diff --git a/README.Rmd b/README.Rmd
index 5be67153d..fa97783a4 100644
--- a/README.Rmd
+++ b/README.Rmd
@@ -141,7 +141,7 @@ Install it with the following commands:
 #| eval=FALSE
 install.packages("remotes")
 # To reproduce the first Part (chapters 1 to 8):
-install.packages('geocompkg', repos = c('https://geocompr.r-universe.dev', 'https://cloud.r-project.org'), dependencies = TRUE, force = TRUE)
+install.packages("geocompkg", repos = c("https://geocompr.r-universe.dev", "https://cloud.r-project.org"), dependencies = TRUE, force = TRUE)
 ```
 
 Installing `geocompkg` will also install core packages required for reproducing **Part I of the book** (chapters 1 to 8). 
@@ -154,8 +154,8 @@ To reproduce book **in its entirety**, run the following command (which installs
 #| eval=FALSE
 # Install packages to fully reproduce book (may take several minutes):
 options(repos = c(
-  geocompx = 'https://geocompx.r-universe.dev',
-  cran = 'https://cloud.r-project.org/'
+  geocompx = "https://geocompx.r-universe.dev",
+  cran = "https://cloud.r-project.org/"
 ))
 # From geocompx.r-universe.dev (recommended):
 install.packages("geocompkg", dependencies = TRUE)
@@ -262,7 +262,7 @@ for(i in script_names[45:length(script_names)]) {
 ```{r gen-stats, echo=FALSE, message=FALSE, warning=FALSE, eval=FALSE}
 # source("code/generate-chapter-code.R")
 book_stats = readr::read_csv("extdata/word-count-time.csv",
-                             col_types=('iiDd'))
+                             col_types = ("iiDd"))
 
 # to prevent excessive chapter count
 if (Sys.Date() > max(book_stats$date) + 5) {
diff --git a/README.md b/README.md
index 14f67d61d..b3c818df8 100644
--- a/README.md
+++ b/README.md
@@ -211,7 +211,7 @@ with the following commands:
 ``` r
 install.packages("remotes")
 # To reproduce the first Part (chapters 1 to 8):
-install.packages('geocompkg', repos = c('https://geocompr.r-universe.dev', 'https://cloud.r-project.org'), dependencies = TRUE, force = TRUE)
+install.packages("geocompkg", repos = c("https://geocompr.r-universe.dev", "https://cloud.r-project.org"), dependencies = TRUE, force = TRUE)
 ```
 
 Installing `geocompkg` will also install core packages required for
@@ -229,8 +229,8 @@ run!):
 ``` r
 # Install packages to fully reproduce book (may take several minutes):
 options(repos = c(
-  geocompx = 'https://geocompx.r-universe.dev',
-  cran = 'https://cloud.r-project.org/'
+  geocompx = "https://geocompx.r-universe.dev",
+  cran = "https://cloud.r-project.org/"
 ))
 # From geocompx.r-universe.dev (recommended):
 install.packages("geocompkg", dependencies = TRUE)