diff --git a/CHANGELOG.md b/CHANGELOG.md
index d894e20a00e..8be6cc64701 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,9 @@
 
 ### Breaking Changes
 
+- Use String instead of UUID for SessionId ([#3834](https://github.com/getsentry/sentry-java/pull/3834))
+  - The `Session` constructor now takes a `String` instead of a `UUID` for the `sessionId` parameter.
+  - `Session.getSessionId()` now returns a `String` instead of a `UUID`.
 - The Android minSdk level for all Android modules is now 21 ([#3852](https://github.com/getsentry/sentry-java/pull/3852))
 - The minSdk level for sentry-android-ndk changed from 19 to 21 ([#3851](https://github.com/getsentry/sentry-java/pull/3851))
 
diff --git a/sentry-android-core/src/test/java/io/sentry/android/core/LifecycleWatcherTest.kt b/sentry-android-core/src/test/java/io/sentry/android/core/LifecycleWatcherTest.kt
index 93a731481b1..5613c8eb1f7 100644
--- a/sentry-android-core/src/test/java/io/sentry/android/core/LifecycleWatcherTest.kt
+++ b/sentry-android-core/src/test/java/io/sentry/android/core/LifecycleWatcherTest.kt
@@ -195,7 +195,7 @@ class LifecycleWatcherTest {
                 DateUtils.getCurrentDateTime(),
                 0,
                 "abc",
-                UUID.fromString("3c1ffc32-f68f-4af2-a1ee-dd72f4d62d17"),
+                "3c1ffc32-f68f-4af2-a1ee-dd72f4d62d17",
                 true,
                 0,
                 10.0,
@@ -222,7 +222,7 @@ class LifecycleWatcherTest {
                 DateUtils.getDateTime(-1),
                 0,
                 "abc",
-                UUID.fromString("3c1ffc32-f68f-4af2-a1ee-dd72f4d62d17"),
+                "3c1ffc32-f68f-4af2-a1ee-dd72f4d62d17",
                 true,
                 0,
                 10.0,
@@ -263,7 +263,7 @@ class LifecycleWatcherTest {
                 DateUtils.getCurrentDateTime(),
                 0,
                 "abc",
-                UUID.fromString("3c1ffc32-f68f-4af2-a1ee-dd72f4d62d17"),
+                "3c1ffc32-f68f-4af2-a1ee-dd72f4d62d17",
                 true,
                 0,
                 10.0,
diff --git a/sentry/api/sentry.api b/sentry/api/sentry.api
index cd641fe9356..57bb67df6a2 100644
--- a/sentry/api/sentry.api
+++ b/sentry/api/sentry.api
@@ -3277,7 +3277,7 @@ public final class io/sentry/SentryWrapper {
 }
 
 public final class io/sentry/Session : io/sentry/JsonSerializable, io/sentry/JsonUnknown {
-	public fun <init> (Lio/sentry/Session$State;Ljava/util/Date;Ljava/util/Date;ILjava/lang/String;Ljava/util/UUID;Ljava/lang/Boolean;Ljava/lang/Long;Ljava/lang/Double;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V
+	public fun <init> (Lio/sentry/Session$State;Ljava/util/Date;Ljava/util/Date;ILjava/lang/String;Ljava/lang/String;Ljava/lang/Boolean;Ljava/lang/Long;Ljava/lang/Double;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V
 	public fun <init> (Ljava/lang/String;Lio/sentry/protocol/User;Ljava/lang/String;Ljava/lang/String;)V
 	public fun clone ()Lio/sentry/Session;
 	public synthetic fun clone ()Ljava/lang/Object;
@@ -3292,7 +3292,7 @@ public final class io/sentry/Session : io/sentry/JsonSerializable, io/sentry/Jso
 	public fun getIpAddress ()Ljava/lang/String;
 	public fun getRelease ()Ljava/lang/String;
 	public fun getSequence ()Ljava/lang/Long;
-	public fun getSessionId ()Ljava/util/UUID;
+	public fun getSessionId ()Ljava/lang/String;
 	public fun getStarted ()Ljava/util/Date;
 	public fun getStatus ()Lio/sentry/Session$State;
 	public fun getTimestamp ()Ljava/util/Date;
diff --git a/sentry/src/main/java/io/sentry/Session.java b/sentry/src/main/java/io/sentry/Session.java
index 5ea37a74cd2..3ce2d70e89e 100644
--- a/sentry/src/main/java/io/sentry/Session.java
+++ b/sentry/src/main/java/io/sentry/Session.java
@@ -8,7 +8,6 @@
 import java.util.Date;
 import java.util.Locale;
 import java.util.Map;
-import java.util.UUID;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.atomic.AtomicInteger;
 import org.jetbrains.annotations.ApiStatus;
@@ -38,7 +37,7 @@ public enum State {
   private final @Nullable String distinctId;
 
