diff --git a/_pkgdown.yml b/_pkgdown.yml
index 0f3eb590..5f8581c0 100644
--- a/_pkgdown.yml
+++ b/_pkgdown.yml
@@ -1,4 +1,8 @@
 url: https://r-tmap.github.io/tmap/
 template:
   bootstrap: 5
+  bslib:
+    primary: "#5f8640"
 
+development:
+  mode: auto
diff --git a/examples/tm_basemap.R b/examples/tm_basemap.R
index 37f2dc1b..d5091f0c 100644
--- a/examples/tm_basemap.R
+++ b/examples/tm_basemap.R
@@ -1,7 +1,9 @@
-tm_basemap() +
-	tm_shape(World) +
-	tm_polygons("HPI")
-
-tm_basemap("OpenTopoMap") +
-	tm_shape(World) + 
-	tm_polygons(fill = NA, col = "black")
+if (requireNamespace("maptiles")) {
+	tm_basemap() +
+		tm_shape(World) +
+		tm_polygons("HPI")
+	
+	tm_basemap("OpenTopoMap") +
+		tm_shape(World) + 
+		tm_polygons(fill = NA, col = "black")
+}
diff --git a/man/tm_basemap.Rd b/man/tm_basemap.Rd
index 0fbea8ba..5b88cd2f 100644
--- a/man/tm_basemap.Rd
+++ b/man/tm_basemap.Rd
@@ -40,11 +40,13 @@ tm_tiles(
 Map layer that draws tiles from a tile server. \code{tm_basemap()} draws the tile layer as basemap, i.e. as bottom layer. In contrast,  \code{tm_tiles()} draws the tile layer as overlay layer, where the stacking order corresponds with the order in which this layer is called, just like other map layers.
 }
 \examples{
-tm_basemap() +
-	tm_shape(World) +
-	tm_polygons("HPI")
-
-tm_basemap("OpenTopoMap") +
-	tm_shape(World) + 
-	tm_polygons(fill = NA, col = "black")
+if (requireNamespace("maptiles")) {
+	tm_basemap() +
+		tm_shape(World) +
+		tm_polygons("HPI")
+	
+	tm_basemap("OpenTopoMap") +
+		tm_shape(World) + 
+		tm_polygons(fill = NA, col = "black")
+}
 }
diff --git a/tests/testthat/test-v3.R b/tests/testthat/test-v3.R
index a92772c4..bb9bb172 100644
--- a/tests/testthat/test-v3.R
+++ b/tests/testthat/test-v3.R
@@ -39,7 +39,7 @@ test_that("v3 syntax works", {
 	tm_shape(NLD_prov) +
 		tm_fill("name", legend.show = FALSE) +
 		tm_shape(NLD_muni) +
-		tm_polygons("MAP_COLORS", palette = "Greys", alpha = .25) +
+		tm_polygons("MAP_COLORS", palette = "Grays", alpha = .25) +
 		tm_shape(NLD_prov) +
 		tm_borders(lwd = 2) +
 		tm_text("name", shadow = TRUE) +
diff --git a/vignettes/tmap_sneak_peek.Rmd b/vignettes/tmap_sneak_peek.Rmd
index 3f75f453..7e297ec2 100644
--- a/vignettes/tmap_sneak_peek.Rmd
+++ b/vignettes/tmap_sneak_peek.Rmd
@@ -139,12 +139,14 @@ In **tmap v4**, there will be a direct function `tm_cartogram()` (using the **ca
 
 ```{r, class.source='bg-success', message=FALSE}
 # tmap v4
+if (requireNamespace("cartogram")) {
 tm_shape(World, crs = "+proj=eck4") +
 	tm_cartogram(size = "pop_est",
 				 fill = "HPI", 
 				 fill.scale = tm_scale_intervals(values = "purple_green"),
 				 fill.legend = tm_legend(title = "Happy Planet Index")) +
 	tm_place_legends_right(width = 0.2)
+}
 ```
 
 
@@ -168,6 +170,7 @@ tm_shape(World_carto) +
 
 ```{r, class.source='bg-success',message=FALSE}
 # tmap v4
+if (requireNamespace("cartogram")) {
 tm_shape(World, crs = "+proj=eck4") +
 	tm_cartogram(size = "pop_est",
 				 size.scale = tm_scale_continuous_log1p(),
@@ -175,6 +178,7 @@ tm_shape(World, crs = "+proj=eck4") +
 				 fill.scale = tm_scale_intervals(values = "purple_green"),
 				 fill.legend = tm_legend(title = "Happy Planet Index")) +
 	tm_place_legends_right(width = 0.2)
+}
 ```
 
 ## Scales
diff --git a/vignettes/tmap_vv.Rmd b/vignettes/tmap_vv.Rmd
index 49fc880b..3edb96a2 100644
--- a/vignettes/tmap_vv.Rmd
+++ b/vignettes/tmap_vv.Rmd
@@ -112,12 +112,14 @@ For those who are completely new to **tmap**: the function `tm_shape()` specifie
 In the next example we have three layers: a basemap from OpenTopoMap, country polygon boundaries, and dots for metropolitan areas:
 
 ```{r}
+if (requireNamespace("maptiles")) {
 tm_basemap(server = "OpenTopoMap", zoom = 2, alpha = 0.5) +
 tm_shape(World, bbox = sf::st_bbox(c(xmin = -180, xmax = 180, ymin = -86, ymax = 86))) +
 	tm_polygons(fill = NA, col = "black") +
 tm_shape(metro) +
 	tm_symbols(size = 0.1, col = "red") +
 tm_layout(inner.margins = rep(0, 4))
+}
 ```
 
 Each visual variable argument can also be specified with a data variable (e.g., a column name). What happens in that case is that the values of data variable are mapped to values of the corresponding visual variable.
@@ -152,8 +154,10 @@ This map uses a continuous color scale with colors from CARTO. More on scales la
 Besides visual variables, map layer may use spatial transformation variables.
 
 ```{r}
+if (requireNamespace("cartogram")) {
 tm_shape(World, crs = 8857) +
 	tm_cartogram(size = "pop_est", fill = "income_grp")
+}
 ```
 
 We used two variables: `size` to deform the polygons using a continuous cartogram and `fill` to color the polygons.