diff --git a/.gitignore b/.gitignore
index eac5adc..8d6a672 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,11 +14,13 @@ __pycache__/
 .Python
 build/
 builddir/
+builddir-flatpak/
 develop-eggs/
 dist/
 downloads/
 eggs/
 .eggs/
+.flatpak-builder/
 lib/
 lib64/
 parts/
diff --git a/README.md b/README.md
index 945a83a..f67e3b2 100644
--- a/README.md
+++ b/README.md
@@ -84,6 +84,7 @@ writable directory on the pen drive).
 
 To install Diffuse locally:
 
+    flatpak install flatpak install runtime/org.gnome.Sdk/$(uname -p)/3.38
     flatpak-builder builddir-flatpak --user --install com.github.mightycreak.Diffuse.yml
 
 To run Diffuse through Flatpak:
diff --git a/com.github.mightycreak.Diffuse.yml b/com.github.mightycreak.Diffuse.yml
index 67144a2..cfbb5b4 100644
--- a/com.github.mightycreak.Diffuse.yml
+++ b/com.github.mightycreak.Diffuse.yml
@@ -1,6 +1,6 @@
 app-id: com.github.mightycreak.Diffuse
 runtime: org.gnome.Platform
-runtime-version: '3.36'
+runtime-version: '3.38'
 sdk: org.gnome.Sdk
 command: diffuse
 finish-args: