diff --git a/.github/workflows/test-on-rpi.yml b/.github/workflows/test-on-rpi.yml
index 38f6c18..250b0d2 100644
--- a/.github/workflows/test-on-rpi.yml
+++ b/.github/workflows/test-on-rpi.yml
@@ -44,7 +44,7 @@ jobs:
             sudo apt-get update -y
             python --version
             sudo apt-get install -y python3-pip
-            sudo apt-get install zlib1g libjpeg-dev libatlas-base-dev rustc libopenjp2-7 python3-dev scons libssl-dev python3-venv python3-pip git libfreetype6-dev wkhtmltopdf -y
+            sudo apt-get install zlib1g libjpeg-dev libatlas-base-dev rustc libopenjp2-7 python3-dev scons libssl-dev python3-venv python3-pip git libfreetype6-dev wkhtmltopdf libopenblas-dev -y
             echo $PWD && ls
             git clone --branch main --single-branch https://github.com/aceinnolab/Inkycal
             cd Inkycal
diff --git a/.github/workflows/update-os.yml b/.github/workflows/update-os.yml
index 7c775a9..b469f28 100644
--- a/.github/workflows/update-os.yml
+++ b/.github/workflows/update-os.yml
@@ -37,7 +37,7 @@ jobs:
             sudo apt-get update -y
             python --version
             sudo apt-get install -y python3-pip
-            sudo apt-get install zlib1g libjpeg-dev libatlas-base-dev rustc libopenjp2-7 python3-dev scons libssl-dev python3-venv python3-pip git libfreetype6-dev wkhtmltopdf -y
+            sudo apt-get install zlib1g libjpeg-dev libatlas-base-dev rustc libopenjp2-7 python3-dev scons libssl-dev python3-venv python3-pip git libfreetype6-dev wkhtmltopdf libopenblas-dev -y
             echo $PWD && ls
             git clone https://github.com/aceinnolab/Inkycal
             cd Inkycal
diff --git a/README.md b/README.md
index 7335eb7..77bd5eb 100644
--- a/README.md
+++ b/README.md
@@ -165,7 +165,7 @@ Run the following steps to install Inkycal. Do **not** use sudo for this, except
 
 ```bash
 # the next line is for the Raspberry Pi only
-sudo apt-get install zlib1g libjpeg-dev libatlas-base-dev rustc libopenjp2-7 python3-dev scons libssl-dev python3-venv python3-pip git libfreetype6-dev wkhtmltopdf
+sudo apt-get install zlib1g libjpeg-dev libatlas-base-dev rustc libopenjp2-7 python3-dev scons libssl-dev python3-venv python3-pip git libfreetype6-dev wkhtmltopdf libopenblas-dev
 cd $HOME
 git clone --branch main --single-branch https://github.com/aceinnolab/Inkycal
 cd Inkycal