diff --git a/hugo/content/posts/2021-10-19-crates.md b/hugo/content/posts/2021-10-19-crates.md
index 2018cfa..8258962 100644
--- a/hugo/content/posts/2021-10-19-crates.md
+++ b/hugo/content/posts/2021-10-19-crates.md
@@ -9,7 +9,7 @@ title: Crates (existentials in F#)
 summary: "An introduction to the crate pattern for representing existential quantification in F#."
 ---
 
-The usual blog post introducing crates in F# is [G-Research's](https://www.gresearch.co.uk/article/squeezing-more-out-of-the-f-type-system-introducing-crates/).
+The usual blog post introducing crates in F# is [G-Research's](https://web.archive.org/web/20220421204450/https://www.gresearch.co.uk/blog/article/squeezing-more-out-of-the-f-type-system-introducing-crates/).
 However, I believe that post approaches things from a much more abstract perspective than is useful.
 Instead, I will approach them by starting from the concrete.