diff --git a/.github/dev.yml b/.github/dev.yml
index ac626b6..e355e5d 100644
--- a/.github/dev.yml
+++ b/.github/dev.yml
@@ -2,7 +2,7 @@ pr: none
 trigger:
 - master
 
-name: 1.7.6-dev.$(Rev:r)
+name: 1.7.7-dev.$(Rev:r)
 
 pool:
   vmImage: ubuntu-latest
diff --git a/src/Session.cs b/src/Session.cs
index 9fe35fd..1a675cb 100644
--- a/src/Session.cs
+++ b/src/Session.cs
@@ -87,14 +87,13 @@ namespace WTelegram
 			encryptor.TransformBlock(utf8Json, 0, utf8Json.Length & ~15, output, 48);
 			utf8Json.AsSpan(utf8Json.Length & ~15).CopyTo(finalBlock);
 			encryptor.TransformFinalBlock(finalBlock, 0, utf8Json.Length & 15).CopyTo(output.AsMemory(48 + utf8Json.Length & ~15));
-			if (!File.Exists(_pathname))
-				File.WriteAllBytes(_pathname, output);
-			else lock (this)
-				{
-					string tempPathname = _pathname + ".tmp";
-					File.WriteAllBytes(tempPathname, output);
-					File.Replace(tempPathname, _pathname, null);
-				}
+			string tempPathname = _pathname + ".tmp";
+			lock (this)
+			{
+				File.WriteAllBytes(tempPathname, output);
+				File.Delete(_pathname);
+				File.Move(tempPathname, _pathname);
+			}
 		}
 	}
 }
\ No newline at end of file