diff --git a/gnu/packages/crates-io.scm b/gnu/packages/crates-io.scm
index 478688e737..dfa6d03769 100644
--- a/gnu/packages/crates-io.scm
+++ b/gnu/packages/crates-io.scm
@@ -24346,6 +24346,25 @@ Pwrite traits from the scroll crate.")
     (description "Certificate transparency SCT verification library")
     (license (list license:asl2.0 license:isc license:expat))))
 
+(define-public rust-sct-0.5
+  (package
+    (inherit rust-sct-0.6)
+    (name "rust-sct")
+    (version "0.5.0")
+    (source
+      (origin
+        (method url-fetch)
+        (uri (crate-uri "sct" version))
+        (file-name
+         (string-append name "-" version ".tar.gz"))
+        (sha256
+         (base32
+          "1fb9ym5bwswx01yyggn7v2vfryih4vnqpp4r4ssv3qaqpn7xynig"))))
+    (arguments
+     `(#:cargo-inputs
+       (("rust-ring" ,rust-ring-0.14)
+        ("rust-untrusted" ,rust-untrusted-0.6))))))
+
 (define-public rust-sct-0.3
   (package/inherit rust-sct-0.6
     (name "rust-sct")