diff --git a/backend/src/langs.ts b/backend/src/langs.ts
index 8db7526..ba3f894 100644
--- a/backend/src/langs.ts
+++ b/backend/src/langs.ts
@@ -31,6 +31,15 @@ export interface LangConfig {
 }
 
 export const langs: { [key: string]: LangConfig } = {
+  "><>": {
+    aliases: ["esofish"],
+    name: "><>",
+    main: "main.fish",
+    run: "esofish main.fish",
+    template: `"Hello, world!"r\\
+           o;!?l<
+`,
+  },
   ada: {
     aliases: ["adb"],
     name: "Ada",
diff --git a/scripts/docker-install-phase5.bash b/scripts/docker-install-phase5.bash
index ee2c836..a933ed7 100755
--- a/scripts/docker-install-phase5.bash
+++ b/scripts/docker-install-phase5.bash
@@ -19,6 +19,11 @@ wget -nv https://github.com/jgm/pandoc/releases/download/2.10/pandoc-2.10-linux-
 tar -xf pandoc-*-linux-amd64.tar.gz -C /usr --strip-components=1
 rm pandoc-*-linux-amd64.tar.gz
 
+# ><>
+wget -nv https://gist.githubusercontent.com/anonymous/6392418/raw/3b16018cb47f2f9ad1fa085c155cc5c0dc448b2d/fish.py -O /usr/bin/esofish
+sed -i 's:^#!.*:#!/usr/bin/env python3:' /usr/bin/esofish
+chmod +x /usr/bin/esofish
+
 # Ada
 wget -nv https://dl.bintray.com/reznikmm/ada-language-server/linux-latest.tar.gz
 tar -xf linux-latest.tar.gz