   /** the SessionId, sid */
-  private final @Nullable UUID sessionId;
+  private final @Nullable String sessionId;
 
   /** The session init flag */
   private @Nullable Boolean init;
@@ -79,7 +78,7 @@ public Session(
       final @Nullable Date timestamp,
       final int errorCount,
       final @Nullable String distinctId,
-      final @Nullable UUID sessionId,
+      final @Nullable String sessionId,
       final @Nullable Boolean init,
       final @Nullable Long sequence,
       final @Nullable Double duration,
@@ -115,7 +114,7 @@ public Session(
         DateUtils.getCurrentDateTime(),
         0,
         distinctId,
-        UUID.randomUUID(),
+        SentryUUID.generateSentryId(),
         true,
         null,
         null,
@@ -142,7 +141,7 @@ public boolean isTerminated() {
     return distinctId;
   }
 
-  public @Nullable UUID getSessionId() {
+  public @Nullable String getSessionId() {
     return sessionId;
   }
 
@@ -366,7 +365,7 @@ public void serialize(final @NotNull ObjectWriter writer, final @NotNull ILogger
       throws IOException {
     writer.beginObject();
     if (sessionId != null) {
-      writer.name(JsonKeys.SID).value(sessionId.toString());
+      writer.name(JsonKeys.SID).value(sessionId);
     }
     if (distinctId != null) {
       writer.name(JsonKeys.DID).value(distinctId);
@@ -435,7 +434,7 @@ public static final class Deserializer implements JsonDeserializer<Session> {
       Date timestamp = null;
       Integer errorCount = null; // @NotNull
       String distinctId = null;
-      UUID sessionId = null;
+      String sessionId = null;
       Boolean init = null;
       State status = null; // @NotNull
       Long sequence = null;
@@ -451,12 +450,11 @@ public static final class Deserializer implements JsonDeserializer<Session> {
         final String nextName = reader.nextName();
         switch (nextName) {
           case JsonKeys.SID:
-            String sidString = null;
-            try {
-              sidString = reader.nextStringOrNull();
-              sessionId = UUID.fromString(sidString);
-            } catch (IllegalArgumentException e) {
-              logger.log(SentryLevel.ERROR, "%s sid is not valid.", sidString);
+            String sid = reader.nextStringOrNull();
+            if (sid != null && (sid.length() == 36 || sid.length() == 32)) {
+              sessionId = sid;
+            } else {
+              logger.log(SentryLevel.ERROR, "%s sid is not valid.", sid);
             }
             break;
           case JsonKeys.DID:
diff --git a/sentry/src/main/java/io/sentry/cache/CacheStrategy.java b/sentry/src/main/java/io/sentry/cache/CacheStrategy.java
index d48cc3108dd..479c0e42eaf 100644
--- a/sentry/src/main/java/io/sentry/cache/CacheStrategy.java
+++ b/sentry/src/main/java/io/sentry/cache/CacheStrategy.java
@@ -28,7 +28,6 @@
 import java.util.Arrays;
 import java.util.Iterator;
 import java.util.List;
-import java.util.UUID;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
@@ -242,7 +241,7 @@ private boolean isValidSession(final @NotNull Session session) {
       return false;
     }
 
-    final UUID sessionId = session.getSessionId();
+    final String sessionId = session.getSessionId();
 
