diff --git a/.github/workflows/redmine_plugin.yml b/.github/workflows/redmine_plugin.yml
index a7ae690..ac9ea98 100644
--- a/.github/workflows/redmine_plugin.yml
+++ b/.github/workflows/redmine_plugin.yml
@@ -22,9 +22,6 @@ jobs:
         - '3.0 redmine/redmine@5.0.9'
         - '2.7 redmine/redmine@4.2.11'
         - '2.6 redmine/redmine@4.2.11'
-        - '2.6 redmine/redmine@4.1.7'
-        - '2.6 redmine/redmine@4.0.9'
-        - '2.5 redmine/redmine@4.0.9'
         experimental: [false]
         include:
           - mat_env: '3.3 redmica/redmica@master'
@@ -73,13 +70,6 @@ jobs:
         restore-keys: |
           ${{ runner.os }}-gems-
 
-    - name: uninitialized constant Nokogiri::HTML4 Issue HACK ref. https://qiita.com/Mattani/items/c4bcc95a72b69d1c0489
-      uses: DamianReeves/write-file-action@v1.2
-      with:
-        path: ./redmine/Gemfile.local
-        contents: |
-          gem 'loofah', '~> 2.20.0'
-      if: contains(fromJSON('["2.6 redmine/redmine@4.1.7", "2.6 redmine/redmine@4.0.9", "2.5 redmine/redmine@4.0.9"]'), matrix.mat_env)
     - name: "'LoadError: cannot load such file -- blankslate' Issue HACK ref. https://www.redmine.org/issues/40802#note-11"
       uses: DamianReeves/write-file-action@v1.2
       with: