diff --git a/.gitignore b/.gitignore
index a2209a6..b1fa6a7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -20,4 +20,7 @@
 /ngx_oauth2_module.la
 /nginx.conf
 /.autotools
-/.settings
\ No newline at end of file
+/.settings
+/config.guess~
+/config.sub~
+/configure~
diff --git a/ChangeLog b/ChangeLog
index 941ba29..6879a40 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+06/07/2021
+- depend on liboauth2 1.4.2.1 with fixed iat slack validation defaults
+- release 3.2.1
+
 06/03/2021
 - use ngx_pcalloc instead of ngx_pnalloc to align memory access
 
diff --git a/configure.ac b/configure.ac
index 8bcdce6..e6108ee 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-AC_INIT([ngx_oauth2_module],[3.2.0],[hans.zandbelt@zmartzone.eu])
+AC_INIT([ngx_oauth2_module],[3.2.1],[hans.zandbelt@zmartzone.eu])
 
 AM_INIT_AUTOMAKE([foreign no-define subdir-objects])
 AC_CONFIG_MACRO_DIRS([m4])
@@ -25,11 +25,11 @@ AM_CONDITIONAL(HAVE_NGINX, [test x"$have_nginx" = "xyes"])
 AC_SUBST(NGINX_CFLAGS)
 AC_SUBST(NGINX_LIBS)
 
-PKG_CHECK_MODULES(OAUTH2, [liboauth2 >= 1.4.0])
+PKG_CHECK_MODULES(OAUTH2, [liboauth2 >= 1.4.2.1])
 AC_SUBST(OAUTH2_CFLAGS)
 AC_SUBST(OAUTH2_LIBS)
 
-PKG_CHECK_MODULES(OAUTH2_NGINX, [liboauth2_nginx >= 1.4.0])
+PKG_CHECK_MODULES(OAUTH2_NGINX, [liboauth2_nginx >= 1.4.2.1])
 AC_SUBST(OAUTH2_NGINX_CFLAGS)
 AC_SUBST(OAUTH2_NGINX_LIBS)