diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 80fb5c58..49043bed 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,7 +17,7 @@ jobs:
       matrix:
         ruby-version: ['3.0']
         imagemagick-version:
-          - { full: 7.1.1-29, major-minor: '7.1' }
+          - { full: 7.1.1-33, major-minor: '7.1' }
     name: Lint (Ruby ${{ matrix.ruby-version }}, ImageMagick ${{ matrix.imagemagick-version.major-minor }})
     steps:
     - uses: actions/checkout@v4
@@ -53,7 +53,7 @@ jobs:
       matrix:
         ruby-version: ['3.0', '3.1', '3.2', '3.3']
         imagemagick-version:
-          - { full: 7.1.1-29, major-minor: '7.1' }
+          - { full: 7.1.1-33, major-minor: '7.1' }
     name: Ruby ${{ matrix.ruby-version }}
     steps:
     - uses: actions/checkout@v4
diff --git a/Dockerfile b/Dockerfile
index f2391c7a..d46233dd 100755
--- a/Dockerfile
+++ b/Dockerfile
@@ -14,7 +14,7 @@ ADD gruff.gemspec /tmp/gruff/gruff.gemspec
 ADD lib /tmp/gruff/lib/
 ADD before_install_linux.sh /tmp/gruff/before_install_linux.sh
 
-ENV IMAGEMAGICK_VERSION 7.1.1-29
+ENV IMAGEMAGICK_VERSION 7.1.1-33
 RUN bash /tmp/gruff/before_install_linux.sh && \
     rm -rf /var/lib/apt/lists/* && \
     gem install bundler:2.5.7 && \