diff --git a/backend/src/langs.ts b/backend/src/langs.ts
index e53b6a5..8b096f3 100644
--- a/backend/src/langs.ts
+++ b/backend/src/langs.ts
@@ -1217,6 +1217,19 @@ int main() {
     main: "main.gbs",
     run: "gbs3 main.gbs",
     template: `Print "Hello, world!"
+`,
+  },
+  gap: {
+    name: "GAP",
+    repl: "gap",
+    input: `123 * 234;`,
+    main: "main.gap",
+    run: "gap main.gap",
+    scope: {
+      code: `x := 123 * 234;`,
+      input: `123 * 234;`,
+    },
+    template: `Print("Hello, world!\\n");
 `,
   },
   go: {
diff --git a/scripts/docker-install-phase3b.bash b/scripts/docker-install-phase3b.bash
index 5c19d8e..e5870f5 100755
--- a/scripts/docker-install-phase3b.bash
+++ b/scripts/docker-install-phase3b.bash
@@ -48,6 +48,9 @@ gforth
 # Gambas
 gambas3-script
 
+# GAP
+gap
+
 # Go
 golang