diff --git a/.github/workflows/github-ci.yaml b/.github/workflows/github-ci.yaml
index 12cd35c86..236a0446e 100644
--- a/.github/workflows/github-ci.yaml
+++ b/.github/workflows/github-ci.yaml
@@ -91,7 +91,9 @@ jobs:
         python -c "from tests import download_test_pdfs; download_test_pdfs()"
     - name: Test with pytest
       run: |
-        python -m coverage run --parallel-mode -m pytest tests -vv
+        python -m pytest tests --cov=pypdf --cov-append -n auto -vv
+    - name: Rename coverage data file
+      run: mv .coverage ".coverage.$RANDOM"
     - name: Upload coverage data
       uses: actions/upload-artifact@v3
       with:
@@ -170,6 +172,16 @@ jobs:
         with:
           name: coverage-data
 
+      - name: Check Number of Downloaded Files
+        run: |
+          downloaded_files_count=$(find \.coverage* -type f | wc -l)
+          if [ $downloaded_files_count -eq 7 ]; then
+            echo "The expected number of files (7) were downloaded."
+          else
+            echo "ERROR: Expected 7 files, but found $downloaded_files_count files."
+            exit 1
+          fi
+
       - name: Combine coverage & create xml report
         run: |
           python -m coverage combine
diff --git a/pyproject.toml b/pyproject.toml
index 1412b5e90..6d3021745 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -51,7 +51,7 @@ crypto = [
     "PyCryptodome; python_version == '3.6'",
 ]
 image = ["Pillow>=8.0.0"]
-dev = ["black", "pip-tools", "pre-commit<2.18.0", "pytest-cov", "pytest-socket", "pytest-timeout", "flit", "wheel"]
+dev = ["black", "pip-tools", "pre-commit<2.18.0", "pytest-cov", "pytest-socket", "pytest-timeout", "flit", "wheel", "pytest-xdist"]
 docs = ["sphinx", "sphinx_rtd_theme", "myst_parser"]
 
 [tool.mutmut]
diff --git a/requirements/ci-3.11.txt b/requirements/ci-3.11.txt
index a803a5c4f..33143f5cd 100644
--- a/requirements/ci-3.11.txt
+++ b/requirements/ci-3.11.txt
@@ -6,8 +6,12 @@
 #
 attrs==23.1.0
     # via flake8-bugbear
-coverage==7.3.0
-    # via -r requirements/ci.in
+coverage[toml]==7.3.0
+    # via
+    #   -r requirements/ci.in
+    #   pytest-cov
+execnet==2.0.2
+    # via pytest-xdist
 flake8==6.1.0
     # via
     #   -r requirements/ci.in
@@ -51,14 +55,20 @@ pytest==7.4.0
     # via
     #   -r requirements/ci.in
     #   pytest-benchmark
+    #   pytest-cov
     #   pytest-socket
     #   pytest-timeout
+    #   pytest-xdist
 pytest-benchmark==4.0.0
     # via -r requirements/ci.in
+pytest-cov==4.1.0
+    # via -r requirements/ci.in
 pytest-socket==0.6.0
     # via -r requirements/ci.in
 pytest-timeout==2.1.0
     # via -r requirements/ci.in
+pytest-xdist==3.3.1
+    # via -r requirements/ci.in
 ruff==0.0.290
     # via -r requirements/ci.in
 typeguard==4.1.2
diff --git a/requirements/ci.in b/requirements/ci.in
index a84af3881..ff071d125 100644
--- a/requirements/ci.in
+++ b/requirements/ci.in
@@ -11,6 +11,8 @@ pytest
 pytest-benchmark
 pytest-socket
 pytest-timeout
+pytest-xdist
+pytest-cov
 # ruff  # only take this for 3.11
 typeguard
 types-dataclasses
diff --git a/requirements/ci.txt b/requirements/ci.txt
index ab29f9d92..0d2814426 100644
--- a/requirements/ci.txt
+++ b/requirements/ci.txt
@@ -9,8 +9,12 @@ attrs==20.3.0
     #   flake8-bugbear
     #   flake8-implicit-str-concat
     #   pytest
-coverage==6.2
-    # via -r requirements/ci.in
+coverage[toml]==6.2
+    # via
+    #   -r requirements/ci.in
+    #   pytest-cov
+execnet==1.9.0
+    # via pytest-xdist
 flake8==5.0.4
     # via
     #   -r requirements/ci.in
@@ -65,18 +69,25 @@ pytest==7.0.1
     # via
     #   -r requirements/ci.in
     #   pytest-benchmark
+    #   pytest-cov
     #   pytest-socket
     #   pytest-timeout
+    #   pytest-xdist
 pytest-benchmark==3.4.1
     # via -r requirements/ci.in
+pytest-cov==4.0.0
+    # via -r requirements/ci.in
 pytest-socket==0.4.1
     # via -r requirements/ci.in
 pytest-timeout==2.1.0
     # via -r requirements/ci.in
+pytest-xdist==3.0.2
+    # via -r requirements/ci.in
 six==1.16.0
     # via flake8-print
 tomli==1.2.3
     # via
+    #   coverage
     #   mypy
     #   pytest
 typed-ast==1.5.5
diff --git a/requirements/dev.txt b/requirements/dev.txt
index 39aca2733..edab7dd28 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -1,6 +1,6 @@
 #
-# This file is autogenerated by pip-compile with python 3.7
-# To update, run:
+# This file is autogenerated by pip-compile with Python 3.7
+# by the following command:
 #
 #    pip-compile requirements/dev.in
 #