diff --git a/Makefile b/Makefile
index a8de591..601fd62 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 IMAGE ?= rstudio/r-system-requirements
-VARIANTS ?= focal jammy noble buster bullseye bookworm sid centos7 centos8 rockylinux8 rockylinux9 opensuse155 opensuse156 fedora39 fedora40 fedora41 alpine-3.18 alpine-3.19 alpine-3.20 alpine-3.21 alpine-edge
+VARIANTS ?= focal jammy noble bullseye bookworm sid centos7 centos8 rockylinux8 rockylinux9 opensuse156 fedora40 fedora41 alpine-3.18 alpine-3.19 alpine-3.20 alpine-3.21 alpine-edge
 
 RULES ?= rules/*.json
 
diff --git a/README.md b/README.md
index 0f25ed7..b21e7f4 100644
--- a/README.md
+++ b/README.md
@@ -50,10 +50,10 @@ The rules in this catalog support the following operating systems:
 - CentOS 7
 - Rocky Linux 8[^1], 9
 - Red Hat Enterprise Linux 7, 8, 9
-- openSUSE 15.5, 15.6
-- SUSE Linux Enterprise 15 SP5, 15 SP6
-- Debian 10, 11, 12, unstable
-- Fedora 39, 40, 41
+- openSUSE 15.6
+- SUSE Linux Enterprise 15 SP6
+- Debian 11, 12, unstable
+- Fedora 40, 41
 - Windows (for R 4.0+ only)
 
 [^1]: Rocky Linux 8 is specified as `centos8` for backward compatibility.
diff --git a/docker/buster/Dockerfile b/docker/buster/Dockerfile
deleted file mode 100644
index f600151..0000000
--- a/docker/buster/Dockerfile
+++ /dev/null
@@ -1,8 +0,0 @@
-FROM debian:10
-
-RUN apt-get update -qq && \
-    DEBIAN_FRONTEND=noninteractive apt-get install -y curl
-
-# Install jq
-RUN curl -fsSL -o /usr/local/bin/jq https://github.com/stedolan/jq/releases/download/jq-1.6/jq-linux64 && \
-    chmod +x /usr/local/bin/jq
diff --git a/docker/fedora39/Dockerfile b/docker/fedora39/Dockerfile
deleted file mode 100644
index eccb7bc..0000000
--- a/docker/fedora39/Dockerfile
+++ /dev/null
@@ -1,8 +0,0 @@
-FROM fedora:39
-
-RUN dnf upgrade -y -q && \
-    dnf install -y glibc-langpack-en
-
-# Install jq
-RUN curl -fsSL -o /usr/local/bin/jq https://github.com/stedolan/jq/releases/download/jq-1.6/jq-linux64 && \
-    chmod +x /usr/local/bin/jq
diff --git a/docker/opensuse155/Dockerfile b/docker/opensuse155/Dockerfile
deleted file mode 100644
index 2c18b91..0000000
--- a/docker/opensuse155/Dockerfile
+++ /dev/null
@@ -1,8 +0,0 @@
-FROM opensuse/leap:15.5
-
-RUN zypper --quiet --non-interactive update && \
-    zypper --non-interactive install curl
-
-# Install jq
-RUN curl -fsSL -o /usr/local/bin/jq https://github.com/stedolan/jq/releases/download/jq-1.7/jq-linux64 && \
-    chmod +x /usr/local/bin/jq
diff --git a/test/test-packages.sh b/test/test-packages.sh
index 82e5c93..24bc4e6 100755
--- a/test/test-packages.sh
+++ b/test/test-packages.sh
@@ -8,7 +8,6 @@ declare -A os_identifiers=(
     [focal]='ubuntu'
     [jammy]='ubuntu'
     [noble]='ubuntu'
-    [buster]='debian'
     [bullseye]='debian'
     [bookworm]='debian'
     [sid]='debian'
@@ -19,11 +18,8 @@ declare -A os_identifiers=(
     [rhel7]='redhat'
     [rhel8]='redhat'
     [rhel9]='redhat'
-    [opensuse155]='opensuse'
     [opensuse156]='opensuse'
-    [sle155]='sle'
     [sle156]='sle'
-    [fedora39]='fedora'
     [fedora40]='fedora'
     [fedora41]='fedora'
     [alpine-3.18]='alpine'
@@ -37,7 +33,6 @@ declare -A versions=(
     [focal]='20.04'
     [jammy]='22.04'
     [noble]='24.04'
-    [buster]='10'
     [bullseye]='11'
     [bookworm]='12'
     [sid]='unstable'
@@ -48,11 +43,8 @@ declare -A versions=(
     [rhel7]='7'
     [rhel8]='8'
     [rhel9]='9'
-    [opensuse155]='15.5'
     [opensuse156]='15.6'
-    [sle155]='15.5'
     [sle156]='15.6'
-    [fedora39]='39'
     [fedora40]='40'
     [fedora41]='41'
     [alpine-3.18]='3.18'