diff --git a/pkgs/top-level/beam-packages.nix b/pkgs/top-level/beam-packages.nix
index da5fed4be4b9..85bdc59e6dbd 100644
--- a/pkgs/top-level/beam-packages.nix
+++ b/pkgs/top-level/beam-packages.nix
@@ -6,12 +6,12 @@ rec {
   # Each
   interpreters = rec {
 
-    # R19 is the default version.
-    erlang = erlangR19; # The main switch to change default Erlang version.
-    erlang_odbc = erlangR19_odbc;
-    erlang_javac = erlangR19_javac;
-    erlang_odbc_javac = erlangR19_odbc_javac;
-    erlang_nox = erlangR19_nox;
+    # R20 is the default version.
+    erlang = erlangR20; # The main switch to change default Erlang version.
+    erlang_odbc = erlangR20_odbc;
+    erlang_javac = erlangR20_javac;
+    erlang_odbc_javac = erlangR20_odbc_javac;
+    erlang_nox = erlangR20_nox;
 
     # These are standard Erlang versions, using the generic builder.
     erlangR18 = lib.callErlang ../development/interpreters/erlang/R18.nix {