diff --git a/Cargo.toml b/Cargo.toml
index 90f427e3..bf88a447 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,7 +7,7 @@ readme = "README.md"
 keywords = ["pyo3", "python", "cpython"]
 homepage = "https://github.com/pyo3/pyo3"
 repository = "https://github.com/pyo3/pyo3.git"
-documentation = "http://pyo3.github.io/PyO3/pyo3/"
+documentation = "https://pyo3.github.io/pyo3/pyo3/"
 categories = ["api-bindings", "development-tools::ffi"]
 license = "Apache-2.0"
 exclude = [".gitignore", ".travis.yml", ".cargo/config", "appveyor.yml"]