diff --git a/README.md b/README.md
index 820cda6e..2cf3b8c7 100644
--- a/README.md
+++ b/README.md
@@ -154,4 +154,4 @@ edf %>%
   autoplot(smoothed_cases_daily)
 ```
 
-<img src="man/figures/README-unnamed-chunk-7-1.svg" width="90%" style="display: block; margin: auto;" />
+<img src="man/figures/README-unnamed-chunk-7-1.png" width="90%" style="display: block; margin: auto;" />
diff --git a/man/figures/README-unnamed-chunk-7-1.png b/man/figures/README-unnamed-chunk-7-1.png
new file mode 100644
index 00000000..58c00eda
Binary files /dev/null and b/man/figures/README-unnamed-chunk-7-1.png differ
diff --git a/vignettes/_common.R b/vignettes/_common.R
index b1882b73..3bd7c929 100644
--- a/vignettes/_common.R
+++ b/vignettes/_common.R
@@ -3,7 +3,6 @@ knitr::opts_chunk$set(
   comment = "#>",
   collapse = TRUE,
   cache = TRUE,
-  dev = "svg",
   dev.args = list(bg = "transparent"),
   dpi = 300,
   cache.lazy = FALSE,
diff --git a/vignettes/epiprocess.Rmd b/vignettes/epiprocess.Rmd
index d7c1c1e5..a455472b 100644
--- a/vignettes/epiprocess.Rmd
+++ b/vignettes/epiprocess.Rmd
@@ -107,7 +107,7 @@ edf %>%
 Detect outliers in daily reported cases for each geo_value. For a more in-depth
 guide to outlier detection, see `vignette("outliers")`.
 
-```{r}
+```{r message=FALSE}
 edf %>%
   group_by(geo_value) %>%
   mutate(outlier_info = detect_outlr(x = time_value, y = cases_daily)) %>%