diff --git a/README.md b/README.md
index e11036f..c437e0d 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ You likely miss some of the required libraries if you get any error messages dur
 
 * `gtk+-2.0`      at least version 2.12.0
 * `gthread-2.0`   at least version 2.14.0
-* `hamlib`        at least version 4.0
+* `hamlib`        at least version 4.2
 
 Please note that you also need the so-called development packages which
 contain the necessary header files.
diff --git a/configure.ac b/configure.ac
index 890c1ef..8c0d1b3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -51,13 +51,13 @@ AM_XGETTEXT_OPTION([--from-code=UTF-8])
 AC_CHECK_LIB([m], [sincos])
 
 dnl Check hamlib
-hamlib_modules="hamlib >= 4.0"
+hamlib_modules="hamlib >= 4.2"
 PKG_CHECK_MODULES(HAMLIB, [$hamlib_modules], [
   CFLAGS="$CFLAGS $HAMLIB_CFLAGS";
   LIBS="$LIBS $HAMLIB_LIBS";
 dnl  AC_DEFINE(WANT_HAMLIB, 1)
 ], [
-  AC_MSG_ERROR([Hamradio control libraries 4.0 or later not found...])
+  AC_MSG_ERROR([Hamradio control libraries 4.2 or later not found...])
 ])