diff --git a/README.md b/README.md
index 8a9c3ec..0adddbf 100644
--- a/README.md
+++ b/README.md
@@ -79,7 +79,7 @@ If you use a `requirements.txt` file in your repository, then you can add
 this library with the following line:
 
 ```txt
-ipl3checksum>=1.1.0,<2.0.0
+ipl3checksum>=1.2.1,<2.0.0
 ``````
 
 Now you can invoke the library from your script.
@@ -124,7 +124,7 @@ cargo add ipl3checksum
 Or add the following line manually to your `Cargo.toml` file:
 
 ```toml
-ipl3checksum = "1.1.0"
+ipl3checksum = "1.2.1"
 ```
 
 ### C bindings