diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e69740c5..975b2774 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -27,7 +27,7 @@ jobs:
       - name: Install deno
         uses: denolib/setup-deno@master
         with: 
-          deno-version: 0.42.0
+          deno-version: 1.0.0
 
       - name: Check formatting
         run: deno fmt --check
diff --git a/deps.ts b/deps.ts
index 156da2bb..1d519287 100644
--- a/deps.ts
+++ b/deps.ts
@@ -1,13 +1,13 @@
 export {
   BufReader,
   BufWriter,
-} from "https://deno.land/std@v0.42.0/io/bufio.ts";
+} from "https://deno.land/std@0.51.0/io/bufio.ts";
 
-export { copyBytes } from "https://deno.land/std@v0.42.0/io/util.ts";
+export { copyBytes } from "https://deno.land/std@0.51.0/io/util.ts";
 
 export {
   Deferred,
   deferred,
-} from "https://deno.land/std@v0.42.0/util/async.ts";
+} from "https://deno.land/std@0.51.0/async/deferred.ts";
 
 export { Hash } from "https://deno.land/x/checksum@1.2.0/mod.ts";
diff --git a/packet_writer.ts b/packet_writer.ts
index 7513c156..4a3d9f2b 100644
--- a/packet_writer.ts
+++ b/packet_writer.ts
@@ -49,7 +49,7 @@ export class PacketWriter {
       // https://stackoverflow.com/questions/2269063/buffer-growth-strategy
       const newSize = oldBuffer.length + (oldBuffer.length >> 1) + size;
       this.buffer = new Uint8Array(newSize);
-      copyBytes(this.buffer, oldBuffer);
+      copyBytes(oldBuffer, this.buffer);
     }
   }
 
@@ -76,7 +76,7 @@ export class PacketWriter {
     } else {
       const encodedStr = this.encoder.encode(string);
       this._ensure(encodedStr.byteLength + 1); // +1 for null terminator
-      copyBytes(this.buffer, encodedStr, this.offset);
+      copyBytes(encodedStr, this.buffer, this.offset);
       this.offset += encodedStr.byteLength;
     }
 
@@ -90,7 +90,7 @@ export class PacketWriter {
     }
 
     this._ensure(1);
-    copyBytes(this.buffer, this.encoder.encode(c), this.offset);
+    copyBytes(this.encoder.encode(c), this.buffer, this.offset);
     this.offset++;
     return this;
   }
@@ -99,14 +99,14 @@ export class PacketWriter {
     string = string || "";
     const encodedStr = this.encoder.encode(string);
     this._ensure(encodedStr.byteLength);
-    copyBytes(this.buffer, encodedStr, this.offset);
+    copyBytes(encodedStr, this.buffer, this.offset);
     this.offset += encodedStr.byteLength;
     return this;
   }
 
   add(otherBuffer: Uint8Array) {
     this._ensure(otherBuffer.length);
-    copyBytes(this.buffer, otherBuffer, this.offset);
+    copyBytes(otherBuffer, this.buffer, this.offset);
     this.offset += otherBuffer.length;
     return this;
   }
diff --git a/test_deps.ts b/test_deps.ts
index b49533ee..1179c739 100644
--- a/test_deps.ts
+++ b/test_deps.ts
@@ -5,4 +5,4 @@ export {
   assertStrContains,
   assertThrows,
   assertThrowsAsync,
-} from "https://deno.land/std@v0.42.0/testing/asserts.ts";
+} from "https://deno.land/std@0.51.0/testing/asserts.ts";
diff --git a/utils.ts b/utils.ts
index 845917bf..baa26c3b 100644
--- a/utils.ts
+++ b/utils.ts
@@ -16,9 +16,9 @@ export function readInt32BE(buffer: Uint8Array, offset: number): number {
 
   return (
     (buffer[offset] << 24) |
-      (buffer[offset + 1] << 16) |
-      (buffer[offset + 2] << 8) |
-      buffer[offset + 3]
+    (buffer[offset + 1] << 16) |
+    (buffer[offset + 2] << 8) |
+    buffer[offset + 3]
   );
 }