31 * result + questions.hashCode()
-    result = 31 * result + answers.hashCode()
-    result = 31 * result + authorityRecords.hashCode()
-    result = 31 * result + additionalRecords.hashCode()
-    return result
-  }
-
   companion object {
     fun query(
       hostname: String,
@@ -74,16 +62,7 @@ data class Question(
   val name: String,
   val type: Int,
   val `class`: Int = CLASS_IN,
-) {
-  // Avoid Short.hashCode(short) which isn't available on Android 5.
-  override fun hashCode(): Int {
-    var result = 0
-    result = 31 * result + name.hashCode()
-    result = 31 * result + type
-    result = 31 * result + `class`
-    return result
-  }
-}
+)
 
 sealed interface ResourceRecord {
   val name: String
@@ -93,16 +72,7 @@ sealed interface ResourceRecord {
     override val name: String,
     override val timeToLive: Int,
     val address: InetAddress,
-  ) : ResourceRecord {
-    // Avoid Int.hashCode(int) which isn't available on Android 5.
-    override fun hashCode(): Int {
-      var result = 0
-      result = 31 * result + name.hashCode()
-      result = 31 * result + timeToLive
-      result = 31 * result + address.hashCode()
-      return result
-    }
-  }
+  ) : ResourceRecord
 
   data class Https(
     override val name: String,
@@ -113,21 +83,7 @@ sealed interface ResourceRecord {
     var port: Int = 443,
     val ipAddressHints: List<InetAddress> = listOf(),
     val echConfigList: ByteString? = null,
-  ) : ResourceRecord {
-    // Avoid Int.hashCode(int) which isn't available on Android 5.
-    override fun hashCode(): Int {
-      var result = 0
-      result = 31 * result + name.hashCode()
-      result = 31 * result + timeToLive
-      result = 31 * result + priority
-      result = 31 * result + targetName.hashCode()
-      result = 31 * result + alpnIds.hashCode()
-      result = 31 * result + port
-      result = 31 * result + ipAddressHints.hashCode()
-      result = 31 * result + echConfigList.hashCode()
-      return result
-    }
-  }
+  ) : ResourceRecord
 }
 
 /** https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4 */