diff --git a/src/zip.rs b/src/zip.rs
index 16a1fcf..e20a45f 100644
--- a/src/zip.rs
+++ b/src/zip.rs
@@ -87,7 +87,7 @@ impl UploadedFile {
     /// through "Extra field length".
     fn shared_header_fields(&self, hash: Option<u32>) -> Vec<u8> {
         let mut fields = vec![
-            63, 0,      // Minimum version required to extract: 6.3 for UTF-8 filenames
+            45, 0,      // Minimum version required to extract: 4.5 for ZIP64
             0b00001000, // General purpose bit flag: bit 3 - size and CRC-32 in data descriptor
             0b00001000, // General purpose bit flag: bit 11 - UTF-8 filenames
             0, 0,       // Compression method: none
@@ -138,7 +138,7 @@ impl UploadedFile {
     fn central_directory_header(&self, local_header_offset: u64, hash: u32) -> Vec<u8> {
         let mut header = vec![
             0x50, 0x4b, 0x01, 0x02, // Central directory file header signature
-            63, 3,                  // Made by a Unix system supporting version 6.3
+            45, 3,                  // Made by a Unix system supporting version 4.5
         ];
         header.append(&mut self.shared_header_fields(Some(hash)));
         append_0(&mut header, 8); // Comment length, disk number, internal attributes, DOS external attributes
@@ -169,8 +169,8 @@ fn end_of_central_directory(files: &[UploadedFile]) -> Vec<u8> {
     ];
     append_0(&mut eocd, 7); // pad out the rest of the size field
     eocd.append(&mut vec![
-        63, 3, // Made by a Unix system supporting version 6.3
-        63, 0, // Minimum version 6.3 to extract
+        45, 3, // Made by a Unix system supporting version 4.5
+        45, 0, // Minimum version 4.5 to extract
     ]);
     append_0(&mut eocd, 8); // Two 4-byte disk numbers, both 0
                             // Number of central directory records, on this disk and in total