diff --git a/ci/dictionary.txt b/ci/dictionary.txt
index f2b9c50668..fa7d0a0f0b 100644
--- a/ci/dictionary.txt
+++ b/ci/dictionary.txt
@@ -198,6 +198,7 @@ Hoare
 Hola
 homogenous
 html
+https
 hyperoptimize
 hypotheticals
 Iceburgh
@@ -357,6 +358,7 @@ PrimaryColor
 println
 priv
 proc
+proto
 pthreads
 pushups
 QuitMessage
@@ -476,6 +478,7 @@ timestamp
 Tiếng
 timeline
 tlborm
+tlsv
 TODO
 TokenStream
 toml
diff --git a/src/ch01-01-installation.md b/src/ch01-01-installation.md
index d7659ebab8..33fe7397c4 100644
--- a/src/ch01-01-installation.md
+++ b/src/ch01-01-installation.md
@@ -28,7 +28,7 @@ using these steps should work as expected with the content of this book.
 If you’re using Linux or macOS, open a terminal and enter the following command:
 
 ```text
-$ curl https://sh.rustup.rs -sSf | sh
+$ curl --proto '=https' --tlsv1.2 https://sh.rustup.rs -sSf | sh
 ```
 
 The command downloads a script and starts the installation of the `rustup`