     return sessionId != null;
   }
diff --git a/sentry/src/test/java/io/sentry/CombinedScopeViewTest.kt b/sentry/src/test/java/io/sentry/CombinedScopeViewTest.kt
index 0b6d39c0dd7..cbb8ed0e9cd 100644
--- a/sentry/src/test/java/io/sentry/CombinedScopeViewTest.kt
+++ b/sentry/src/test/java/io/sentry/CombinedScopeViewTest.kt
@@ -16,7 +16,6 @@ import org.mockito.kotlin.same
 import org.mockito.kotlin.verify
 import org.mockito.kotlin.whenever
 import java.lang.RuntimeException
-import java.util.UUID
 import kotlin.test.Test
 import kotlin.test.assertEquals
 import kotlin.test.assertNotNull
@@ -933,9 +932,9 @@ class CombinedScopeViewTest {
     @Test
     fun `retrieves last event id from global scope`() {
         val combined = fixture.getSut()
-        fixture.scope.lastEventId = SentryId(UUID.fromString("c81d4e2e-bcf2-11e6-869b-7df92533d2dc"))
-        fixture.isolationScope.lastEventId = SentryId(UUID.fromString("d81d4e2e-bcf2-11e6-869b-7df92533d2dd"))
-        fixture.globalScope.lastEventId = SentryId(UUID.fromString("e81d4e2e-bcf2-11e6-869b-7df92533d2de"))
+        fixture.scope.lastEventId = SentryId("c81d4e2e-bcf2-11e6-869b-7df92533d2dc")
+        fixture.isolationScope.lastEventId = SentryId("d81d4e2e-bcf2-11e6-869b-7df92533d2dd")
+        fixture.globalScope.lastEventId = SentryId("e81d4e2e-bcf2-11e6-869b-7df92533d2de")
 
         assertEquals("e81d4e2ebcf211e6869b7df92533d2de", combined.lastEventId.toString())
     }
@@ -943,7 +942,7 @@ class CombinedScopeViewTest {
     @Test
     fun `sets last event id on all scopes`() {
         val combined = fixture.getSut()
-        combined.lastEventId = SentryId(UUID.fromString("c81d4e2e-bcf2-11e6-869b-7df92533d2db"))
+        combined.lastEventId = SentryId("c81d4e2e-bcf2-11e6-869b-7df92533d2db")
 
         assertEquals("c81d4e2ebcf211e6869b7df92533d2db", fixture.scope.lastEventId.toString())
         assertEquals("c81d4e2ebcf211e6869b7df92533d2db", fixture.isolationScope.lastEventId.toString())
@@ -953,9 +952,9 @@ class CombinedScopeViewTest {
     @Test
     fun `retrieves propagation context from default scope`() {
         val combined = fixture.getSut()
-        fixture.scope.propagationContext = PropagationContext().also { it.traceId = SentryId(UUID.fromString("c81d4e2e-bcf2-11e6-869b-7df92533d2dc")) }
-        fixture.isolationScope.propagationContext = PropagationContext().also { it.traceId = SentryId(UUID.fromString("d81d4e2e-bcf2-11e6-869b-7df92533d2dd")) }
-        fixture.globalScope.propagationContext = PropagationContext().also { it.traceId = SentryId(UUID.fromString("e81d4e2e-bcf2-11e6-869b-7df92533d2de")) }
+        fixture.scope.propagationContext = PropagationContext().also { it.traceId = SentryId("c81d4e2e-bcf2-11e6-869b-7df92533d2dc") }
+        fixture.isolationScope.propagationContext = PropagationContext().also { it.traceId = SentryId("d81d4e2e-bcf2-11e6-869b-7df92533d2dd") }
+        fixture.globalScope.propagationContext = PropagationContext().also { it.traceId = SentryId("e81d4e2e-bcf2-11e6-869b-7df92533d2de") }
 
         assertEquals(ScopeType.ISOLATION, fixture.options.defaultScopeType)
         assertEquals("d81d4e2ebcf211e6869b7df92533d2dd", combined.propagationContext.traceId.toString())
@@ -965,7 +964,7 @@ class CombinedScopeViewTest {
     fun `sets propagation context on default scope`() {
         val combined = fixture.getSut()
 
-        combined.propagationContext = PropagationContext().also { it.traceId = SentryId(UUID.fromString("c81d4e2e-bcf2-11e6-869b-7df92533d2db")) }
+        combined.propagationContext = PropagationContext().also { it.traceId = SentryId("c81d4e2e-bcf2-11e6-869b-7df92533d2db") }
 
