diff --git a/Dockerfile b/Dockerfile
index db8baa1..b3b25f6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -30,7 +30,7 @@ RUN echo '%sudo ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
 USER rustle
 WORKDIR /home/rustle
 
-RUN curl --proto '=https' --tlsv1.2 https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain stable
+RUN curl --proto '=https' --tlsv1.2 https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain 1.64.0
 # RUN echo 'source /home/rustle/.cargo/env' >> /home/rustle/.bashrc
 
 ENV PATH="/home/rustle/.cargo/bin:/home/rustle/.local/bin:$PATH"
diff --git a/README.md b/README.md
index 34a4aa6..37d2613 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,7 @@ Install the required toolkits with the following commands for **Rustle**. Comman
 ```bash
 # install Rust Toolchain
 curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+rustup default 1.64.0  # we are still working on supporting v1.65.0
 
 # install LLVM 15
 sudo bash -c "$(wget -O - https://apt.llvm.org/llvm.sh)" 15