diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6924008..3cab428 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -39,7 +39,7 @@ jobs:
       - name: Pin to lowest versions
         if: matrix.versions == 'minimal'
         run: |
-          sed -i -E 's/#min //; s/\b >=([0-9])/ ==\1/' pyproject.toml
+          sed -i -E -e '/properdocs >=/d' -e 's/#min //; s/\b >=([0-9])/ ==\1/' pyproject.toml
       - name: Install Hatch
         run: |
           pip install hatch
diff --git a/mkdocs_redirects/plugin.py b/mkdocs_redirects/plugin.py
index 9500852..b4efa99 100644
--- a/mkdocs_redirects/plugin.py
+++ b/mkdocs_redirects/plugin.py
@@ -12,6 +12,15 @@
 from mkdocs.plugins import BasePlugin
 from mkdocs.structure.files import File
 
+try:
+    import properdocs.replacement_warning
+
+    # Warn when this plugin is being used from the mkdocs executable.
+    properdocs.replacement_warning.setup()
+except ImportError:
+    pass
+
+
 log = logging.getLogger("mkdocs.plugin.redirects")
 
 
diff --git a/pyproject.toml b/pyproject.toml
index f347aef..2c57da4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,7 +34,8 @@ classifiers = [
 dynamic = ["version"]
 requires-python = ">=3.10"
 dependencies = [
-    "mkdocs >=1.2",
+    "mkdocs >=1.2, <=1.6.1",
+    "properdocs >=1.6.5",
     #min "jinja2 >=2.10.2",
     #min "markupsafe >=2.0.1",
 ]