diff --git a/Thrive.csproj b/Thrive.csproj
index d4eb4fe7661..c3ed0f15052 100644
--- a/Thrive.csproj
+++ b/Thrive.csproj
@@ -639,7 +639,7 @@
       <Version>4.5.0</Version>
     </PackageReference>
     <PackageReference Include="SharpZipLib">
-      <Version>1.3.3</Version>
+      <Version>1.4.2</Version>
     </PackageReference>
     <PackageReference Include="Nito.Collections.Deque">
       <Version>1.1.1</Version>
diff --git a/src/saving/Save.cs b/src/saving/Save.cs
index 6de158be83c..9a1daf9aefc 100644
--- a/src/saving/Save.cs
+++ b/src/saving/Save.cs
@@ -1,8 +1,8 @@
 using System;
 using System.IO;
+using System.IO.Compression;
 using System.Text;
 using Godot;
-using ICSharpCode.SharpZipLib.GZip;
 using ICSharpCode.SharpZipLib.Tar;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
@@ -249,7 +249,7 @@ private static void WriteDataToSaveFile(string target, string justInfo, string s
         }
 
         using var fileStream = new GodotFileStream(file);
-        using Stream gzoStream = new GZipOutputStream(fileStream);
+        using Stream gzoStream = new GZipStream(fileStream, CompressionLevel.Optimal);
         using var tar = new TarOutputStream(gzoStream, Encoding.UTF8);
 
         TarHelper.OutputEntry(tar, SAVE_INFO_JSON, Encoding.UTF8.GetBytes(justInfo));
@@ -356,7 +356,7 @@ private static (string? InfoStr, string? SaveStr, byte[]? Screenshot) LoadDataFr
             throw new ArgumentException("couldn't open the file for reading");
 
         using var stream = new GodotFileStream(reader);
-        using Stream gzoStream = new GZipInputStream(stream);
+        using Stream gzoStream = new GZipStream(stream, CompressionMode.Decompress);
         using var tar = new TarInputStream(gzoStream, Encoding.UTF8);
 
         TarEntry tarEntry;
diff --git a/src/thriveopedia/fossilisation/FossilisedSpecies.cs b/src/thriveopedia/fossilisation/FossilisedSpecies.cs
index 46d945207d0..0718e37303a 100644
--- a/src/thriveopedia/fossilisation/FossilisedSpecies.cs
+++ b/src/thriveopedia/fossilisation/FossilisedSpecies.cs
@@ -1,10 +1,10 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.IO.Compression;
 using System.Linq;
 using System.Text;
 using Godot;
-using ICSharpCode.SharpZipLib.GZip;
 using ICSharpCode.SharpZipLib.Tar;
 using Newtonsoft.Json;
 using Directory = Godot.Directory;
@@ -175,7 +175,7 @@ private static void WriteDataToFossilFile(string target, string justInfo, string
         }
 
         using var fileStream = new GodotFileStream(file);
-        using Stream gzoStream = new GZipOutputStream(fileStream);
+        using Stream gzoStream = new GZipStream(fileStream, CompressionLevel.Optimal);
         using var tar = new TarOutputStream(gzoStream, Encoding.UTF8);
 
         TarHelper.OutputEntry(tar, SAVE_INFO_JSON, Encoding.UTF8.GetBytes(justInfo));
@@ -240,7 +240,7 @@ private static (string? Info, string? Fossil, byte[]? PreviewImageData) LoadData
             throw new ArgumentException("couldn't open the file for reading");
 
         using var stream = new GodotFileStream(reader);
-        using Stream gzoStream = new GZipInputStream(stream);
+        using Stream gzoStream = new GZipStream(stream, CompressionMode.Decompress);
         using var tar = new TarInputStream(gzoStream, Encoding.UTF8);
 
         TarEntry tarEntry;