         assertEquals(ScopeType.ISOLATION, fixture.options.defaultScopeType)
         assertNotEquals("c81d4e2ebcf211e6869b7df92533d2db", fixture.scope.propagationContext.traceId.toString())
@@ -976,9 +975,9 @@ class CombinedScopeViewTest {
     @Test
     fun `withPropagationContext uses default scope`() {
         val combined = fixture.getSut()
-        fixture.scope.propagationContext = PropagationContext().also { it.traceId = SentryId(UUID.fromString("c81d4e2e-bcf2-11e6-869b-7df92533d2dc")) }
-        fixture.isolationScope.propagationContext = PropagationContext().also { it.traceId = SentryId(UUID.fromString("d81d4e2e-bcf2-11e6-869b-7df92533d2dd")) }
-        fixture.globalScope.propagationContext = PropagationContext().also { it.traceId = SentryId(UUID.fromString("e81d4e2e-bcf2-11e6-869b-7df92533d2de")) }
+        fixture.scope.propagationContext = PropagationContext().also { it.traceId = SentryId("c81d4e2e-bcf2-11e6-869b-7df92533d2dc") }
+        fixture.isolationScope.propagationContext = PropagationContext().also { it.traceId = SentryId("d81d4e2e-bcf2-11e6-869b-7df92533d2dd") }
+        fixture.globalScope.propagationContext = PropagationContext().also { it.traceId = SentryId("e81d4e2e-bcf2-11e6-869b-7df92533d2de") }
 
         var capturedPropagationContext: PropagationContext? = null
         combined.withPropagationContext { propagationContext ->
diff --git a/sentry/src/test/java/io/sentry/JsonObjectSerializerTest.kt b/sentry/src/test/java/io/sentry/JsonObjectSerializerTest.kt
index cca66f1de23..83634bc0fe0 100644
--- a/sentry/src/test/java/io/sentry/JsonObjectSerializerTest.kt
+++ b/sentry/src/test/java/io/sentry/JsonObjectSerializerTest.kt
@@ -10,7 +10,6 @@ import java.util.Calendar
 import java.util.Currency
 import java.util.Locale
 import java.util.TimeZone
-import java.util.UUID
 import java.util.concurrent.atomic.AtomicBoolean
 import java.util.concurrent.atomic.AtomicIntegerArray
 
@@ -240,7 +239,7 @@ internal class JsonObjectSerializerTest {
 
     @Test
     fun `serializing UUID`() {
-        fixture.getSUT().serialize(fixture.writer, fixture.logger, UUID.fromString("828900a5-15dc-413f-8c17-6ef04d74e074"))
+        fixture.getSUT().serialize(fixture.writer, fixture.logger, "828900a5-15dc-413f-8c17-6ef04d74e074")
         verify(fixture.writer).value("828900a5-15dc-413f-8c17-6ef04d74e074")
     }
 
diff --git a/sentry/src/test/java/io/sentry/JsonReflectionObjectSerializerTest.kt b/sentry/src/test/java/io/sentry/JsonReflectionObjectSerializerTest.kt
index 7ea3e2b594f..9a71707ce25 100644
--- a/sentry/src/test/java/io/sentry/JsonReflectionObjectSerializerTest.kt
+++ b/sentry/src/test/java/io/sentry/JsonReflectionObjectSerializerTest.kt
@@ -7,7 +7,6 @@ import java.net.URI
 import java.util.Calendar
 import java.util.Currency
 import java.util.Locale
-import java.util.UUID
 import java.util.concurrent.atomic.AtomicBoolean
 import java.util.concurrent.atomic.AtomicIntegerArray
 import kotlin.test.assertEquals
@@ -318,7 +317,7 @@ class JsonReflectionObjectSerializerTest {
 
     @Test
     fun `UUID is serialized`() {
-        val actual = fixture.getSut().serialize(UUID.fromString("828900a5-15dc-413f-8c17-6ef04d74e074"), fixture.logger)
+        val actual = fixture.getSut().serialize("828900a5-15dc-413f-8c17-6ef04d74e074", fixture.logger)
         assertEquals("828900a5-15dc-413f-8c17-6ef04d74e074", actual)
     }
 
diff --git a/sentry/src/test/java/io/sentry/JsonSerializerTest.kt b/sentry/src/test/java/io/sentry/JsonSerializerTest.kt
index 2a8a8a3443a..e9d12ff4b17 100644
--- a/sentry/src/test/java/io/sentry/JsonSerializerTest.kt
+++ b/sentry/src/test/java/io/sentry/JsonSerializerTest.kt
@@ -371,6 +371,17 @@ class JsonSerializerTest {
         assertSessionData(expectedSession)
     }
 
