diff --git a/lib/adodb/readme_moodle.txt b/lib/adodb/readme_moodle.txt
index 5c6941375b9..3d224581e61 100644
--- a/lib/adodb/readme_moodle.txt
+++ b/lib/adodb/readme_moodle.txt
@@ -1,4 +1,4 @@
-Description of ADODB V5.21 library import into Moodle
+Description of ADODB V5.20.1 library import into Moodle
 
 This library will be probably removed in Moodle 2.1,
 it is now used only in enrol and auth db plugins.
diff --git a/lib/thirdpartylibs.xml b/lib/thirdpartylibs.xml
index 89c2031337f..fc8ffe02e18 100644
--- a/lib/thirdpartylibs.xml
+++ b/lib/thirdpartylibs.xml
@@ -4,7 +4,7 @@
     <location>adodb</location>
     <name>AdoDB</name>
     <license>BSD/GPL</license>
-    <version>5.21</version>
+    <version>5.20.1</version>
     <licenseversion>2.1+</licenseversion>
   </library>
   <library>