diff --git a/src/rust/Cargo.lock b/src/rust/Cargo.lock
index ac49c8dd..c284c8a1 100644
--- a/src/rust/Cargo.lock
+++ b/src/rust/Cargo.lock
@@ -586,21 +586,23 @@ checksum = "1255076139a83bb467426e7f8d0134968a8118844faa755985e077cf31850333"
 
 [[package]]
 name = "neon"
-version = "0.4.0"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6cac4691701b686e6c07b2eb5b51a9f26f5c11179c5d7924b78100dd387fc99d"
+checksum = "075867e58280b31795f6673f0f87582a36dea2f080a51f31edd96abbdc2cfff0"
 dependencies = [
  "cslice",
  "neon-build",
  "neon-runtime",
  "semver",
+ "smallvec",
+ "winapi",
 ]
 
 [[package]]
 name = "neon-build"
-version = "0.4.0"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f9ed332afd4711b84f4f83d334428a1fd9ce53620b62b87595934297c5ede2ed"
+checksum = "6a47d5ac62595f747bf4c41b533b8af0cf7ed275745c0378e623169c07c3dc92"
 dependencies = [
  "cfg-if 0.1.10",
  "neon-sys",
@@ -608,9 +610,9 @@ dependencies = [
 
 [[package]]
 name = "neon-runtime"
-version = "0.4.0"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2beea093a60c08463f65e1da4cda68149986f60d8d2177489b44589463c782a6"
+checksum = "7717122f29d977a384ec0230d7cdd5aaf1ac4a499cca706432229d96c0a36957"
 dependencies = [
  "cfg-if 0.1.10",
  "neon-sys",
@@ -618,9 +620,9 @@ dependencies = [
 
 [[package]]
 name = "neon-sys"
-version = "0.4.0"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "69a6c1ba6b926746f4d3f596de18ce49d062d78fd9f35f636080232aa77a0e16"
+checksum = "7c2b6927be1dc3b46556c6d27b99a26fe925bae594351010564d7ea4fe2c619d"
 dependencies = [
  "cc",
  "regex",
@@ -1006,6 +1008,12 @@ version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c111b5bd5695e56cffe5129854aa230b39c93a305372fdbb2668ca2394eea9f8"
 
+[[package]]
+name = "smallvec"
+version = "1.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fbee7696b84bbf3d89a1c2eccff0850e3047ed46bfcd2e92c29a2d074d57e252"
+
 [[package]]
 name = "static_assertions"
 version = "1.1.0"
diff --git a/src/rust/Cargo.toml b/src/rust/Cargo.toml
index 771b6cb9..db5bfa6d 100644
--- a/src/rust/Cargo.toml
+++ b/src/rust/Cargo.toml
@@ -51,11 +51,11 @@ simplelog   = { version = "0.7", optional = true, default-features = false }
 rand_chacha = { version = "0.2", optional = true }
 
 # Optional, needed by the "electron" feature
-neon = { version = "0.4.1", optional = true }
+neon = { version = "0.5.1", optional = true }
 
 [build-dependencies]
 # Needed by the "electron" feature
-neon-build = "0.4.1"
+neon-build = "0.5.1"
 
 [dependencies.x25519-dalek]
 version = "0.6"