diff --git a/src/lib/pickles/pickles_intf.mli b/src/lib/pickles/pickles_intf.mli
index 91b67ea4028..2088d037da6 100644
--- a/src/lib/pickles/pickles_intf.mli
+++ b/src/lib/pickles/pickles_intf.mli
@@ -38,7 +38,7 @@ module type S = sig
     [%%versioned:
     module Stable : sig
       module V2 : sig
-        type t [@@deriving to_yojson]
+        type t [@@deriving to_yojson, of_yojson]
       end
     end]
 
diff --git a/src/lib/pickles/verification_key.ml b/src/lib/pickles/verification_key.ml
index 79fca91df0f..cee31573c0e 100644
--- a/src/lib/pickles/verification_key.ml
+++ b/src/lib/pickles/verification_key.ml
@@ -100,6 +100,11 @@ module Verifier_index_json = struct
     verifier_index_to_yojson fp
       (fun _ -> `Null)
       (polycomm_to_yojson (or_infinity_to_yojson fq))
+
+  let of_yojson fp fq =
+    verifier_index_of_yojson fp
+      (fun _ -> Ok (Backend.Tock.Keypair.load_urs ()))
+      (polycomm_of_yojson (or_infinity_of_yojson fq))
 end
 
 module Data = struct
@@ -139,10 +144,13 @@ module Stable = struct
           (Impls.Wrap.Verification_key.t
           [@to_yojson
             Verifier_index_json.to_yojson Backend.Tock.Field.to_yojson
-              Backend.Tick.Field.to_yojson] )
+              Backend.Tick.Field.to_yojson]
+          [@of_yojson
+            Verifier_index_json.of_yojson Backend.Tock.Field.of_yojson
+              Backend.Tick.Field.of_yojson] )
       ; data : Data.t
       }
-    [@@deriving fields, to_yojson]
+    [@@deriving fields, to_yojson, of_yojson]
 
     let to_latest = Fn.id
 
@@ -208,6 +216,8 @@ end]
 
 let to_yojson = Stable.Latest.to_yojson
 
+let of_yojson = Stable.Latest.of_yojson
+
 let dummy_commitments g =
   let open Plonk_types in
   { Plonk_verification_key_evals.sigma_comm =
diff --git a/src/lib/pickles/verification_key.mli b/src/lib/pickles/verification_key.mli
index b1e289df5ce..a5d8d6844f8 100644
--- a/src/lib/pickles/verification_key.mli
+++ b/src/lib/pickles/verification_key.mli
@@ -19,7 +19,7 @@ module Stable : sig
       ; index : Impls.Wrap.Verification_key.t
       ; data : Data.t
       }
-    [@@deriving fields, to_yojson, bin_shape, bin_io]
+    [@@deriving fields, to_yojson, of_yojson, bin_shape, bin_io]
 
     include Pickles_types.Sigs.VERSIONED
   end
@@ -33,7 +33,7 @@ type t = Stable.Latest.t =
   ; index : Impls.Wrap.Verification_key.t
   ; data : Data.t
   }
-[@@deriving fields, to_yojson]
+[@@deriving fields, to_yojson, of_yojson]
 
 val dummy_commitments : 'a -> 'a Pickles_types.Plonk_verification_key_evals.t