diff --git a/src/07-gbapp/building.md b/src/07-gbapp/building.md
index 0a247151..fc3f992f 100644
--- a/src/07-gbapp/building.md
+++ b/src/07-gbapp/building.md
@@ -94,6 +94,7 @@ sudo apt install -y \
     libglib2.0-dev \
     libgtk-3-dev \
     libwebkit2gtk-4.0-dev \
+    libjavascriptcoregtk-4.1-dev \
     libayatana-appindicator3-dev \
     librsvg2-dev
 ```
@@ -137,6 +138,7 @@ sudo dnf install -y \
     gobject-introspection-devel \
     gtk3-devel \
     webkit2gtk3-devel \
+    javascriptcore-gtk-devel \
     libappindicator-gtk3-devel \
     librsvg2-devel
 ```