diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index f2b5b4e..aff40bc 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -43,8 +43,13 @@ pages:
     - unzip "./fonts/*.zip" -d /usr/share/fonts/
       && fc-cache -fv
 
+    - mkdir -p /etc/fonts/conf.d &&
+      cp -a ./fonts/fonts.conf /etc/fonts/conf.d/99-firgenerd.conf &&
+      fc-cache -fv
+
     - sudo corepack enable
     - sudo -u node pnpm install
+
     - sudo -u node env LANG=ja_JP.UTF-8 pnpm run build
 
     - cp -a _book/. public/
diff --git a/book.json b/book.json
index 9815c1d..380838a 100644
--- a/book.json
+++ b/book.json
@@ -11,7 +11,6 @@
     "search-pro-fixed"
   ],
   "pdf.fontSize": 16,
-  "pdf.fontFamily": "FirgeNerd",
   "pdf.paperSize": "a4",
   "pdf.embedFonts": true
 }
diff --git a/fonts/fonts.conf b/fonts/fonts.conf
index a097e23..1cd489a 100644
--- a/fonts/fonts.conf
+++ b/fonts/fonts.conf
@@ -2,25 +2,6 @@
 <!DOCTYPE fontconfig SYSTEM 'fonts.dtd'>
 <fontconfig>
   <match target="pattern">
-    <test name="family">
-      <string>sans-serif</string>
-    </test>
-    <edit name="family" mode="assign">
-      <string>FirgeNerd</string>
-    </edit>
-  </match>
-  <match target="pattern">
-    <test name="family">
-      <string>serif</string>
-    </test>
-    <edit name="family" mode="assign">
-      <string>FirgeNerd</string>
-    </edit>
-  </match>
-  <match target="pattern">
-    <test name="family">
-      <string>monospace</string>
-    </test>
     <edit name="family" mode="assign">
       <string>FirgeNerd</string>
     </edit>