diff --git a/.gitignore b/.gitignore
index 2f7896d1d1..d84cd72e17 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,3 @@
 target/
+
+Cargo.lock
diff --git a/.travis.yml b/.travis.yml
index 7f6022e91d..d3292c51c9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -38,8 +38,8 @@ matrix:
 
   include:
     - rust: stable
-    # static_assertions requires rustc 1.37.0
-    - rust: 1.37.0
+    # ptr_cast requires rustc 1.38.0
+    - rust: 1.38.0
     - rust: nightly
 
     - rust: nightly
diff --git a/Cargo.lock b/Cargo.lock
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index fff0d26e05..0000000000
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-"checksum winapi-util 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7168bab6e1daee33b4557efd0e95d5ca70a03706d39fa5f3fe7a236f584b03c9"
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-"checksum wincolor 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "561ed901ae465d6185fa7864d63fbd5720d0ef718366c9a4dc83cf6170d7e9ba"
diff --git a/libsignal-protocol-sys/libsignal-protocol-c b/libsignal-protocol-sys/libsignal-protocol-c
index 7bd0e5fee0..3a83a4f4ed 160000
--- a/libsignal-protocol-sys/libsignal-protocol-c
+++ b/libsignal-protocol-sys/libsignal-protocol-c
@@ -1 +1 @@
-Subproject commit 7bd0e5fee0ebde15c45fffcd631b74d188fd5551
+Subproject commit 3a83a4f4ed2302ff6e68ab569c88793b50c22d28
diff --git a/libsignal-protocol/Cargo.toml b/libsignal-protocol/Cargo.toml
index 3e95d771c8..6dc87840d3 100644
--- a/libsignal-protocol/Cargo.toml
+++ b/libsignal-protocol/Cargo.toml
@@ -16,7 +16,7 @@ libsignal-protocol-sys = { path = "../libsignal-protocol-sys/" }
 #libsignal-protocol-sys = "0.1.0"
 failure = "0.1.5"
 failure_derive = "0.1.5"
-rand = "0.6.5"
+rand = "0.7.3"
 log = "0.4.6"
 static_assertions = "1.1.0"
 
@@ -37,4 +37,4 @@ crypto-openssl = ["openssl", "rental"]
 
 [dev-dependencies]
 cfg-if = "0.1.9"
-env_logger = "0.6.1"
+env_logger = "0.7.1"