diff --git a/.github/workflows/linux_jdk11.yml b/.github/workflows/linux_jdk11.yml
index 188721aaed6..f6658ed915f 100644
--- a/.github/workflows/linux_jdk11.yml
+++ b/.github/workflows/linux_jdk11.yml
@@ -26,11 +26,13 @@ jobs:
         key: gt-maven-${{ hashFiles('**/pom.xml') }}
         restore-keys: |
           gt-maven-
-    - uses: actions/setup-python@v1
+    - uses: actions/setup-python@v2
+      with:
+        python-version: '3.x'
     - uses: BSFishy/pip-action@v1
       with:
         packages: |
-          sphinx
+          sphinx==4.5.0
           requests
     - name: Disable checksum offloading
       # See: https://github.com/actions/virtual-environments/issues/1187#issuecomment-686735760
diff --git a/.github/workflows/linux_jdk17.yml b/.github/workflows/linux_jdk17.yml
index dbf7dcf0ef8..ec85a29b3fb 100644
--- a/.github/workflows/linux_jdk17.yml
+++ b/.github/workflows/linux_jdk17.yml
@@ -26,11 +26,13 @@ jobs:
         key: gt-maven-${{ hashFiles('**/pom.xml') }}
         restore-keys: |
           gt-maven-
-    - uses: actions/setup-python@v1
+    - uses: actions/setup-python@v2
+      with:
+        python-version: '3.x'
     - uses: BSFishy/pip-action@v1
       with:
         packages: |
-          sphinx
+          sphinx==4.5.0
           requests
     - name: Disable checksum offloading
       # See: https://github.com/actions/virtual-environments/issues/1187#issuecomment-686735760
diff --git a/.github/workflows/linux_jdk8.yml b/.github/workflows/linux_jdk8.yml
index 64426fa08f1..fd320aaec28 100644
--- a/.github/workflows/linux_jdk8.yml
+++ b/.github/workflows/linux_jdk8.yml
@@ -26,11 +26,13 @@ jobs:
         key: gt-maven-${{ hashFiles('**/pom.xml') }}
         restore-keys: |
           gt-maven-
-    - uses: actions/setup-python@v1
+    - uses: actions/setup-python@v2
+      with:
+        python-version: '3.x'
     - uses: BSFishy/pip-action@v1
       with:
         packages: |
-          sphinx
+          sphinx==4.5.0
           requests
     - name: Disable checksum offloading
       # See: https://github.com/actions/virtual-environments/issues/1187#issuecomment-686735760
diff --git a/docs/common.py b/docs/common.py
index 12f6b709e0b..48785371092 100644
--- a/docs/common.py
+++ b/docs/common.py
@@ -27,13 +27,13 @@
 extensions = ['sphinx.ext.todo','sphinx.ext.extlinks']
 
 extlinks = { 
-    'wiki': ('https://github.com/geotools/geotools/wiki/%s',''),
-    'website': ('https://geotools.org/%s',''),
-    'geoserver': ('https://docs.geoserver.org/latest/en/user/%s',''),
-    'developer': ('https://docs.geotools.org/latest/developer/%s',''),
-    'user': ('https://docs.geotools.org/latest/userguide/%s',''),
-    'api': ('https://docs.geotools.org/latest/javadocs/%s',''),
-    'geot': ('https://osgeo-org.atlassian.net/browse/GEOT-%s','GEOT-')
+    'wiki': ('https://github.com/geotools/geotools/wiki/%s', None),
+    'website': ('https://geotools.org/%s', None),
+    'geoserver': ('https://docs.geoserver.org/latest/en/user/%s', None),
+    'developer': ('https://docs.geotools.org/latest/developer/%s', None),
+    'user': ('https://docs.geotools.org/latest/userguide/%s', None),
+    'api': ('https://docs.geotools.org/latest/javadocs/%s', None),
+    'geot': ('https://osgeo-org.atlassian.net/browse/GEOT-%s','GEOT-%s')
 }
 
 # Add any paths that contain templates here, relative to this directory.