diff --git a/.travis.yml b/.travis.yml
index b92f7e7..0d02084 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,8 @@
 language: rust
-cache: cargo # https://docs.travis-ci.com/user/caching/#Rust-Cargo-cache
+cache:
+  directories:
+    - $HOME/.cargo
+    - $TRAVIS_BUILD_DIR/target
 
 rust:
   - stable
@@ -20,7 +23,7 @@ matrix:
       before_script:
         - rustup component add rustfmt-preview
       script:
-        - cargo fmt --all -- --write-mode=diff
+        - cargo fmt --all -- --check
     - env: NAME='kcov'
       sudo: required # travis-ci/travis-ci#9061
       before_script:
@@ -48,3 +51,8 @@ script:
   - cargo build --verbose --all-features
   - cargo test --verbose --all-features
   - cargo doc --verbose --all-features
+
+before_install:
+  - export PATH=$PATH:$HOME/protobuf/bin
+  - export PROTOC_VERSION=$(cat PROTOC_VERSION)
+  - bash install_protobuf.sh
diff --git a/Cargo.lock b/Cargo.lock
index 7e0d4e8..c504368 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,3 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
 [[package]]
 name = "aho-corasick"
 version = "0.5.3"
@@ -7,11 +9,24 @@ dependencies = [
 ]
 
 [[package]]
-name = "arrayvec"
-version = "0.4.7"
+name = "backtrace"
+version = "0.3.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "nodrop 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace-sys 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-demangle 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "backtrace-sys"
+version = "0.1.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cc 1.0.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -29,50 +44,32 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
-name = "byteorder"
-version = "1.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "cc"
-version = "1.0.9"
+name = "bumpalo"
+version = "2.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
-name = "cfg-if"
-version = "0.1.2"
+name = "byteorder"
+version = "1.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
-name = "crossbeam-deque"
-version = "0.2.0"
+name = "c2-chacha"
+version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "crossbeam-epoch 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-utils 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ppv-lite86 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "crossbeam-epoch"
-version = "0.3.1"
+name = "cc"
+version = "1.0.50"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "arrayvec 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-utils 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "memoffset 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "nodrop 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
 [[package]]
-name = "crossbeam-utils"
-version = "0.2.2"
+name = "cfg-if"
+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
 [[package]]
 name = "either"
@@ -93,12 +90,32 @@ name = "error-chain"
 version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "failure"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "backtrace 0.3.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure_derive 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "failure_derive"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "synstructure 0.12.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "flate2"
 version = "0.2.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
  "miniz-sys 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -117,9 +134,22 @@ version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
-name = "gcc"
-version = "0.3.54"
+name = "getrandom"
+version = "0.1.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasi 0.9.0+wasi-snapshot-preview1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "heck"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "unicode-segmentation 1.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
 name = "itertools"
@@ -129,6 +159,14 @@ dependencies = [
  "either 1.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "js-sys"
+version = "0.3.25"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "wasm-bindgen 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "kernel32-sys"
 version = "0.2.2"
@@ -140,26 +178,20 @@ dependencies = [
 
