diff --git a/DESCRIPTION b/DESCRIPTION
index 555ba70..88764e7 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,10 +1,10 @@
 Type: Package
 Package: sasr
 Title: 'SAS' Interface
-Version: 0.1.3
-Date: 2025-02-20
+Version: 0.1.4
+Date: 2025-02-26
 Authors@R: c(
-    person("Liming", "Li", , "clark.liming@google.com", role = c("aut", "cre")),
+    person("Liming", "Li", , "clark.liming@gmail.com", role = c("aut", "cre")),
     person("Daniel", "Sabanes Bove", , "daniel.sabanesbove@gmail.com", role = "aut"),
     person("Isaac", "Gravestock", , "isaac.gravestock@roche.com", role = "aut"),
     person("F. Hoffmann-La Roche AG", role = c("cph", "fnd"))
diff --git a/NEWS.md b/NEWS.md
index 452076c..3a327f1 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,4 +1,4 @@
-# sasr 0.1.3
+# sasr 0.1.4
 
 * Add a basic SAS engine for knitr.
 * Update `sas_session` to allow finer control over the sas session.
diff --git a/R/sas_engine.R b/R/sas_engine.R
index e89e460..56c2b81 100644
--- a/R/sas_engine.R
+++ b/R/sas_engine.R
@@ -1,6 +1,9 @@
 #' SAS engine function
 #' @param options See knitr documentation on engines.
 sas_engine <- function(options) {
+  if (!requireNamespace("knitr", quietly = TRUE)) {
+    stop("Please install knitr to use the SAS engine.")
+  }
   if (options$eval) {
     ret <- sasr::run_sas(paste0(options$code, collapse = "\n"), results = "HTML")
     if (identical(ret$LST, "")) {
@@ -13,5 +16,5 @@ sas_engine <- function(options) {
     output <- NULL
   }
   options$results <- "asis"
-  engine_output(options, code = options$code, out = output)
+  knitr::engine_output(options, code = options$code, out = output)
 }
diff --git a/R/zzz.R b/R/zzz.R
index 706cb41..e12316d 100644
--- a/R/zzz.R
+++ b/R/zzz.R
@@ -14,7 +14,7 @@ saspy <- NULL
 .onLoad <- function(libname, pkgname) {
   options("sascfg" = "sascfg_personal.py")
   saspy <<- import("saspy", delay_load = TRUE)
-  if (require("knitr", quietly = TRUE)) {
+  if (requireNamespace("knitr", quietly = TRUE)) {
     knitr::knit_engines$set(sas = sas_engine)
   }
 }
diff --git a/man/sasr-package.Rd b/man/sasr-package.Rd
index c2cc446..b3b13cd 100644
--- a/man/sasr-package.Rd
+++ b/man/sasr-package.Rd
@@ -18,7 +18,7 @@ Useful links:
 
 }
 \author{
-\strong{Maintainer}: Liming Li \email{clark.liming@google.com}
+\strong{Maintainer}: Liming Li \email{clark.liming@gmail.com}
 
 Authors:
 \itemize{
diff --git a/tests/testthat/test-rmarkdown.R b/tests/testthat/test-rmarkdown.R
index 20c9eb9..2b40a4e 100644
--- a/tests/testthat/test-rmarkdown.R
+++ b/tests/testthat/test-rmarkdown.R
@@ -2,6 +2,6 @@
 test_that("rmarkdown engine works", {
   .sasr_env$.sas_session <- dummy_session
   expect_snapshot(
-    rmarkdown::render(system.file("example.Rmd", package = "sasr"), quiet = TRUE)
+    rmarkdown::render(system.file("example.Rmd", package = "sasr"), quiet = TRUE, output_dir = tempdir()),
   )
 })