diff --git a/README.md b/README.md
index af06b20..c87a400 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 snap
 ====
 A pure Rust implementation of the
-[Snappy compression algorithm](http://google.github.io/snappy/).
+[Snappy compression algorithm](https://google.github.io/snappy/).
 Includes streaming compression and decompression using the Snappy frame format.
 This implementation is ported from both the
 [reference C++ implementation](https://github.com/google/snappy)
@@ -9,7 +9,7 @@ and the
 [Go implementation](https://github.com/golang/snappy).
 
 [![Build status](https://github.com/BurntSushi/rust-snappy/workflows/ci/badge.svg)](https://github.com/BurntSushi/rust-snappy/actions)
-[![](http://meritbadge.herokuapp.com/snap)](https://crates.io/crates/snap)
+[![](https://meritbadge.herokuapp.com/snap)](https://crates.io/crates/snap)
 
 Licensed under the BSD 3-Clause.
 
diff --git a/data/COPYING b/data/COPYING
index ae69a7b..8117699 100644
--- a/data/COPYING
+++ b/data/COPYING
@@ -14,10 +14,11 @@ Some of the benchmark data in in this directory is licensed thusly:
    “Combinatorial Modeling of Chromatin Features Quantitatively Predicts DNA
    Replication Timing in _Drosophila_” by Federico Comoglio and Renato Paro,
    which is licensed under the CC-BY license. See
-   http://www.ploscompbiol.org/static/license for more ifnormation.
+   https://journals.plos.org/ploscompbiol/s/licenses-and-copyright for more 
+   information.
 
  - alice29.txt, asyoulik.txt, plrabn12.txt and lcet10.txt are from Project
    Gutenberg. The first three have expired copyrights and are in the public
    domain; the latter does not have expired copyright, but is still in the
    public domain according to the license information
-   (http://www.gutenberg.org/ebooks/53).
+   (https://www.gutenberg.org/ebooks/53).
diff --git a/src/lib.rs b/src/lib.rs
index 06fbfed..231b047 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -10,7 +10,7 @@ decompress data at about 800 MB/sec or more.
 # Install
 
 To use this crate with
-[Cargo](http://doc.crates.io/index.html),
+[Cargo](https://doc.rust-lang.org/cargo/),
 simply add it as a dependency to your `Cargo.toml`:
 
 ```ignore
diff --git a/szip/README.md b/szip/README.md
index 6320cd7..61b299c 100644
--- a/szip/README.md
+++ b/szip/README.md
@@ -4,7 +4,7 @@ A pure Rust command line tool for compressing and decompressing Snappy files.
 By default, this tool uses the Snappy frame format.
 
 [![Build status](https://github.com/BurntSushi/rust-snappy/workflows/ci/badge.svg)](https://github.com/BurntSushi/rust-snappy/actions)
-[![](http://meritbadge.herokuapp.com/szip)](https://crates.io/crates/szip)
+[![](https://meritbadge.herokuapp.com/szip)](https://crates.io/crates/szip)
 
 Licensed under the BSD 3-Clause.