diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5c2b91994c1dd7..79a575ab6ef8e7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,7 @@ Release channels have their own copy of this changelog:
   * SDK:
     * `cargo-build-sbf` and `cargo-build-bpf` have been deprecated for two years and have now been definitely removed.
        Use `cargo-build-sbf` and `cargo-test-sbf` instead.
+    * dependency: `curve25519-dalek` upgraded to new major version 4 (#1693). This causes breakage when mixing v2.0 and v2.1 Solana crates, so be sure to use all of one or the other. Please use only crates compatible with v2.1.
   * Stake:
     * removed the unreleased `redelegate` instruction processor and CLI commands (#2213)
   * Banks-client: