diff --git a/.circleci/config.yml b/.circleci/config.yml
index b16e7d4..1f19650 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -10,7 +10,7 @@ jobs:
   build:
     working_directory: /go/workdir/src/github.com/splunk/vault-plugin-splunk
     docker:
-      - image: circleci/golang:1.13.4
+      - image: goboring/golang:1.15.15b5
         <<: *defaultenv
       - image: splunk/splunk:latest
         user: root
diff --git a/Makefile b/Makefile
index 9c8b3bf..1b5d9e3 100644
--- a/Makefile
+++ b/Makefile
@@ -28,7 +28,7 @@ test: build
 	@test -n "$$SPLUNK_ADDR" || { echo 'warning: SPLUNK_ADDR not set, creating new Splunk instances.  This will be slow.'; }
 	mkdir -p $(dir $(TESTREPORT))
 	go clean -testcache || true
-	gotestsum --junitfile $(TESTREPORT) --format standard-verbose -- -cover -v ./...
+	$(GOBIN)/gotestsum --junitfile $(TESTREPORT) --format standard-verbose -- -cover -v ./...
 
 .PHONY: lint
 lint: dep
@@ -36,6 +36,7 @@ lint: dep
 
 .PHONY: dep
 dep:
+	go get -u gotest.tools/gotestsum
 	./scripts/golangci-lint.sh -b $(GOBIN) v1.20.0
 
 .PHONY: clean