diff --git a/.circleci/config.yml b/.circleci/config.yml
index 4e8695e8..7c6f1b33 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -82,6 +82,9 @@ libressl_250: &LIBRESSL_250
 libressl_261: &LIBRESSL_262
   LIBRARY: libressl
   VERSION: 2.6.2
+libressl_263: &LIBRESSL_263
+  LIBRARY: libressl
+  VERSION: 2.6.3
 
 x86_64: &X86_64
   TARGET: x86_64-unknown-linux-gnu
@@ -144,6 +147,10 @@ jobs:
     <<: *JOB
     environment:
       <<: [*LIBRESSL_262, *X86_64, *BASE]
+  x86_64-libressl-2.6.3:
+    <<: *JOB
+    environment:
+      <<: [*LIBRESSL_263, *X86_64, *BASE]
 workflows:
   version: 2
   tests:
@@ -159,3 +166,4 @@ workflows:
     - armhf-openssl-1.0.1
     - x86_64-libressl-2.5.0
     - x86_64-libressl-2.6.2
+    - x86_64-libressl-2.6.3