diff --git a/backend/src/langs.ts b/backend/src/langs.ts
index f0a73ed..bce8e50 100644
--- a/backend/src/langs.ts
+++ b/backend/src/langs.ts
@@ -2884,6 +2884,20 @@ binding_irb.run(IRB.conf)
 `,
     skip: ["lsp"],
   },
+  sagemath: {
+    aliases: ["sage"],
+    name: "SageMath",
+    repl: "sage",
+    main: ".sage/init.sage",
+    createEmpty: ``,
+    run: "sage",
+    scope: {
+      code: `x = 123 * 234`,
+    },
+    template: `print("Hello, world!")
+`,
+    timeout: 10,
+  },
   sass: {
     name: "Sass",
     main: "main.sass",
diff --git a/scripts/docker-install-phase3d.bash b/scripts/docker-install-phase3d.bash
index 7e45a72..ae7e6c3 100755
--- a/scripts/docker-install-phase3d.bash
+++ b/scripts/docker-install-phase3d.bash
@@ -15,6 +15,9 @@ packages="
 # S-Lang
 slsh
 
+# SageMath
+sagemath
+
 # Scala
 scala