diff --git a/README.md b/README.md
index e5b8d1072..96fd54a52 100644
--- a/README.md
+++ b/README.md
@@ -80,7 +80,7 @@ recommended) and some standard tools such as GNU Flex, GNU Bison, and GNU Make.
 TCL, readline and libffi are optional (see ``ENABLE_*`` settings in Makefile).
 Xdot (graphviz) is used by the ``show`` command in yosys to display schematics.
 
-For example on Ubuntu Linux 16.04 LTS the following commands will install all
+For example on Ubuntu Linux 22.04 LTS the following commands will install all
 prerequisites for building yosys:
 
 	$ sudo apt-get install build-essential clang lld bison flex \
diff --git a/frontends/verilog/verilog_parser.y b/frontends/verilog/verilog_parser.y
index 743061ae5..8192c0eb4 100644
--- a/frontends/verilog/verilog_parser.y
+++ b/frontends/verilog/verilog_parser.y
@@ -33,7 +33,7 @@
  *
  */
 
-%require "3.0"
+%require "3.8"
 %language "c++"
 %define api.value.type variant
 %define api.prefix {frontend_verilog_yy}