diff --git a/.github/workflows/sphinx.yml b/.github/workflows/sphinx.yml
index 67a8baf..0599f81 100644
--- a/.github/workflows/sphinx.yml
+++ b/.github/workflows/sphinx.yml
@@ -16,7 +16,7 @@ jobs:
       - name: Install and Build HTML
         run: |
           pip install --upgrade pip
-          pip install docs/requirements.txt
+          pip install -r docs/requirements.txt
           pip install ".[full]"
           sphinx-build ./docs/source ./docs/build
 
diff --git a/pymzml/version.txt b/pymzml/version.txt
index ecd7ee5..30f69e8 100644
--- a/pymzml/version.txt
+++ b/pymzml/version.txt
@@ -1 +1 @@
-2.5.8
+2.5.9