diff --git a/.gitignore b/.gitignore
index fcb8af5..0b8e1f7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 /libz-sys-1.0.18.crate
+/libz-sys-1.0.20.crate
diff --git a/sources b/sources
index 12f7e30..358bb7f 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (libz-sys-1.0.18.crate) = fcc9e5bd9ffd5eb4f302d3c271f86370f04fe9fcb3b818ac8d605241a701e9d0c40cfe729ad8fcbe7bbb07df66539503415a00360c56831a511142ff225d0d8c
+SHA512 (libz-sys-1.0.20.crate) = bbc5424edaf7f3c994e4f1b72f58be8c21a09d1e9f7b88b29d0c4fca76c70193fa0a8ab75e2591062bb6094dbfb9d422832860b01e78573cff10c672d9594fae