diff --git a/Cargo.toml b/Cargo.toml
index fe5a5c4b..c0a08d93 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,7 +6,7 @@ authors = ["Patrick Marks <patrick@10xgenomics.com>"]
 [dependencies]
 libc = "*"
 log = "*"
-fern = "*"
+fern = "0.3.5"
 chrono = ">=0.3.0"
 rustc-serialize = "*"
 backtrace = "*"