diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0f73ce453..03c083792 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,14 +11,11 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest]
-        java: [jdk11, jdk17, jdk21, jdk22, graalvm]
+        java: [jdk17, jdk21, jdk22, graalvm]
       fail-fast: false
     steps:
       - name: Check out the repository
         uses: actions/checkout@v4
-      - name: Test in Linux JDK 11
-        if: matrix.os == 'ubuntu-latest' && matrix.java == 'jdk11'
-        run: docker compose -f docker/Linux-JDK11/docker-compose.yml up --build --exit-code-from cantaloupe
       - name: Test in Linux JDK 17 (LTS)
         if: matrix.os == 'ubuntu-latest' && matrix.java == 'jdk17'
         run: docker compose -f docker/Linux-JDK17/compose.yaml up --build --exit-code-from cantaloupe
@@ -31,9 +28,6 @@ jobs:
       - name: Test in Linux GraalVM
         if: matrix.os == 'ubuntu-latest' && matrix.java == 'graalvm'
         run: docker compose -f docker/Linux-GraalVM20/compose.yaml up --build --exit-code-from cantaloupe
-      - name: Test in Windows JDK 11
-        if: matrix.os == 'windows-latest' && matrix.java == 'jdk11'
-        run: docker compose -f docker/Windows-JDK11/docker-compose.yml up --build --exit-code-from cantaloupe
       - name: Test in Windows JDK 17 (LTS)
         if: matrix.os == 'windows-latest' && matrix.java == 'jdk17'
         run: docker compose -f docker/Windows-JDK17/compose.yaml up --build --exit-code-from cantaloupe
diff --git a/docker/Linux-JDK11/Dockerfile b/docker/Linux-JDK11/Dockerfile
deleted file mode 100644
index acadf2c20..000000000
--- a/docker/Linux-JDK11/Dockerfile
+++ /dev/null
@@ -1,55 +0,0 @@
-FROM ubuntu:noble
-
-ARG DEBIAN_FRONTEND=noninteractive
-
-# Install various dependencies
-
-RUN apt-get update && apt-get install -y --no-install-recommends \
-  openjdk-11-jdk-headless \
-  ffmpeg \
-  maven \
-  wget \
-  libopenjp2-tools \
-  liblcms2-dev \
-  libpng-dev \
-  libzstd-dev \
-  libtiff-dev \
-  libjpeg-dev \
-  zlib1g-dev \
-  libwebp-dev \
-  libimage-exiftool-perl \
-  libgrokj2k1 \
-  grokj2k-tools \
-  adduser \
-  && rm -rf /var/lib/apt/lists/*
-
-# Install TurboJpegProcessor dependencies
-RUN mkdir -p /opt/libjpeg-turbo/lib
-COPY docker/image_files/libjpeg-turbo/lib64 /opt/libjpeg-turbo/lib
-
-# Install KakaduNativeProcessor dependencies
-COPY dist/deps/Linux-x86-64/lib/* /usr/lib/
-
-# Install GrokProcessor dependencies
-#RUN wget -q https://github.com/GrokImageCompression/grok/releases/download/v7.6.5/libgrokj2k1_7.6.5-1_amd64.deb \
-#    && wget -q https://github.com/GrokImageCompression/grok/releases/download/v7.6.5/grokj2k-tools_7.6.5-1_amd64.deb \
-#    && dpkg -i ./libgrokj2k1_7.6.5-1_amd64.deb \
-#    && dpkg -i --ignore-depends=libjpeg62-turbo ./grokj2k-tools_7.6.5-1_amd64.deb
-
-# A non-root user is needed for some FilesystemSourceTest tests to work.
