diff --git a/src/compression.rs b/src/compression.rs
index 86358b3e..f34e2b3c 100644
--- a/src/compression.rs
+++ b/src/compression.rs
@@ -14,11 +14,19 @@ pub enum CompressionMethod {
     #[cfg(feature = "bzip2")]
     Bzip2,
     /// Unsupported compression method
+    #[deprecated(
+        since = "0.5.7",
+        note = "implementation details are being removed from the public API"
+    )]
     Unsupported(u16),
 }
 
 impl CompressionMethod {
     /// Converts an u16 to its corresponding CompressionMethod
+    #[deprecated(
+        since = "0.5.7",
+        note = "implementation details are being removed from the public API"
+    )]
     pub fn from_u16(val: u16) -> CompressionMethod {
         match val {
             0 => CompressionMethod::Stored,
@@ -26,11 +34,16 @@ impl CompressionMethod {
             8 => CompressionMethod::Deflated,
             #[cfg(feature = "bzip2")]
             12 => CompressionMethod::Bzip2,
+            #[allow(deprecated)]
             v => CompressionMethod::Unsupported(v),
         }
     }
 
     /// Converts a CompressionMethod to a u16
+    #[deprecated(
+        since = "0.5.7",
+        note = "implementation details are being removed from the public API"
+    )]
     pub fn to_u16(self) -> u16 {
         match self {
             CompressionMethod::Stored => 0,
@@ -38,6 +51,7 @@ impl CompressionMethod {
             CompressionMethod::Deflated => 8,
             #[cfg(feature = "bzip2")]
             CompressionMethod::Bzip2 => 12,
+            #[allow(deprecated)]
             CompressionMethod::Unsupported(v) => v,
         }
     }
@@ -57,7 +71,9 @@ mod test {
     #[test]
     fn from_eq_to() {
         for v in 0..(::std::u16::MAX as u32 + 1) {
+            #[allow(deprecated)]
             let from = CompressionMethod::from_u16(v as u16);
+            #[allow(deprecated)]
             let to = from.to_u16() as u32;
             assert_eq!(v, to);
         }
@@ -76,8 +92,11 @@ mod test {
     #[test]
     fn to_eq_from() {
         fn check_match(method: CompressionMethod) {
+            #[allow(deprecated)]
             let to = method.to_u16();
+            #[allow(deprecated)]
             let from = CompressionMethod::from_u16(to);
+            #[allow(deprecated)]
             let back = from.to_u16();
             assert_eq!(to, back);
         }
diff --git a/src/read.rs b/src/read.rs
index cffd0a95..ac721533 100644
--- a/src/read.rs
+++ b/src/read.rs
@@ -362,7 +362,10 @@ fn central_header_to_zip_file<R: Read + io::Seek>(
         system: System::from_u8((version_made_by >> 8) as u8),
         version_made_by: version_made_by as u8,
         encrypted,
-        compression_method: CompressionMethod::from_u16(compression_method),
+        compression_method: {
+            #[allow(deprecated)]
+            CompressionMethod::from_u16(compression_method)
+        },
         last_modified_time: DateTime::from_msdos(last_mod_date, last_mod_time),
         crc32,
         compressed_size: compressed_size as u64,
@@ -615,6 +618,7 @@ pub fn read_zipfile_from_stream<'a, R: io::Read>(
     let encrypted = flags & 1 == 1;
     let is_utf8 = flags & (1 << 11) != 0;
     let using_data_descriptor = flags & (1 << 3) != 0;
+    #[allow(deprecated)]
     let compression_method = CompressionMethod::from_u16(reader.read_u16::<LittleEndian>()?);
     let last_mod_time = reader.read_u16::<LittleEndian>()?;
     let last_mod_date = reader.read_u16::<LittleEndian>()?;
diff --git a/src/write.rs b/src/write.rs
index b3e9abac..a7ee92c7 100644
--- a/src/write.rs
+++ b/src/write.rs
@@ -408,6 +408,7 @@ impl<W: Write + io::Seek> GenericZipWriter<W> {
             CompressionMethod::Bzip2 => {
                 GenericZipWriter::Bzip2(BzEncoder::new(bare, bzip2::Compression::Default))
             }
+            #[allow(deprecated)]
             CompressionMethod::Unsupported(..) => {
                 return Err(ZipError::UnsupportedArchive("Unsupported compression"))
             }
@@ -473,6 +474,7 @@ fn write_local_file_header<T: Write>(writer: &mut T, file: &ZipFileData) -> ZipR
     };
     writer.write_u16::<LittleEndian>(flag)?;
     // Compression method
+    #[allow(deprecated)]
     writer.write_u16::<LittleEndian>(file.compression_method.to_u16())?;
     // last mod file time and last mod file date
     writer.write_u16::<LittleEndian>(file.last_modified_time.timepart())?;
@@ -524,6 +526,7 @@ fn write_central_directory_header<T: Write>(writer: &mut T, file: &ZipFileData)
     };
     writer.write_u16::<LittleEndian>(flag)?;
     // compression method
+    #[allow(deprecated)]
     writer.write_u16::<LittleEndian>(file.compression_method.to_u16())?;
     // last mod file time + date
     writer.write_u16::<LittleEndian>(file.last_modified_time.timepart())?;