diff --git a/.circleci/config.yml b/.circleci/config.yml
index c56d737..920e9ff 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1,23 +1,22 @@
-version: 2
+version: 2.1
 
 jobs:
   gcc:
     docker:
-      - image: outpostuniverse/op2utility:1.2
+      - image: outpostuniverse/op2utility:1.5
     steps:
       - checkout
       - run: git submodule update --init || true
       - run: make --keep-going --jobs=2 config=gcc
   clang:
     docker:
-      - image: outpostuniverse/op2utility:1.2
+      - image: outpostuniverse/op2utility:1.5
     steps:
       - checkout
       - run: git submodule update --init || true
       - run: make --keep-going --jobs=2 config=clang
 
 workflows:
-  version: 2
   build:
     jobs:
       - gcc
diff --git a/OP2Utility b/OP2Utility
index 8584f06..7be4bbd 160000
--- a/OP2Utility
+++ b/OP2Utility
@@ -1 +1 @@
-Subproject commit 8584f064fdc8bc91cbc6b0bac2a116443c3b3a1b
+Subproject commit 7be4bbd1061f7ff2438fc3961c78b1a8b66ce6c1