diff --git a/contrib/scripts/install_prereq b/contrib/scripts/install_prereq
index 67a9efa04..dfa32a75d 100755
--- a/contrib/scripts/install_prereq
+++ b/contrib/scripts/install_prereq
@@ -13,7 +13,7 @@ usage() {
 }
 
 # Basic build system:
-PACKAGES_DEBIAN="subversion git build-essential automake"
+PACKAGES_DEBIAN="subversion git build-essential automake cmake"
 # Python tools
 PACKAGES_DEBIAN="$PACKAGES_DEBIAN python3 python3-pip python3-setuptools python3-dev python3-venv"
 # Testsuite: basic requirements:
@@ -22,7 +22,7 @@ PACKAGES_DEBIAN="$PACKAGES_DEBIAN liblua5.1-0-dev lua5.1 gdb"
 PACKAGES_DEBIAN="$PACKAGES_DEBIAN libpcap-dev libssl-dev libsctp-dev libncurses5-dev"
 
 # Basic build system:
-PACKAGES_RH="subversion git gcc gcc-c++ patch"
+PACKAGES_RH="subversion git gcc gcc-c++ patch cmake"
 # Python tools
 PACKAGES_RH="$PACKAGES_RH python3 python3-pip python3-setuptools python3-devel python3-virtualenv"
 # Testsuite: basic requirements:
@@ -31,7 +31,7 @@ PACKAGES_RH="$PACKAGES_RH lua-devel gdb"
 PACKAGES_RH="$PACKAGES_RH libpcap-devel openssl-devel lksctp-tools-devel"
 
 # Basic build system:
-PACKAGES_ARCH="git gcc"
+PACKAGES_ARCH="git gcc cmake"
 # Python tools
 PACKAGES_ARCH="$PACKAGES_ARCH python python-pip python-setuptools"
 # Testsuite: basic requirements:
@@ -187,9 +187,9 @@ install_sipp() {
 	$testcmd cd $PROJECT_DIR
 
 	# Checkout and build the current latest released version.
-	$testcmd git checkout v3.5.2
+	$testcmd git checkout v3.6.1
 
-	$testcmd ./build.sh --with-openssl --with-pcap --with-rtpstream --with-sctp
+	$testcmd ./build.sh --full
 	$testcmd make install
 
 	$testcmd cd $SAVE_DIR
@@ -250,7 +250,7 @@ if ! in_test_mode; then
 	echo ""
 	echo "Testsuite requires python version >= 3.6.8"
 	echo "Your installed python is"
-	python --version
+	python3 --version || python --version
 fi
 
 exit 0