diff --git a/Cargo.toml b/Cargo.toml
index ed02b12..f9bf94f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,8 +11,8 @@ keywords = ["magickwand", "imagemagick"]
 build = "build.rs"
 
 [dependencies]
-libc = ">=0.2"
+libc = "0.2.70"
 
 [build-dependencies]
-bindgen = "0.52.0"
-pkg-config = ">=0.3"
+bindgen = "0.53.2"
+pkg-config = "0.3.17"
diff --git a/build.rs b/build.rs
index 76ca580..65115f3 100644
--- a/build.rs
+++ b/build.rs
@@ -132,6 +132,7 @@ fn main() {
             .ctypes_prefix("libc")
             .raw_line("extern crate libc;")
             .header(gen_h_path.to_str().unwrap())
+            .size_t_is_usize(true)
             .parse_callbacks(Box::new(ignored_macros))
             .blacklist_type("timex")
             .blacklist_function("clock_adjtime");