diff --git a/librustzcash-wrapper/Cargo.lock b/librustzcash-wrapper/Cargo.lock
index 7f7d85d..a77c068 100644
--- a/librustzcash-wrapper/Cargo.lock
+++ b/librustzcash-wrapper/Cargo.lock
@@ -199,7 +199,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4114279215a005bc675e386011e594e1d9b800918cea18fcadadcce864a2046b"
 dependencies = [
  "borsh-derive 0.10.3",
- "hashbrown 0.11.2",
+ "hashbrown 0.12.3",
 ]
 
 [[package]]
@@ -640,6 +640,9 @@ name = "hashbrown"
 version = "0.12.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
+dependencies = [
+ "ahash",
+]
 
 [[package]]
 name = "haskell-ffi"
@@ -1062,9 +1065,9 @@ checksum = "dc375e1527247fe1a97d8b7156678dfe7c1af2fc075c9a4db3690ecd2a148068"
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.56"
+version = "1.0.66"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2b63bdb0cd06f1f4dedf69b254734f9b45af66e4a031e42a7480257d9898b435"
+checksum = "18fb31db3f9bddb2ea821cde30a9f70117e3f119938b5ee630b7403aa6e2ead9"
 dependencies = [
  "unicode-ident",
 ]
@@ -1284,6 +1287,7 @@ dependencies = [
  "f4jumble",
  "haskell-ffi",
  "orchard",
+ "proc-macro2",
  "zcash_address",
  "zcash_client_backend",
  "zcash_note_encryption",
diff --git a/librustzcash-wrapper/Cargo.toml b/librustzcash-wrapper/Cargo.toml
index 55744d5..7496e7c 100644
--- a/librustzcash-wrapper/Cargo.toml
+++ b/librustzcash-wrapper/Cargo.toml
@@ -16,6 +16,7 @@ orchard = "0.4.0"
 zcash_note_encryption = "0.3.0"
 zcash_primitives = "0.11.0"
 zcash_client_backend = "0.9.0"
+proc-macro2 = "1.0.66"
 
 [features]
 capi = []