diff --git a/.travis.yml b/.travis.yml
index 2a633ac..e2c33a3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,6 @@
 language: rust
 rust:
-    - 1.24.1
+    - 1.34.2
     - stable
     - beta
     - nightly
diff --git a/Cargo.toml b/Cargo.toml
index e5018de..cd87c01 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,7 +19,7 @@ exclude = ["tests/images/*", "tests/fuzz_images/*"]
 [dependencies]
 byteorder = "1.2"
 lzw = "0.10"
-num-derive = "0.2"
+num-derive = "0.3"
 num-traits = "0.2"
 
 [dev-dependencies]