+    @Test
+    fun `session deserializes 32 character id`() {
+        val sessionId = "c81d4e2ebcf211e6869b7df92533d2db"
+        val session = createSessionMockData("c81d4e2ebcf211e6869b7df92533d2db")
+        val jsonSession = serializeToString(session)
+        // reversing, so we can assert values and not a json string
+        val expectedSession = fixture.serializer.deserialize(StringReader(jsonSession), Session::class.java)
+
+        assertSessionData(expectedSession, "c81d4e2ebcf211e6869b7df92533d2db")
+    }
+
     @Test
     fun `When deserializing an Envelope, all the values should be set to the SentryEnvelope object`() {
         val jsonEnvelope = FileFromResources.invoke("envelope_session.txt")
@@ -1248,9 +1259,9 @@ class JsonSerializerTest {
         assertEquals(replayRecording, deserializedRecording)
     }
 
-    private fun assertSessionData(expectedSession: Session?) {
+    private fun assertSessionData(expectedSession: Session?, expectedSessionId: String = "c81d4e2e-bcf2-11e6-869b-7df92533d2db") {
         assertNotNull(expectedSession)
-        assertEquals(UUID.fromString("c81d4e2e-bcf2-11e6-869b-7df92533d2db"), expectedSession.sessionId)
+        assertEquals(expectedSessionId, expectedSession.sessionId)
         assertEquals("123", expectedSession.distinctId)
         assertTrue(expectedSession.init!!)
         assertEquals("2020-02-07T14:16:00.000Z", DateUtils.getTimestamp(expectedSession.started!!))
@@ -1280,14 +1291,14 @@ class JsonSerializerTest {
     private fun generateEmptySentryEvent(date: Date = Date()): SentryEvent =
         SentryEvent(date)
 
