diff --git a/backend/src/langs.ts b/backend/src/langs.ts
index 047d438..be61c50 100644
--- a/backend/src/langs.ts
+++ b/backend/src/langs.ts
@@ -471,6 +471,16 @@ main = putStrLn "Hello, world!"
 `,
     hacks: ["ghci-config"],
   },
+  hcl: {
+    aliases: ["tf", "terraform", "hashicorp", "hc"],
+    name: "HCL",
+    monacoLang: "plaintext",
+    main: "main.hcl",
+    compile: "cat main.hcl | yj -cj > main.json",
+    run: "cat main.json | jq .",
+    template: `output = "Hello, world!"
+`,
+  },
   ink: {
     name: "Ink",
     monacoLang: "plaintext",
@@ -1064,6 +1074,16 @@ END
     lsp: "digestif",
     lspLang: "tex",
     template: `\\message{Hello, world!}
+`,
+  },
+  toml: {
+    aliases: ["tom"],
+    name: "TOML",
+    monacoLang: "plaintext",
+    main: "main.toml",
+    compile: "cat main.toml | yj -tj > main.json",
+    run: "cat main.json | jq .",
+    template: `output = "Hello, world!"
 `,
   },
   typescript: {
@@ -1157,6 +1177,16 @@ main:
 	.data
 message:
 	.string "Hello, world!\\n"
+`,
+  },
+  yaml: {
+    aliases: ["yml"],
+    name: "YAML",
+    monacoLang: "yaml",
+    main: "main.yaml",
+    compile: "cat main.yaml | yj -yj > main.json",
+    run: "cat main.json | jq .",
+    template: `output: "Hello, world!"
 `,
   },
   zsh: {
diff --git a/scripts/docker-install-phase3d.bash b/scripts/docker-install-phase3d.bash
index 7766f19..5917be0 100755
--- a/scripts/docker-install-phase3d.bash
+++ b/scripts/docker-install-phase3d.bash
@@ -57,6 +57,9 @@ python3.7
 # x86
 clang
 
+# YAML
+jq
+
 # Zsh
 zsh
 
diff --git a/scripts/docker-install-phase5.bash b/scripts/docker-install-phase5.bash
index 36c432a..329d5c6 100755
--- a/scripts/docker-install-phase5.bash
+++ b/scripts/docker-install-phase5.bash
@@ -65,6 +65,11 @@ gdown "https://drive.google.com/uc?export=download&id=1GPoR_ja4ns16KCamRgwB-JVag
 gdown "https://drive.google.com/uc?export=download&id=1qSxj8JjAeetAmNjUGayX0RBARgr5R4Ij" /opt/haskell/hoogle.hoo
 chmod +x /usr/bin/hie
 
+# HCL/TOML/YAML
+wget -nv https://github.com/sclevine/yj/releases/download/v4.0.0/yj-linux
+chmod +x yj-linux
+mv yj-linux /usr/bin/yj
+
 # Ink
 wget -nv https://github.com/thesephist/ink/releases/download/v0.1.7/ink-linux
 wget -nv https://github.com/thesephist/ink/releases/download/v0.1.7/std.ink