update ko in prow-tests image
@@ -42,7 +42,7 @@ RUN rm -rf /usr/local/go && \
rm "${GO_TARBALL}"
# Extra tools through go get
-RUN GO111MODULE=on go get github.com/google/ko/cmd/ko
+RUN GO111MODULE=on go get github.com/google/ko/cmd/ko@v0.3.0
RUN GO111MODULE=on go get github.com/boz/kail/cmd/kail
RUN go get -u github.com/golang/dep/cmd/dep
RUN go get -u github.com/jstemmer/go-junit-report