-    private fun createSessionMockData(): Session =
+    private fun createSessionMockData(sessionId: String = "c81d4e2e-bcf2-11e6-869b-7df92533d2db"): Session =
         Session(
             Session.State.Ok,
             DateUtils.getDateTime("2020-02-07T14:16:00.000Z"),
             DateUtils.getDateTime("2020-02-07T14:16:00.000Z"),
             2,
             "123",
-            UUID.fromString("c81d4e2e-bcf2-11e6-869b-7df92533d2db"),
+            sessionId,
             true,
             123456.toLong(),
             6000.toDouble(),
diff --git a/sentry/src/test/java/io/sentry/OutboxSenderTest.kt b/sentry/src/test/java/io/sentry/OutboxSenderTest.kt
index ad4d40eeaf6..8a1850e7ddc 100644
--- a/sentry/src/test/java/io/sentry/OutboxSenderTest.kt
+++ b/sentry/src/test/java/io/sentry/OutboxSenderTest.kt
@@ -20,7 +20,6 @@ import java.io.FileNotFoundException
 import java.nio.file.Files
 import java.nio.file.Paths
 import java.util.Date
-import java.util.UUID
 import kotlin.test.Test
 import kotlin.test.assertEquals
 import kotlin.test.assertFalse
@@ -74,7 +73,7 @@ class OutboxSenderTest {
     @Test
     fun `when parser is EnvelopeReader and serializer returns SentryEvent, event captured, file is deleted `() {
         fixture.envelopeReader = EnvelopeReader(JsonSerializer(fixture.options))
-        val expected = SentryEvent(SentryId(UUID.fromString("9ec79c33-ec99-42ab-8353-589fcb2e04dc")), Date())
+        val expected = SentryEvent(SentryId("9ec79c33-ec99-42ab-8353-589fcb2e04dc"), Date())
         whenever(fixture.serializer.deserialize(any(), eq(SentryEvent::class.java))).thenReturn(expected)
         val sut = fixture.getSut()
         val path = getTempEnvelope()
diff --git a/sentry/src/test/java/io/sentry/SessionAdapterTest.kt b/sentry/src/test/java/io/sentry/SessionAdapterTest.kt
index 0709d77828c..0f29942e360 100644
--- a/sentry/src/test/java/io/sentry/SessionAdapterTest.kt
+++ b/sentry/src/test/java/io/sentry/SessionAdapterTest.kt
@@ -5,7 +5,6 @@ import org.mockito.kotlin.mock
 import java.io.StringReader
 import java.io.StringWriter
 import java.lang.Exception
-import java.util.UUID
 import kotlin.test.Test
 import kotlin.test.assertEquals
 import kotlin.test.assertFailsWith
@@ -23,7 +22,7 @@ class SessionAdapterTest {
             null,
             2,
             "123",
-            UUID.fromString("c81d4e2e-bcf2-11e6-869b-7df92533d2db"),
+            "c81d4e2e-bcf2-11e6-869b-7df92533d2db",
             true,
             123456.toLong(),
             6000.toDouble(),
@@ -47,7 +46,7 @@ class SessionAdapterTest {
             null,
             2,
             "123",
-            UUID.fromString("c81d4e2e-bcf2-11e6-869b-7df92533d2db"),
+            "c81d4e2e-bcf2-11e6-869b-7df92533d2db",
             true,
             123456.toLong(),
             6000.toDouble(),
@@ -71,7 +70,7 @@ class SessionAdapterTest {
             DateUtils.getDateTime("2020-02-07T14:16:00.001Z"),
             2,
             null,
-            UUID.fromString("c81d4e2e-bcf2-11e6-869b-7df92533d2db"),
+            "c81d4e2e-bcf2-11e6-869b-7df92533d2db",
             true,
             123456.toLong(),
             6000.toDouble(),
@@ -95,7 +94,7 @@ class SessionAdapterTest {
             DateUtils.getDateTime("2020-02-07T14:16:00.001Z"),
             2,
             "123",
-            UUID.fromString("c81d4e2e-bcf2-11e6-869b-7df92533d2db"),
+            "c81d4e2e-bcf2-11e6-869b-7df92533d2db",
             null,
             123456.toLong(),
             6000.toDouble(),
@@ -119,7 +118,7 @@ class SessionAdapterTest {
             DateUtils.getDateTime("2020-02-07T14:16:00.001Z"),
             2,
             "123",
-            UUID.fromString("c81d4e2e-bcf2-11e6-869b-7df92533d2db"),
+            "c81d4e2e-bcf2-11e6-869b-7df92533d2db",
             true,
             null,
             6000.toDouble(),
@@ -143,7 +142,7 @@ class SessionAdapterTest {
             DateUtils.getDateTime("2020-02-07T14:16:00.001Z"),
             2,
             "123",
-            UUID.fromString("c81d4e2e-bcf2-11e6-869b-7df92533d2db"),
+            "c81d4e2e-bcf2-11e6-869b-7df92533d2db",
             true,
             123456.toLong(),
             null,
@@ -167,7 +166,7 @@ class SessionAdapterTest {
             DateUtils.getDateTime("2020-02-07T14:16:00.001Z"),
             2,
             "123",
-            UUID.fromString("c81d4e2e-bcf2-11e6-869b-7df92533d2db"),
+            "c81d4e2e-bcf2-11e6-869b-7df92533d2db",
             true,
             123456.toLong(),
             6000.toDouble(),
@@ -191,7 +190,7 @@ class SessionAdapterTest {
             DateUtils.getDateTime("2020-02-07T14:16:00.001Z"),
             2,
             "123",
-            UUID.fromString("c81d4e2e-bcf2-11e6-869b-7df92533d2db"),
+            "c81d4e2e-bcf2-11e6-869b-7df92533d2db",
             true,
             123456.toLong(),
             6000.toDouble(),
@@ -215,7 +214,7 @@ class SessionAdapterTest {
             DateUtils.getDateTime("2020-02-07T14:16:00.001Z"),
             2,
             "123",
-            UUID.fromString("c81d4e2e-bcf2-11e6-869b-7df92533d2db"),
+            "c81d4e2e-bcf2-11e6-869b-7df92533d2db",
             true,
             123456.toLong(),
