diff --git a/README.md b/README.md
index a69a866b..bf1efa1c 100644
--- a/README.md
+++ b/README.md
@@ -99,6 +99,12 @@ python3 -m pip install lxml
 python3 -m pip install pyenchant
 ```
 
+PyQt/Qt should be at least 5.2.1, but ideally 5.10 or higher for nearly all features to work.
+Exporting to markdown requires PyQt/Qt 5.14.
+There are no known minimum for lxml, but the code was originally written with 4.2.
+The optional spell check library must be at least 3.0.0 to work with Windows.
+On Linux, 2.0.0 also works fine.
+
 If no external spell checking tool is installed, novelWriter will use a basic spell checker based on standard Python package `difflib`.
 Currently, only English dictionaries are available for this spell checker, but more can be added to the `nw/assets/dict` folder.
 See the [nw/assets/dict/README.md](README.md) file in that folder for how to generate more dictionaries.
diff --git a/docs/source/started.txt b/docs/source/started.txt
index 5c279e14..c27ff27e 100644
--- a/docs/source/started.txt
+++ b/docs/source/started.txt
@@ -35,6 +35,11 @@ The following are optional, but recommended:
 
 * ``pyenchant`` for spell checking
 
+PyQt/Qt should be at least 5.2.1, but ideally 5.10 or higher for nearly all features to work.
+Exporting to markdown requires PyQt/Qt 5.14.
+There are no known minimum for lxml, but the code was originally written with 4.2.
+The optional spell check library must be at least 3.0.0 to work with Windows.
+On Linux, 2.0.0 also works fine.
 
 Running novelWriter
 ===================
diff --git a/requirements.txt b/requirements.txt
index 08fc42c3..c50e7b68 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
-pyqt5
-lxml
-pyenchant
+pyqt5>=5.2.1
+lxml>=4.2.0
+pyenchant>=3.0.0
diff --git a/setup.py b/setup.py
index f9736fee..9a59bccf 100755
--- a/setup.py
+++ b/setup.py
@@ -37,8 +37,8 @@ setuptools.setup(
     ],
     python_requires = ">=3.6",
     install_requires = [
-        "pyqt5",
-        "lxml",
-        "pyenchant",
+        "pyqt5>=5.2.1",
+        "lxml>=4.2.0",
+        "pyenchant>=3.0.0",
     ],
 )