diff --git a/backend/src/langs.ts b/backend/src/langs.ts
index d4f8b2d..ab421ea 100644
--- a/backend/src/langs.ts
+++ b/backend/src/langs.ts
@@ -384,6 +384,19 @@ output = "Hello, world!"
 
 main() ->
     io:fwrite("Hello, world!\\n").
+`,
+  },
+  factor: {
+    aliases: ["fact"],
+    name: "Factor",
+    monacoLang: "plaintext",
+    repl: "factor-lang",
+    main: ".factor-rc",
+    createEmpty: true,
+    run: "factor-lang",
+    template: `USE: io
+
+"Hello, world!" print
 `,
   },
   fish: {
diff --git a/scripts/docker-install-phase5.bash b/scripts/docker-install-phase5.bash
index f437f93..856cdf1 100755
--- a/scripts/docker-install-phase5.bash
+++ b/scripts/docker-install-phase5.bash
@@ -55,6 +55,13 @@ wget -nv https://s3.amazonaws.com/rebar3/rebar3
 chmod +x rebar3
 mv rebar3 /usr/bin/rebar3
 
+# Factor
+wget -nv https://downloads.factorcode.org/releases/0.98/factor-linux-x86-64-0.98.tar.gz
+tar -xf factor-linux-x86-64-*.tar.gz
+mv -T factor /opt/factor
+ln -s /opt/factor/factor /usr/bin/factor-lang
+rm factor-linux-x86-64-*.tar.gz
+
 # Go
 export GO111MODULE=on
 export GOPATH="$PWD/go"