diff --git a/src/main/java/org/traccar/helper/Checksum.java b/src/main/java/org/traccar/helper/Checksum.java
index b070f8006..bf2501bda 100644
--- a/src/main/java/org/traccar/helper/Checksum.java
+++ b/src/main/java/org/traccar/helper/Checksum.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012 - 2018 Anton Tananaev (anton@traccar.org)
+ * Copyright 2012 - 2026 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,13 +17,26 @@ package org.traccar.helper;
 
 import java.nio.ByteBuffer;
 import java.nio.charset.StandardCharsets;
-import java.util.zip.CRC32;
 
 public final class Checksum {
 
     private Checksum() {
     }
 
+    public static final Algorithm CRC8_EGTS = new Algorithm(8, 0x31, 0xFF, false, false, 0x00);
+    public static final Algorithm CRC8_ROHC = new Algorithm(8, 0x07, 0xFF, true, true, 0x00);
+    public static final Algorithm CRC8_DALLAS = new Algorithm(8, 0x31, 0x00, true, true, 0x00);
+
+    public static final Algorithm CRC16_IBM = new Algorithm(16, 0x8005, 0x0000, true, true, 0x0000);
+    public static final Algorithm CRC16_X25 = new Algorithm(16, 0x1021, 0xFFFF, true, true, 0xFFFF);
+    public static final Algorithm CRC16_MODBUS = new Algorithm(16, 0x8005, 0xFFFF, true, true, 0x0000);
+    public static final Algorithm CRC16_CCITT_FALSE = new Algorithm(16, 0x1021, 0xFFFF, false, false, 0x0000);
+    public static final Algorithm CRC16_KERMIT = new Algorithm(16, 0x1021, 0x0000, true, true, 0x0000);
+    public static final Algorithm CRC16_XMODEM = new Algorithm(16, 0x1021, 0x0000, false, false, 0x0000);
+
+    public static final Algorithm CRC32_STANDARD = new Algorithm(32, 0x04C11DB7, 0xFFFFFFFF, true, true, 0xFFFFFFFF);
+    public static final Algorithm CRC32_MPEG2 = new Algorithm(32, 0x04C11DB7, 0xFFFFFFFF, false, false, 0x00000000);
+
     public static class Algorithm {
 
         private final int poly;
@@ -39,7 +52,13 @@ public final class Checksum {
             this.refIn = refIn;
             this.refOut = refOut;
             this.xorOut = xorOut;
-            this.table = bits == 8 ? initTable8() : initTable16();
+            if (bits == 8) {
+                this.table = initTable8();
+            } else if (bits == 16) {
+                this.table = initTable16();
+            } else {
+                this.table = initTable32();
+            }
         }
 
         private int[] initTable8() {
@@ -76,6 +95,22 @@ public final class Checksum {
             return table;
         }
 
+        private int[] initTable32() {
+            int[] table = new int[256];
+            for (int i = 0; i < 256; i++) {
+                int crc = i << 24;
+                for (int j = 0; j < 8; j++) {
+                    if ((crc & 0x80000000) != 0) {
+                        crc = (crc << 1) ^ poly;
+                    } else {
+                        crc <<= 1;
+                    }
+                }
+                table[i] = crc;
+            }
+            return table;
+        }
+
     }
 
     private static int reverse(int value, int bits) {
@@ -117,23 +152,19 @@ public final class Checksum {
         return (crc ^ algorithm.xorOut) & 0xFFFF;
     }
 
