diff --git a/scripts/install_astyle_dependencies_with_apt.sh b/scripts/install_astyle_dependencies_with_apt.sh
index 4aa40ff1..08533a02 100755
--- a/scripts/install_astyle_dependencies_with_apt.sh
+++ b/scripts/install_astyle_dependencies_with_apt.sh
@@ -3,4 +3,5 @@ set -eufx
 
 PACKAGES="subversion cmake"
         
-apt-get -yq --no-install-suggests --no-install-recommends install $PACKAGES
\ No newline at end of file
+apt-get update
+apt-get -yq --no-install-suggests --no-install-recommends install $PACKAGES
diff --git a/scripts/install_cppcheck_dependencies_with_apt.sh b/scripts/install_cppcheck_dependencies_with_apt.sh
index 4d91b5e9..f3f66764 100755
--- a/scripts/install_cppcheck_dependencies_with_apt.sh
+++ b/scripts/install_cppcheck_dependencies_with_apt.sh
@@ -3,4 +3,5 @@ set -eufx
 
 PACKAGES="libz3-dev z3"
         
+apt-get update
 apt-get -yq --no-install-suggests --no-install-recommends install $PACKAGES
diff --git a/scripts/install_xrdp_build_dependencies_with_apt.sh b/scripts/install_xrdp_build_dependencies_with_apt.sh
index 563d942b..3d481724 100755
--- a/scripts/install_xrdp_build_dependencies_with_apt.sh
+++ b/scripts/install_xrdp_build_dependencies_with_apt.sh
@@ -89,6 +89,7 @@ in
         ;;
 esac
 
+apt-get update
 apt-get -yq \
     --no-install-suggests \
     --no-install-recommends \