diff --git a/Cargo.lock b/Cargo.lock
index 7e6af3a..d910f54 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -374,6 +374,12 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "37ab347416e802de484e4d03c7316c48f1ecb56574dfd4a46a80f173ce1de04d"
 
+[[package]]
+name = "fixedbitset"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "398ea4fabe40b9b0d885340a2a991a44c8a645624075ad966d21f88688e2b69e"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -515,6 +521,15 @@ dependencies = [
  "either",
 ]
 
+[[package]]
+name = "itertools"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "69ddb889f9d0d08a67338271fa9b62996bc788c7796a5c18cf057420aaed5eaf"
+dependencies = [
+ "either",
+]
+
 [[package]]
 name = "lazy_static"
 version = "1.4.0"
@@ -682,7 +697,17 @@ version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "467d164a6de56270bd7c4d070df81d07beace25012d5103ced4e9ff08d6afdb7"
 dependencies = [
- "fixedbitset",
+ "fixedbitset 0.2.0",
+ "indexmap",
+]
+
+[[package]]
+name = "petgraph"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4a13a2fa9d0b63e5f22328828741e523766fff0ee9e779316902290dff3f824f"
+dependencies = [
+ "fixedbitset 0.4.0",
  "indexmap",
 ]
 
@@ -736,23 +761,35 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9e6984d2f1a23009bd270b8bb56d0926810a3d483f59c987d77969e9d8e840b2"
 dependencies = [
  "bytes",
- "prost-derive",
+ "prost-derive 0.7.0",
+]
+
+[[package]]
+name = "prost"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "444879275cb4fd84958b1a1d5420d15e6fcf7c235fe47f053c9c2a80aceb6001"
+dependencies = [
+ "bytes",
+ "prost-derive 0.9.0",
 ]
 
 [[package]]
 name = "prost-build"
-version = "0.7.0"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "32d3ebd75ac2679c2af3a92246639f9fcc8a442ee420719cc4fe195b98dd5fa3"
+checksum = "62941722fb675d463659e49c4f3fe1fe792ff24fe5bbaa9c08cd3b98a1c354f5"
 dependencies = [
  "bytes",
  "heck",
- "itertools",
+ "itertools 0.10.1",
+ "lazy_static",
  "log",
  "multimap",
- "petgraph",
- "prost",
+ "petgraph 0.6.0",
+ "prost 0.9.0",
  "prost-types",
+ "regex",
  "tempfile",
  "which",
 ]
@@ -764,7 +801,20 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "169a15f3008ecb5160cba7d37bcd690a7601b6d30cfb87a117d45e59d52af5d4"
 dependencies = [
  "anyhow",
- "itertools",
+ "itertools 0.9.0",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "prost-derive"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f9cc1a3263e07e0bf68e96268f37665207b49560d98739662cdfaae215c720fe"
+dependencies = [
+ "anyhow",
+ "itertools 0.10.1",
  "proc-macro2",
  "quote",
  "syn",
@@ -772,12 +822,12 @@ dependencies = [
 
 [[package]]
 name = "prost-types"
-version = "0.7.0"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b518d7cdd93dab1d1122cf07fa9a60771836c668dde9d9e2a139f957f0d9f1bb"
+checksum = "534b7a0e836e3c482d2693070f982e39e7611da9695d4d1f5a4b186b51faef0a"
 dependencies = [
  "bytes",
- "prost",
+ "prost 0.9.0",
 ]
 
 [[package]]
@@ -909,7 +959,7 @@ dependencies = [
  "hkdf",
  "mime",
  "once_cell",
- "prost",
+ "prost 0.7.0",
  "prost-build",
  "serde",
  "sha2",
@@ -1205,7 +1255,7 @@ dependencies = [
  "lazy_static",
  "nom",
  "parking_lot",
- "petgraph",
+ "petgraph 0.5.1",
 ]
 
 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index ca2ce79..536e867 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -31,7 +31,7 @@ uuid = { version = "0.8", default-features = false }
 zeroize = "1"
 
 [build-dependencies]
-prost-build = "0.7"
+prost-build = "0.9"
 
 [dev-dependencies]
 once_cell = "1"