diff --git a/backend/src/langs.ts b/backend/src/langs.ts
index 5722564..f0a73ed 100644
--- a/backend/src/langs.ts
+++ b/backend/src/langs.ts
@@ -3238,6 +3238,22 @@ PLEASE LIKE AND SUBSCRIBE
       input: `echo "$x"`,
     },
     template: `echo "Hello, world!"
+`,
+  },
+  teco: {
+    aliases: ["mung"],
+    name: "TECO",
+    repl: "teco",
+    input: `123*234=\x1b\x1b`,
+    main: "main.txt",
+    compile: "cat main.txt | teco-encode > main.teco",
+    run: "mung main.teco",
+    scope: {
+      code: `123*234UX$$`,
+      input: `QX=\x1b\x1b`,
+    },
+    template: `IHello, world!
+$HT$$
 `,
   },
   tex: {
diff --git a/scripts/docker-install-phase6.bash b/scripts/docker-install-phase6.bash
index da190bf..95d3fb4 100755
--- a/scripts/docker-install-phase6.bash
+++ b/scripts/docker-install-phase6.bash
@@ -147,6 +147,16 @@ module.exports = { tokenize, Parser, Environment };
 EOF
 popd >/dev/null
 
+# TECO
+git clone https://github.com/blakemcbride/TECOC.git
+pushd TECOC/src >/dev/null
+make -f makefile.linux
+mv tecoc /usr/local/bin/tecoc
+ln -s /usr/local/bin/tecoc /usr/local/bin/teco
+ln -s /usr/local/bin/tecoc /usr/local/bin/mung
+popd >/dev/null
+rm -rf TECOC
+
 # Thue
 wget -nv "$(curl -sSL https://catseye.tc/distribution/Thue_distribution | grep -Eo 'https://catseye.tc/distfiles/thue-[^"]+\.zip' | head -n1)"
 unzip thue-*.zip
diff --git a/scripts/docker-install-phase7.bash b/scripts/docker-install-phase7.bash
index 742e467..9c10d0e 100755
--- a/scripts/docker-install-phase7.bash
+++ b/scripts/docker-install-phase7.bash
@@ -237,6 +237,20 @@ const env = new lang.Environment(runtime);
 env.run(ast);
 EOF
 
+# TECO
+tee /usr/local/bin/teco-encode >/dev/null <<"EOF"
+#!/usr/bin/env -S python3 -u
+
+import re
+import sys
+
+for line in sys.stdin:
+    line = re.sub(r"\^(.)", lambda m: chr(ord(m.group(1)) ^ 0b1000000), line)
+    line = line.replace("$", chr(27))
+    print(line, end="")
+EOF
+chmod +x /usr/local/bin/teco-encode
+
 # Unlambda
 tee /usr/local/bin/unlambda-repl >/dev/null <<"EOF"
 #!/usr/bin/env python3