diff --git a/README.md b/README.md
index 4531da7e..63f06d7c 100644
--- a/README.md
+++ b/README.md
@@ -28,11 +28,11 @@ $ make
 $ make check
 $ sudo make install
 ```
-Download mpfr-4.1.0.tar.xz from https://www.mpfr.org.
+Download mpfr-4.2.0.tar.xz from https://www.mpfr.org.
 ```
 $ cd ~/Downloads
-$ tar xf mpfr-4.1.0.tar.xz
-$ cd mpfr-4.1.0
+$ tar xf mpfr-4.2.0.tar.xz
+$ cd mpfr-4.2.0
 $ ./configure --disable-shared
 $ make
 $ make check
@@ -40,7 +40,7 @@ $ sudo make install
 ```
 On an Intel Mac, change the `configure` command for both GMP and MPFR as follows, and ignore the `make check` command:
 ```
-CFLAGS="-arch arm64" CXXFLAGS="$CFLAGS" ./configure -host=aarch64-apple-darwin --disable-shared 
+$ CFLAGS="-arch arm64" CXXFLAGS="$CFLAGS" ./configure -host=aarch64-apple-darwin --disable-shared 
 ```
 (from https://github.com/kanjitalk755/macemu/pull/96)