diff --git a/README.md b/README.md
index 4bb1ec7db50696937ebb766da8fdd1040fe5082d..acdebac3719e95bf97d1f63de6166643435ff74e 100644
--- a/README.md
+++ b/README.md
@@ -58,6 +58,20 @@ Install requirements:
 pip install -r requirements.txt
 ```
 
+ **NOTE:** The installation could fail with the next message if the package `libxt-dev` is not found in your OS:
+```bash
+xtloop.c:9:10: fatal error: X11/Intrinsic.h: No such file or directory
+    9 | #include <X11/Intrinsic.h>
+      |          ^~~~~~~~~~~~~~~~~
+```
+To solve that, you can install it with the following commands:
+
+- openSUSE: `sudo zypper install libXt-devel`
+- Debian / Ubuntu: `sudo apt-get install libxt-dev`
+- Fedora: `sudo dnf install libXt-devel`
+
+Then, run again: `pip install -r requirements.txt`
+
 ## Usage
 
 To run the included example, execute the following command on the installation directory (with the activated enviroment):
diff --git a/requirements.txt b/requirements.txt
index adc4d19530b6d049a00cd03544e83b98bd710941..6c51738d0e969fb5ba88dfbab173b2a65735de6a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
-pandas
-pyqt5
-matplotlib
-astropy
-requests
-Pillow
-pyds9
+pandas==2.0.1
+PyQt5==5.15.9
+matplotlib==3.7.1
+astropy==5.3
+requests==2.31.0
+Pillow==9.5.0
+pyds9==1.8.1