diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1d2cd54..02305bd 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -44,10 +44,8 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - distro: debian10
           - distro: debian11
           - distro: debian12
-          - distro: ubuntu1804
           - distro: ubuntu2004
           - distro: ubuntu2204
 
diff --git a/Vagrantfile b/Vagrantfile
index 5daa6bf..aef9510 100644
--- a/Vagrantfile
+++ b/Vagrantfile
@@ -4,13 +4,6 @@
 role = File.basename(File.expand_path(File.dirname(__FILE__)))
 
 boxes = [
-  {
-    :name => "ubuntu-1804",
-    :box => "bento/ubuntu-18.04",
-    :ip => '10.0.0.13',
-    :cpu => "50",
-    :ram => "384"
-  },
   {
     :name => "ubuntu-2004",
     :box => "bento/ubuntu-20.04",
@@ -25,13 +18,6 @@ boxes = [
     :cpu => "50",
     :ram => "512"
   },
-  {
-    :name => "debian-10",
-    :box => "bento/debian-10",
-    :ip => '10.0.0.18',
-    :cpu => "50",
-    :ram => "256"
-  },
   {
     :name => "debian-11",
     :box => "bento/debian-11",
diff --git a/defaults/main.yml b/defaults/main.yml
index dd58869..6021a18 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -1,5 +1,5 @@
 # defaults file
 ---
-rstudio_version: '2023.03.1-446'
+rstudio_version: '2023.12.1-402'
 rstudio_download_url: "{{ rstudio_preset_download_url }}"
 rstudio_install: []
diff --git a/meta/main.yml b/meta/main.yml
index 6878d75..6b87251 100644
--- a/meta/main.yml
+++ b/meta/main.yml
@@ -11,12 +11,10 @@ galaxy_info:
   platforms:
     - name: Ubuntu
       versions:
-        - bionic
         - focal
         - jammy
     - name: Debian
       versions:
-        - buster
         - bullseye
         - bookworm
   galaxy_tags:
diff --git a/vars/_bullseye.yml b/vars/_bullseye.yml
index a6f7b89..32a31c3 100644
--- a/vars/_bullseye.yml
+++ b/vars/_bullseye.yml
@@ -1,3 +1,3 @@
 # vars file
 ---
-rstudio_preset_download_url: "https://download1.rstudio.org/electron/bionic/{{ rstudio_machine_map[ansible_machine] }}/rstudio-{{ rstudio_version }}-{{ rstudio_machine_map[ansible_machine] }}.deb"
+rstudio_preset_download_url: "https://download1.rstudio.org/electron/focal/{{ rstudio_machine_map[ansible_machine] }}/rstudio-{{ rstudio_version }}-{{ rstudio_machine_map[ansible_machine] }}.deb"
diff --git a/vars/_buster.yml b/vars/_buster.yml
deleted file mode 100644
index a6f7b89..0000000
--- a/vars/_buster.yml
+++ /dev/null
@@ -1,3 +0,0 @@
-# vars file
----
-rstudio_preset_download_url: "https://download1.rstudio.org/electron/bionic/{{ rstudio_machine_map[ansible_machine] }}/rstudio-{{ rstudio_version }}-{{ rstudio_machine_map[ansible_machine] }}.deb"
diff --git a/vars/_focal.yml b/vars/_focal.yml
deleted file mode 100644
index a6f7b89..0000000
--- a/vars/_focal.yml
+++ /dev/null
@@ -1,3 +0,0 @@
-# vars file
----
-rstudio_preset_download_url: "https://download1.rstudio.org/electron/bionic/{{ rstudio_machine_map[ansible_machine] }}/rstudio-{{ rstudio_version }}-{{ rstudio_machine_map[ansible_machine] }}.deb"
diff --git a/vars/_stretch.yml b/vars/_stretch.yml
deleted file mode 100644
index 371f126..0000000
--- a/vars/_stretch.yml
+++ /dev/null
@@ -1,3 +0,0 @@
-# vars file
----
-rstudio_preset_download_url: "https://download1.rstudio.org/electron/debian9/{{ ansible_machine }}/rstudio-{{ rstudio_version }}-{{ rstudio_machine_map[ansible_machine] }}.deb"