diff --git a/configure.ac b/configure.ac
index 8beb2aeb28..49e7d55642 100644
--- a/configure.ac
+++ b/configure.ac
@@ -158,8 +158,8 @@ AC_CHECK_DECL([__clang__], [CLANGPP="yes"], [CLANGPP="no"])
 # USE_CLANGPP is no longer used, keep it by symmetry with USE_GXX?
 AM_CONDITIONAL(USE_CLANGPP, test "X${CLANGPP}" = "Xyes")
 
-# Check for C++11 features support
-AX_ISC_CPP11
+# Check for C++14 features support
+AX_ISC_CPP14
 
 # Check for C++20 compiler support.
 AX_ISC_CPP20
@@ -614,7 +614,7 @@ AC_COMPILE_IFELSE(
 )
 
 usable_regex=
-AC_MSG_CHECKING(for usable C++11 regex)
+AC_MSG_CHECKING(for usable C++14 regex)
 AC_RUN_IFELSE([AC_LANG_SOURCE([[
 #include <regex>
 #include <iostream>
@@ -633,7 +633,7 @@ int main() {
 # usable or not.
 # Let's be optimistic and assume it is by testing only the negative case.
 if test "x$usable_regex" != "xno" ; then
-        AC_DEFINE(USE_REGEX, 1, [Define to 1 if C++11 regex is usable])
+        AC_DEFINE(USE_REGEX, 1, [Define to 1 if C++14 regex is usable])
 fi
 
 # Check for NETCONF support. If NETCONF was enabled in the build, and this check
@@ -971,7 +971,7 @@ AC_CHECK_LIB(pthread, pthread_create,[ LDFLAGS="$LDFLAGS -lpthread" ], [])
 AX_TLS
 
 #
-# Some Googletest versions bug with C++11 compilers
+# Some Googletest versions bug with C++14 compilers
 #
 if test $enable_gtest != "no"; then
    AC_MSG_CHECKING([if Google Test is compatible with the compiler])
diff --git a/doc/sphinx/arm/install.rst b/doc/sphinx/arm/install.rst
index 63e41e6303..3ac96b6d1a 100644
--- a/doc/sphinx/arm/install.rst
+++ b/doc/sphinx/arm/install.rst
@@ -153,7 +153,7 @@ the system:
 
 -  log4cplus (at least version 1.0.3) development include headers.
 
--  A C++ compiler (with C++11 support) and standard development headers.
+-  A C++ compiler (with C++14 support) and standard development headers.
    The Kea build has been checked with GCC g++ 4.8.5 and some later versions,
    and Clang 800.0.38 and some later versions.
 
diff --git a/m4macros/ax_cpp11.m4 b/m4macros/ax_cpp14.m4
similarity index 97%
rename from m4macros/ax_cpp11.m4
rename to m4macros/ax_cpp14.m4
index 65a7044c4b..7f39a74ca3 100644
--- a/m4macros/ax_cpp11.m4
+++ b/m4macros/ax_cpp14.m4
@@ -1,13 +1,13 @@
-AC_DEFUN([AX_ISC_CPP11], [
+AC_DEFUN([AX_ISC_CPP14], [
 
 CXX_SAVED=$CXX
 feature=
-for retry in "none" "--std=c++11" "--std=c++0x" "--std=c++1x" "fail"; do
+for retry in "none" "--std=c++14" "--std=c++0x" "--std=c++1x" "fail"; do
         if test "$retry" = "fail"; then
-                AC_MSG_ERROR([$feature (a C++11 feature) is not supported])
+                AC_MSG_ERROR([$feature (a C++14 feature) is not supported])
         fi
         if test "$retry" != "none"; then
-                AC_MSG_WARN([unsupported C++11 feature])
+                AC_MSG_WARN([unsupported C++14 feature])
                 AC_MSG_NOTICE([retrying by adding $retry to $CXX])
                 CXX="$CXX_SAVED $retry"
                 AC_MSG_CHECKING($retry support)
@@ -238,4 +238,4 @@ for retry in "none" "--std=c++11" "--std=c++0x" "--std=c++1x" "fail"; do
         break
 done
 
-])dnl AX_ISC_CPP11
+])dnl AX_ISC_CPP14
diff --git a/platforms.rst b/platforms.rst
index 82465b819a..70a6bf9126 100644
--- a/platforms.rst
+++ b/platforms.rst
@@ -4,7 +4,7 @@ Supported Platforms
 ===================
 
 In general, this version of Kea builds and runs on any POSIX-compliant
-system with a C++ compiler (with C++11 support), the Botan cryptographic library,
+system with a C++ compiler (with C++14 support), the Botan cryptographic library,
 the log4cplus logging library and the Boost system library.
 
 The Kea build has been checked with GCC g++ 4.8.5 and some later versions,