             6000.toDouble(),
@@ -239,7 +238,7 @@ class SessionAdapterTest {
             DateUtils.getDateTime("2020-02-07T14:16:00.001Z"),
             2,
             "123",
-            UUID.fromString("c81d4e2e-bcf2-11e6-869b-7df92533d2db"),
+            "c81d4e2e-bcf2-11e6-869b-7df92533d2db",
             true,
             123456.toLong(),
             6000.toDouble(),
@@ -263,7 +262,7 @@ class SessionAdapterTest {
             DateUtils.getDateTime("2020-02-07T14:16:00.001Z"),
             2,
             "123",
-            UUID.fromString("c81d4e2e-bcf2-11e6-869b-7df92533d2db"),
+            "c81d4e2e-bcf2-11e6-869b-7df92533d2db",
             true,
             123456.toLong(),
             6000.toDouble(),
@@ -287,7 +286,7 @@ class SessionAdapterTest {
             DateUtils.getDateTime("2020-02-07T14:16:00.001Z"),
             2,
             "123",
-            UUID.fromString("c81d4e2e-bcf2-11e6-869b-7df92533d2db"),
+            "c81d4e2e-bcf2-11e6-869b-7df92533d2db",
             true,
             123456.toLong(),
             6000.toDouble(),
@@ -330,7 +329,7 @@ class SessionAdapterTest {
             DateUtils.getDateTime("2020-02-07T14:16:00.001Z"),
             2,
             "123",
-            UUID.fromString("c81d4e2e-bcf2-11e6-869b-7df92533d2db"),
+            "c81d4e2e-bcf2-11e6-869b-7df92533d2db",
             true,
             123456.toLong(),
             6000.toDouble(),
@@ -373,7 +372,7 @@ class SessionAdapterTest {
             DateUtils.getDateTime("2020-02-07T14:16:00.001Z"),
             2,
             "123",
-            UUID.fromString("c81d4e2e-bcf2-11e6-869b-7df92533d2db"),
+            "c81d4e2e-bcf2-11e6-869b-7df92533d2db",
             true,
             123456.toLong(),
             6000.toDouble(),
@@ -512,7 +511,7 @@ class SessionAdapterTest {
             null,
             2,
             "123",
-            UUID.fromString("c81d4e2e-bcf2-11e6-869b-7df92533d2db"),
+            "c81d4e2e-bcf2-11e6-869b-7df92533d2db",
             true,
             123456.toLong(),
             6000.toDouble(),
@@ -571,7 +570,7 @@ class SessionAdapterTest {
     @Test
     fun `missing abnormal_mechanism does not serialize `() {
         val json = "{\n" +
-            "  \"sid\": \"not a uuid\",\n" +
+            "  \"sid\": \"c81d4e2e-bcf2-11e6-869b-7df92533d2db\",\n" +
             "  \"did\": \"123\",\n" +
             "  \"init\": true,\n" +
             "  \"status\": \"ok\",\n" +
@@ -595,7 +594,7 @@ class SessionAdapterTest {
             DateUtils.getDateTime("2020-02-07T14:16:00.001Z"),
             2,
             "123",
-            null,
+            "c81d4e2e-bcf2-11e6-869b-7df92533d2db",
             true,
             123456.toLong(),
             6000.toDouble(),
diff --git a/sentry/src/test/java/io/sentry/cache/CacheStrategyTest.kt b/sentry/src/test/java/io/sentry/cache/CacheStrategyTest.kt
index 3c3e6d18d06..0c8d6210540 100644
--- a/sentry/src/test/java/io/sentry/cache/CacheStrategyTest.kt
+++ b/sentry/src/test/java/io/sentry/cache/CacheStrategyTest.kt
@@ -14,7 +14,6 @@ import java.io.ByteArrayInputStream
 import java.io.File
 import java.io.InputStreamReader
 import java.nio.file.Files
-import java.util.UUID
 import kotlin.test.AfterTest
 import kotlin.test.Test
 import kotlin.test.assertEquals
@@ -166,7 +165,7 @@ class CacheStrategyTest {
             DateUtils.getDateTime("2020-02-07T14:16:00.000Z"),
             2,
             "123",
-            UUID.fromString("c81d4e2e-bcf2-11e6-869b-7df92533d2db"),
+            "c81d4e2ebcf211e6869b7df92533d2db",
             init,
             123456.toLong(),
             6000.toDouble(),
diff --git a/sentry/src/test/java/io/sentry/cache/EnvelopeCacheTest.kt b/sentry/src/test/java/io/sentry/cache/EnvelopeCacheTest.kt
index 98751f8c448..7b4abe3f4f3 100644
--- a/sentry/src/test/java/io/sentry/cache/EnvelopeCacheTest.kt
+++ b/sentry/src/test/java/io/sentry/cache/EnvelopeCacheTest.kt
@@ -8,6 +8,7 @@ import io.sentry.SentryCrashLastRunState
 import io.sentry.SentryEnvelope
 import io.sentry.SentryEvent
 import io.sentry.SentryOptions
+import io.sentry.SentryUUID
 import io.sentry.Session
 import io.sentry.Session.State
 import io.sentry.Session.State.Ok
@@ -24,7 +25,6 @@ import java.io.File
 import java.nio.file.Files
 import java.nio.file.Path
 import java.util.Date
-import java.util.UUID
 import java.util.concurrent.TimeUnit
 import kotlin.test.BeforeTest
 import kotlin.test.Test
@@ -308,7 +308,7 @@ class EnvelopeCacheTest {
             DateUtils.getCurrentDateTime(),
             0,
             "dis",
-            UUID.randomUUID(),
+            SentryUUID.generateSentryId(),
             true,
             null,
             null,
diff --git a/sentry/src/test/java/io/sentry/protocol/SessionSerializationTest.kt b/sentry/src/test/java/io/sentry/protocol/SessionSerializationTest.kt
index f8ca3719c72..129e763331f 100644
--- a/sentry/src/test/java/io/sentry/protocol/SessionSerializationTest.kt
+++ b/sentry/src/test/java/io/sentry/protocol/SessionSerializationTest.kt
@@ -11,7 +11,6 @@ import org.junit.Test
 import org.mockito.kotlin.mock
 import java.io.StringReader
 import java.io.StringWriter
-import java.util.UUID
 import kotlin.test.assertEquals
 
 class SessionSerializationTest {
@@ -25,7 +24,7 @@ class SessionSerializationTest {
             DateUtils.getDateTime("1970-04-21T09:32:21.000Z"),
             9001,
             "631693c2-3d61-4a93-8fd1-89817426ba5a",
-            UUID.fromString("3c1ffc32-f68f-4af2-a1ee-dd72f4d62d17"),
+            "3c1ffc32-f68f-4af2-a1ee-dd72f4d62d17",
             true,
             4,
             5.5,
diff --git a/sentry/src/test/java/io/sentry/util/MapObjectReaderTest.kt b/sentry/src/test/java/io/sentry/util/MapObjectReaderTest.kt
index a335fc71f82..c27269c9dfc 100644
--- a/sentry/src/test/java/io/sentry/util/MapObjectReaderTest.kt
+++ b/sentry/src/test/java/io/sentry/util/MapObjectReaderTest.kt
@@ -13,7 +13,6 @@ import java.util.Currency
 import java.util.Date
 import java.util.Locale
 import java.util.TimeZone
-import java.util.UUID
 import kotlin.test.Test
 import kotlin.test.assertEquals
 
@@ -71,7 +70,7 @@ class MapObjectReaderTest {
         writer.name("MapOfLists").value(logger, mapOf("metric_a" to listOf("foo")))
         writer.name("Locale").value(logger, Locale.US)
         writer.name("URI").value(logger, URI.create("http://www.example.com"))
-        writer.name("UUID").value(logger, UUID.fromString("00000000-1111-2222-3333-444444444444"))
+        writer.name("UUID").value(logger, "00000000-1111-2222-3333-444444444444")
         writer.name("Currency").value(logger, Currency.getInstance("EUR"))
         writer.name("Enum").value(logger, MapObjectWriterTest.BasicEnum.A)
         writer.name("data").value(logger, mapOf("screen" to "MainActivity"))
@@ -96,8 +95,8 @@ class MapObjectReaderTest {
         assertEquals(Currency.getInstance("EUR"), Currency.getInstance(reader.nextString()))
         assertEquals("UUID", reader.nextName())
         assertEquals(
-            UUID.fromString("00000000-1111-2222-3333-444444444444"),
-            UUID.fromString(reader.nextString())
+            "00000000-1111-2222-3333-444444444444",
+            reader.nextString()
         )
         assertEquals("URI", reader.nextName())
         assertEquals(URI.create("http://www.example.com"), URI.create(reader.nextString()))
diff --git a/sentry/src/test/java/io/sentry/util/MapObjectWriterTest.kt b/sentry/src/test/java/io/sentry/util/MapObjectWriterTest.kt
index 4127a8c840f..d52ae8dbc68 100644
--- a/sentry/src/test/java/io/sentry/util/MapObjectWriterTest.kt
+++ b/sentry/src/test/java/io/sentry/util/MapObjectWriterTest.kt
@@ -12,7 +12,6 @@ import java.util.Currency
 import java.util.Date
 import java.util.Locale
 import java.util.TimeZone
-import java.util.UUID
 import java.util.concurrent.atomic.AtomicBoolean
 import java.util.concurrent.atomic.AtomicIntegerArray
 import kotlin.test.Test
@@ -61,7 +60,7 @@ class MapObjectWriterTest {
         writer.name("AtomicBoolean").value(logger, AtomicBoolean(false))
         writer.name("URI").value(logger, URI.create("http://www.example.com"))
         writer.name("InetAddress").value(logger, Inet4Address.getByName("1.1.1.1"))
-        writer.name("UUID").value(logger, UUID.fromString("00000000-1111-2222-3333-444444444444"))
+        writer.name("UUID").value(logger, "00000000-1111-2222-3333-444444444444")
         writer.name("Currency").value(logger, Currency.getInstance("EUR"))
         writer.name("Calendar").value(
             logger,