-    public static final Algorithm CRC8_EGTS = new Algorithm(8, 0x31, 0xFF, false, false, 0x00);
-    public static final Algorithm CRC8_ROHC = new Algorithm(8, 0x07, 0xFF, true, true, 0x00);
-    public static final Algorithm CRC8_DALLAS = new Algorithm(8, 0x31, 0x00, true, true, 0x00);
-
-    public static final Algorithm CRC16_IBM = new Algorithm(16, 0x8005, 0x0000, true, true, 0x0000);
-    public static final Algorithm CRC16_X25 = new Algorithm(16, 0x1021, 0xFFFF, true, true, 0xFFFF);
-    public static final Algorithm CRC16_MODBUS = new Algorithm(16, 0x8005, 0xFFFF, true, true, 0x0000);
-    public static final Algorithm CRC16_CCITT_FALSE = new Algorithm(16, 0x1021, 0xFFFF, false, false, 0x0000);
-    public static final Algorithm CRC16_KERMIT = new Algorithm(16, 0x1021, 0x0000, true, true, 0x0000);
-    public static final Algorithm CRC16_XMODEM = new Algorithm(16, 0x1021, 0x0000, false, false, 0x0000);
-
-    public static int crc32(ByteBuffer buf) {
-        CRC32 checksum = new CRC32();
+    public static int crc32(Algorithm algorithm, ByteBuffer buf) {
+        int crc = algorithm.init;
         while (buf.hasRemaining()) {
-            checksum.update(buf.get());
+            int b = buf.get() & 0xFF;
+            if (algorithm.refIn) {
+                b = reverse(b, 8);
+            }
+            crc = (crc << 8) ^ algorithm.table[((crc >> 24) & 0xFF) ^ b];
         }
-        return (int) checksum.getValue();
+        if (algorithm.refOut) {
+            crc = reverse(crc, 32);
+        }
+        return crc ^ algorithm.xorOut;
     }
 
     public static int xor(ByteBuffer buf) {
diff --git a/src/main/java/org/traccar/protocol/ApelProtocolDecoder.java b/src/main/java/org/traccar/protocol/ApelProtocolDecoder.java
index 97ed7de96..ca7d63fd7 100644
--- a/src/main/java/org/traccar/protocol/ApelProtocolDecoder.java
+++ b/src/main/java/org/traccar/protocol/ApelProtocolDecoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2013 - 2018 Anton Tananaev (anton@traccar.org)
+ * Copyright 2013 - 2026 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -70,7 +70,7 @@ public class ApelProtocolDecoder extends BaseProtocolDecoder {
         ByteBuf request = Unpooled.buffer(8);
         request.writeShortLE(type);
         request.writeShortLE(0);
-        request.writeIntLE(Checksum.crc32(request.nioBuffer(0, 4)));
+        request.writeIntLE(Checksum.crc32(Checksum.CRC32_STANDARD, request.nioBuffer(0, 4)));
         channel.writeAndFlush(new NetworkMessage(request, channel.remoteAddress()));
     }
 
@@ -83,7 +83,7 @@ public class ApelProtocolDecoder extends BaseProtocolDecoder {
             request.writeShortLE(6);
             request.writeIntLE((int) lastIndex);
             request.writeShortLE(512);
-            request.writeIntLE(Checksum.crc32(request.nioBuffer(0, 10)));
+            request.writeIntLE(Checksum.crc32(Checksum.CRC32_STANDARD, request.nioBuffer(0, 10)));
             channel.writeAndFlush(new NetworkMessage(request, channel.remoteAddress()));
         }
     }
diff --git a/src/test/java/org/traccar/helper/ChecksumTest.java b/src/test/java/org/traccar/helper/ChecksumTest.java
index 51f62aba0..85a982280 100644
--- a/src/test/java/org/traccar/helper/ChecksumTest.java
+++ b/src/test/java/org/traccar/helper/ChecksumTest.java
@@ -31,6 +31,14 @@ public class ChecksumTest {
         assertEquals(0x31c3, Checksum.crc16(Checksum.CRC16_XMODEM, buf.nioBuffer()));
     }
 
+    @Test
+    public void testCrc32() {
+        ByteBuf buf = Unpooled.copiedBuffer("123456789", StandardCharsets.US_ASCII);
+
+        assertEquals(0xcbf43926, Checksum.crc32(Checksum.CRC32_STANDARD, buf.nioBuffer()));
+        assertEquals(0x0376e6e7, Checksum.crc32(Checksum.CRC32_MPEG2, buf.nioBuffer()));
+    }
+
     @Test
     public void testLuhn() {
         assertEquals(7, Checksum.luhn(12345678901234L));