diff --git a/Cargo.toml b/Cargo.toml
index 68517b07..4536aeaf 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,21 +19,21 @@ travis-ci = { repository = "PyO3/pyo3", branch = "master" }
 appveyor = { repository = "fafhrd91/pyo3" }
 
 [dependencies]
-libc = "0.2.48"
+libc = "0.2.53"
 spin = "0.5.0"
 num-traits = "0.2.6"
 pyo3cls = { path = "pyo3cls", version = "=0.7.0-alpha.1" }
 mashup = "0.1.9"
 num-complex = { version = "0.2.1", optional = true }
 inventory = "0.1.3"
-doc-comment = "0.3"
+doc-comment = "0.3.0"
 
 [dev-dependencies]
 assert_approx_eq = "1.1.0"
-indoc = "0.3.1"
+indoc = "0.3.3"
 
 [build-dependencies]
-regex = "1.1.0"
+regex = "1.1.6"
 version_check = "0.1.5"
 
 [features]