diff --git a/pkgs/by-name/sy/syncstorage-rs/package.nix b/pkgs/by-name/sy/syncstorage-rs/package.nix
index 43e6eaa62bf2..39b2b53ab03c 100644
--- a/pkgs/by-name/sy/syncstorage-rs/package.nix
+++ b/pkgs/by-name/sy/syncstorage-rs/package.nix
@@ -23,13 +23,13 @@ in
 
 rustPlatform.buildRustPackage rec {
   pname = "syncstorage-rs";
-  version = "0.21.1";
+  version = "0.21.1-unstable-2026-01-26";
 
   src = fetchFromGitHub {
     owner = "mozilla-services";
     repo = "syncstorage-rs";
-    tag = version;
-    hash = "sha256-WkUU6013sdLMh3hq9CE/D5+ftpdisihVD6W+FvjwbP4=";
+    rev = "11659d98f9c69948a0aab353437ce2036c388711";
+    hash = "sha256-G37QvxTNh/C3gmKG0UYHI6QBr0F+KLGRNI/Sx33uOsc=";
   };
 
   nativeBuildInputs = [
@@ -48,7 +48,7 @@ rustPlatform.buildRustPackage rec {
       --prefix PATH : ${lib.makeBinPath [ pyFxADeps ]}
   '';
 
-  cargoHash = "sha256-V6shIxNpw+WHqypNgE02Sr7DO8l3H9tb72a1u2UHDfo=";
+  cargoHash = "sha256-9Dcf5mDyK/XjsKTlCPXTHoBkIq+FFPDg1zfK24Y9nHQ=";
 
   # almost all tests need a DB to test against
   doCheck = false;