diff --git a/install_macos.sh b/install_macos.sh
index 7c48b96e..cf4b8c53 100755
--- a/install_macos.sh
+++ b/install_macos.sh
@@ -18,6 +18,9 @@ if ! [ -x "$(command -v brew)" ]; then
     /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
 fi
 
+brew update
+brew upgrade
+
 if ! [ -x "$(command -v git)" ]; then
     echo "Installing git."
     brew install git
diff --git a/install_ubuntu.sh b/install_ubuntu.sh
index 88e615af..cdf8bef7 100755
--- a/install_ubuntu.sh
+++ b/install_ubuntu.sh
@@ -13,6 +13,9 @@ $RTT_PYTHON --version 2 > /dev/null || {
     exit 1
 }
 
+sudo apt update
+sudo apt upgrade
+
 if ! [ -x "$(command -v gcc)" ]; then
     echo "Installing gcc."
     sudo apt install gcc
@@ -30,7 +33,7 @@ fi
 
 $RTT_PYTHON -m pip list > /dev/null || {
     echo "Installing pip."
-    sudo apt install python3-pip
+    sudo apt install $RTT_PYTHON-pip
 }
 
 if ! [ -x "$(command -v scons)" ]; then