diff --git a/mkdocs/umn-mkdocs.yml b/mkdocs/umn-mkdocs.yml
index bf72fa6..7d27b8b 100644
--- a/mkdocs/umn-mkdocs.yml
+++ b/mkdocs/umn-mkdocs.yml
@@ -41,7 +41,7 @@ jobs:
       testResultsFiles: '$(Common.TestResultsDirectory)/Test-$(Build.SourceVersion).xml'
       failTaskOnFailedTests: ${{ parameters.FailOnTestFailure }}
   - script: |
-      echo -e "FROM squidfunk/mkdocs-material \n RUN pip install mkdocs-awesome-pages-plugin mkdocs-git-revision-date-localized-plugin mkdocs-markdownextradata-plugin" | docker build -t squidfunk/mkdocs-material -
+      echo -e "FROM squidfunk/mkdocs-material \n RUN pip install mkdocs-awesome-pages-plugin mkdocs-git-revision-date-localized-plugin mkdocs-markdownextradata-plugin mkdocs-mermaid2-plugin" | docker build -t squidfunk/mkdocs-material -
       docker run --rm -v ${PWD}:/docs -v $(Build.ArtifactStagingDirectory):/docs/site squidfunk/mkdocs-material build
     displayName: mkdocs-material build
   - publish: $(Build.ArtifactStagingDirectory)