diff --git a/CHANGELOG.md b/CHANGELOG.md
index 00ad555..b96db76 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,12 @@
 # Changelog
 
-## v1.0 (2019-11-29)
+## v1.1 (2019-11-29)
 
 * Append `/etc/resolv.conf.tail` to `/etc/resolv.conf` if it exists.
+* Use `openssl cms` in LibreSSL >3.0.2 (starting with OpenBSD 6.6-current).
+
+## v1.0 (2019-11-29)
+
 * Fixed usage.
 
 ## v0.9 (2019-06-26)
diff --git a/agent/Makefile b/agent/Makefile
index 0e2925c..c966224 100644
--- a/agent/Makefile
+++ b/agent/Makefile
@@ -9,6 +9,8 @@ MAN=		cloud-agent.8
 
 .ifdef USE_OPENSSL
 CFLAGS+=	-DUSE_OPENSSL=1
+.elifdef USE_LIBRESSL_CMS
+CFLAGS+=	-DUSE_LIBRESSL_CMS=1
 .endif
 
 CFLAGS+=	-Wall