Update README.md

Installation of the psycopg package

README.md

@@ -170,15 +170,11 @@ After installing the project [dp_on_dbs](https://github.com/hmarkus/dp_on_dbs) w
   - **VertexCover**: `python construct_dpdb_visu.py [PROBLEMNUMBER] --twfile [TWFILE]`
     with the file in DIMACS tw-format containing the edges of the graph.
 
-# Installation of the psycopg2 package
+# Installation of the psycopg package 
 
-See https://www.psycopg.org/docs/install.html#build-prerequisites
+See https://www.psycopg.org/psycopg3/docs/basic/install.html
 
-For example on Linux this might need
-`sudo apt install libpq-dev`
-before completion.
-
-**Note** Whatever version of `libpq` psycopg2 is compiled with, it will be possible to connect to PostgreSQL servers of any [supported version](https://www.psycopg.org/docs/install.html#prerequisites): just install the most recent libpq version or the most practical, without trying to match it to the version of the PostgreSQL server you will have to connect to.
+**Note** Whatever version of `libpq` psycopg is compiled with, it will be possible to connect to PostgreSQL servers of any [supported version](https://www.psycopg.org/docs/install.html#prerequisites): just install the most recent libpq version or the most practical, without trying to match it to the version of the PostgreSQL server you will have to connect to.
 
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