diff --git a/README.md b/README.md
index 8f2c185..2100711 100644
--- a/README.md
+++ b/README.md
@@ -24,8 +24,8 @@ KEY_CHUNK_LENGTH=5
 
 ```bash
 sed -i \
-  -e "s/PG_CHANGEME/$(openssl rand -base64 32)/" \
-  -e "s/API_CHANGEME/$(openssl rand -base64 48)/" \
+  -e "s/PG_CHANGEME/$(openssl rand -hex 32)/" \
+  -e "s/API_CHANGEME/$(openssl rand -hex 32)/" \
   .env
 ```