 [[package]]
 name = "lamport_sigs"
-version = "0.5.0"
+version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
- "ring 0.12.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ring 0.16.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "lazy_static"
-version = "0.2.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "lazy_static"
-version = "1.0.0"
+version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "libc"
-version = "0.2.40"
+version = "0.2.66"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -183,31 +215,32 @@ name = "memchr"
 version = "0.1.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "memoffset"
-version = "0.2.1"
+name = "memchr"
+version = "2.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "merkle"
-version = "1.5.0"
+version = "1.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "protobuf 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "ring 0.12.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "protobuf 2.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "protoc-rust 2.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ring 0.16.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "merkle_sigs"
-version = "1.4.0"
+version = "1.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lamport_sigs 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "merkle 1.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "ring 0.12.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lamport_sigs 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "merkle 1.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ring 0.16.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -215,21 +248,38 @@ name = "miniz-sys"
 version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "nodrop"
-version = "0.1.12"
+name = "nom"
+version = "4.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "memchr 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
-name = "num_cpus"
-version = "1.8.0"
+name = "ppv-lite86"
+version = "0.2.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "proc-macro2"
+version = "0.4.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -237,6 +287,38 @@ name = "protobuf"
 version = "1.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "protobuf"
+version = "2.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "protobuf-codegen"
+version = "2.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "protobuf 2.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "protoc"
+version = "2.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "protoc-rust"
+version = "2.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "protobuf 2.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "protobuf-codegen 2.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "protoc 2.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tempfile 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "quickcheck"
 version = "0.4.1"
@@ -247,13 +329,29 @@ dependencies = [
  "rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "quote"
+version = "0.6.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rand"
 version = "0.3.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -263,30 +361,52 @@ version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "rayon"
-version = "0.8.2"
+name = "rand"
+version = "0.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "rayon-core 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "getrandom 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_chacha 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_hc 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "rayon-core"
-version = "1.4.0"
+name = "rand_chacha"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "crossbeam-deque 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)",
- "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "c2-chacha 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "getrandom 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rand_hc"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "redox_syscall"
+version = "0.1.56"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "regex"
 version = "0.1.80"
@@ -304,18 +424,33 @@ name = "regex-syntax"
 version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "remove_dir_all"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "ring"
-version = "0.12.1"
+version = "0.16.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "gcc 0.3.54 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)",
- "rayon 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "untrusted 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "spin 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "untrusted 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "web-sys 0.3.25 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rustc-demangle"
+version = "0.1.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "rusty_secrets"
 version = "0.2.3-pre"
@@ -324,11 +459,11 @@ dependencies = [
  "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "flate2 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
  "itertools 0.7.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "merkle_sigs 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "merkle_sigs 1.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "protobuf 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "quickcheck 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "ring 0.12.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ring 0.16.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -337,17 +472,66 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
-name = "scopeguard"
-version = "0.3.3"
+name = "sourcefile"
+version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "spin"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "syn"
+version = "0.15.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "synstructure"
+version = "0.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
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diff --git a/Cargo.toml b/Cargo.toml
index 6b5581b..efdee41 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,8 +27,8 @@ dss = []
 [dependencies]
 base64 = "0.9.0"
 rand = "^0.4.2"
-ring = "^0.12"
-merkle_sigs = "^1.4"
+ring = "^0.16"
+merkle_sigs = "^1.7"
 protobuf = ">= 1.4, < 1.6"
 
 [dependencies.error-chain]
diff --git a/PROTOC_VERSION b/PROTOC_VERSION
new file mode 100644
index 0000000..a76ccff
--- /dev/null
+++ b/PROTOC_VERSION
@@ -0,0 +1 @@
+3.7.1
diff --git a/install_protobuf.sh b/install_protobuf.sh
new file mode 100755
index 0000000..218fdf3
--- /dev/null
+++ b/install_protobuf.sh
@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+set -e
+set -x
+
+PROTOC_VERSION=$(cat PROTOC_VERSION)
+
+check_protoc_version () {
+    this_version=`protoc --version`
+    return `[ "libprotoc $PROTOC_VERSION" = "$this_version" ]`
+}
+
+if check_protoc_version; then
+    echo $PROTOC_VERSION detected.
+    exit
+fi
+
+PROTOC_FILENAME=protoc-${PROTOC_VERSION}-linux-x86_64.zip
+mkdir -p $HOME/protobuf
+pushd $HOME/protobuf
+wget https://github.com/google/protobuf/releases/download/v${PROTOC_VERSION}/${PROTOC_FILENAME}
+unzip -o ${PROTOC_FILENAME}
+bin/protoc --version
+popd
diff --git a/rust-toolchain b/rust-toolchain
index f9e8384..7d47e59 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-1.24.1
+1.41.0
diff --git a/src/lagrange.rs b/src/lagrange.rs
index b49a91f..c45b21c 100644
--- a/src/lagrange.rs
+++ b/src/lagrange.rs
@@ -27,7 +27,8 @@ fn barycentric_interpolate_at(k: usize, points: &[(u8, u8)]) -> u8 {
             let delta = x[j] - x[i];
             assert_ne!(delta.poly, 0, "Duplicate shares");
             w[j] /= delta;
-            w[i] -= w[j];
+            let wj = w[j];
+            w[i] -= wj;
         }
     }