[ci] Ragel subproject requires meson 0.55.0
diff --git a/.github/workflows/linux-ci.yml b/.github/workflows/linux-ci.yml
index 0d841ca..a1d08a7 100644
--- a/.github/workflows/linux-ci.yml
+++ b/.github/workflows/linux-ci.yml
@@ -14,7 +14,7 @@
     - uses: actions/checkout@v2
     - name: install dependencies
       run: sudo apt-get install pkg-config gcc gcovr gtk-doc-tools libfreetype6-dev libglib2.0-dev libcairo2-dev libicu-dev libgraphite2-dev python3 python3-setuptools ninja-build gobject-introspection libgirepository1.0-dev
-    - run: sudo pip3 install fonttools meson==0.52.0
+    - run: sudo pip3 install fonttools meson==0.55.0
     - name: run
       run: meson build -Db_coverage=true --auto-features=enabled -Dgraphite=enabled -Dchafa=disabled -Dragel_subproject=true -Doptimization=2
     - name: ci