diff --git a/flexBison/cplusplus/README.md b/flexBison/cplusplus/README.md
index 249000a2511d5247b8c27ec774dc2791e082157e..929f9dfe67c583b0a6baec96f5851e8f7e1e7de8 100644
--- a/flexBison/cplusplus/README.md
+++ b/flexBison/cplusplus/README.md
@@ -11,7 +11,7 @@ Changes made by Prof. Ronald Moore for his students at the h_da.
 See https://fbi.h-da.de/personen/ronald-moore/
 or mail ronald.moore@h-da.de 
 
-Last modified: 28 April 2020.
+Last modified: 23 April 2021.
 
 ## Quick Start
 
@@ -33,10 +33,10 @@ This will only work if you have flex and bison and either gcc or clang installed
 
 This version of this code was most recently tested with the following versions (no guarantee that it will work for other versions):
 
-  * bison 3.5.4
-  * flex 2.6.4
-  * clang 10.0.0
-  * gcc 9.3.0
+  * bison 3.7.6 (in 2021, and 3.5.4 in 2020)
+  * flex 2.6.4 (in 2021 and 2020)
+  * clang 11.1.0 (in 2021 and 10.0.0 in 2020)
+  * gcc 10.2.0 (in 2021 and 9.3.0 in 2020)