-ARG user=cantaloupe
-ARG home=/home/$user
-RUN adduser --home $home $user
-RUN chown -R $user $home
-USER $user
-WORKDIR $home
-
-# Install application dependencies
-COPY ./pom.xml pom.xml
-RUN mvn --quiet dependency:resolve
-
-# Copy the code
-COPY --chown=cantaloupe docker/image_files/test.properties test.properties
-COPY --chown=cantaloupe ./src src
-
-ENTRYPOINT mvn --batch-mode test -Pfreedeps
diff --git a/docker/Linux-JDK11/docker-compose.yml b/docker/Linux-JDK11/docker-compose.yml
deleted file mode 100644
index 7d6a317d6..000000000
--- a/docker/Linux-JDK11/docker-compose.yml
+++ /dev/null
@@ -1,21 +0,0 @@
-#
-# N.B.: docker-compose must be invoked from the project root directory:
-#
-# docker-compose -f path/to/docker-compose.yml up --exit-code-from cantaloupe
-#
-version: '3'
-services:
-  cantaloupe:
-    build:
-      context: ../../
-      dockerfile: $PWD/docker/Linux-JDK11/Dockerfile
-  minio:
-    image: minio/minio
-    environment:
-      MINIO_ACCESS_KEY: MinioUser
-      MINIO_SECRET_KEY: OpenSesame
-    hostname: minio
-    command: server /data
-  redis:
-    image: redis:alpine
-    hostname: redis
diff --git a/docker/Windows-JDK11/Dockerfile b/docker/Windows-JDK11/Dockerfile
deleted file mode 100644
index 4dddd7d87..000000000
--- a/docker/Windows-JDK11/Dockerfile
+++ /dev/null
@@ -1,28 +0,0 @@
-FROM mcr.microsoft.com/windows/servercore:ltsc2022
-
-ENV chocolateyUseWindowsCompression false
-
-# Install the Chocolatey package manager, which makes it easier to install
-# dependencies.
-RUN powershell -Command \
-  iex ((new-object net.webclient).DownloadString('https://chocolatey.org/install.ps1')); \
-  choco feature disable --name showDownloadProgress
-
-# Install various dependencies
-# TODO: openjpeg
-RUN choco install -y ojdkbuild11 maven ffmpeg
-
-# Install TurboJpegProcessor dependencies TODO: libjpeg-turbo
-#RUN mkdir -p /opt/libjpeg-turbo/lib
-#COPY docker/image_files/libjpeg-turbo/lib64 c:\windows\system32
-
-# Install KakaduNativeProcessor dependencies
-COPY dist/deps/Windows-x86-64/lib/* c:/Windows/System32/
-
-# Install application dependencies
-COPY pom.xml pom.xml
-RUN mvn dependency:resolve
-
-# Copy the code
-COPY docker/image_files/test.properties test.properties
-COPY src src
diff --git a/docker/Windows-JDK11/Dockerfile-minio b/docker/Windows-JDK11/Dockerfile-minio
deleted file mode 100644
index 115389668..000000000
--- a/docker/Windows-JDK11/Dockerfile-minio
+++ /dev/null
@@ -1,10 +0,0 @@
-FROM mcr.microsoft.com/windows/servercore:ltsc2022
-
-ENV MINIO_ACCESS_KEY=MinioUser
-ENV MINIO_SECRET_KEY=OpenSesame
-
-RUN curl.exe --output minio.exe --url https://dl.min.io/server/minio/release/windows-amd64/minio.exe
-
-RUN mkdir c:\data
-
-CMD minio.exe server --address=:9000 c:\data
diff --git a/docker/Windows-JDK11/docker-compose.yml b/docker/Windows-JDK11/docker-compose.yml
deleted file mode 100644
index edc65a184..000000000
--- a/docker/Windows-JDK11/docker-compose.yml
+++ /dev/null
@@ -1,19 +0,0 @@
-#
-# N.B.: docker-compose must be invoked from the project root directory:
-#
-# docker-compose -f path/to/docker-compose.yml up --exit-code-from cantaloupe
-#
-version: '3'
-services:
-  cantaloupe:
-    build:
-      context: ../../
-      dockerfile: docker/Windows-JDK11/Dockerfile
-  minio:
-    build:
-      context: ../../
-      dockerfile: docker/Windows-JDK11/Dockerfile-minio
-    environment:
-      MINIO_ACCESS_KEY: MinioUser
-      MINIO_SECRET_KEY: OpenSesame
-    hostname: minio