diff --git a/setup.sh b/setup.sh
index 493297f..ad9cbd1 100755
--- a/setup.sh
+++ b/setup.sh
@@ -86,7 +86,7 @@ source tools/gen_key_materials.sh
 generate_crypto_materials N
 
 rustup install $(head -n 1 rust-toolchain)
-pip3 install --user --upgrade 'tockloader~=1.4' six intelhex
+pip3 install --user --upgrade 'tockloader==1.4' six intelhex
 rustup target add thumbv7em-none-eabi
 
 # Install dependency to create applications.