diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index c8ca65c..3ecdfca 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -15,13 +15,16 @@
 
 permissions: {}
 
+env:
+  SPHINXOPTS: --color
+
 jobs:
   html:
     runs-on: ubuntu-latest
     outputs:
       version: ${{ steps.version.outputs.version }}
     steps:
-      - name: Checkout
+      - name: Checkout repository
         uses: actions/checkout@v3
       - name: Extract version
         id: version
@@ -41,9 +44,9 @@
           python -m pip install --upgrade pip
           pip install -r requirements.txt
       - name: Generate HTML pages
-        run: make html
-        env:
-          SPHINXOPTS: --color
+        run: |
+          export SOURCE_DATE_EPOCH="$(git log -1 --format=%ct)"
+          make html
       - name: Publish HTML pages
         uses: actions/upload-artifact@v3
         with:
@@ -54,7 +57,7 @@
   pdf:
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout
+      - name: Checkout repository
         uses: actions/checkout@v3
       - name: Set up Python
         uses: actions/setup-python@v4
@@ -68,9 +71,9 @@
           python -m pip install --upgrade pip
           pip install -r requirements.txt
       - name: Generate PDF document
-        run: make latexpdf
-        env:
-          SPHINXOPTS: --color
+        run: |
+          export SOURCE_DATE_EPOCH="$(git log -1 --format=%ct)"
+          make latexpdf
       - name: Publish PDF document
         uses: actions/upload-artifact@v3
         with: