diff --git a/Cargo.toml b/Cargo.toml
index 1340d3a..50455fd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,13 +5,15 @@ license = "MIT OR Apache-2.0"
 name = "containers-image-proxy"
 readme = "README.md"
 repository = "https://github.com/containers/containers-image-proxy-rs"
-version = "0.5.9"
+version = "0.6.0"
 rust-version = "1.70.0"
 
 [dependencies]
 anyhow = "1.0"
 fn-error-context = "0.2.0"
 futures-util = "0.3.13"
+# NOTE when bumping this in a semver-incompatible way, because we re-export it you
+# must also bump the semver of this project.
 oci-spec = "0.6.5"
 rustix = { version = "0.38", features = ["process", "net"] }
 serde = { features = ["derive"], version = "1.0.125" }
@@ -28,7 +30,3 @@ clap = { version = "4.4", features = ["derive"] }
 
 [lib]
 path = "src/imageproxy.rs"
-
-[features]
-# See https://github.com/containers/skopeo/blob/03da797e42374892bca8759668adb0b06d087876/cmd/skopeo/proxy.go#L95
-proxy_v0_2_4 = []
diff --git a/src/imageproxy.rs b/src/imageproxy.rs
index 04f8775..48e363c 100644
--- a/src/imageproxy.rs
+++ b/src/imageproxy.rs
@@ -25,9 +25,6 @@ use tracing::instrument;
 /// Re-export because we use this in our public APIs
 pub use oci_spec;
 
-pub const OCI_TYPE_LAYER_GZIP: &str = "application/vnd.oci.image.layer.v1.tar+gzip";
-pub const OCI_TYPE_LAYER_TAR: &str = "application/vnd.oci.image.layer.v1.tar";
-
 /// File descriptor range which is reserved for passing data down into the proxy;
 /// avoid configuring the command to use files in this range.  (Also, stdin is
 /// reserved)
@@ -399,7 +396,6 @@ impl ImageProxy {
     }
 
     #[instrument]
-    #[cfg(feature = "proxy_v0_2_4")]
     pub async fn open_image_optional(&self, imgref: &str) -> Result<Option<OpenedImage>> {
         tracing::debug!("opening image");
         let (imgid, _) = self