diff --git a/package-lock.json b/package-lock.json
index 3d9dc05..132a3f9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,7 +10,7 @@
       "license": "ISC",
       "devDependencies": {
         "@queerviolet/speck": "github:queerviolet/speck",
-        "http-server": "^14"
+        "http-server": "14.1.0"
       }
     },
     "../spec-md": {
@@ -281,8 +281,10 @@
     },
     "node_modules/http-server": {
       "version": "14.1.0",
+      "resolved": "https://registry.npmjs.org/http-server/-/http-server-14.1.0.tgz",
       "integrity": "sha512-5lYsIcZtf6pdR8tCtzAHTWrAveo4liUlJdWc7YafwK/maPgYHs+VNP6KpCClmUnSorJrARVMXqtT055zBv11Yg==",
       "dev": true,
+      "license": "MIT",
       "dependencies": {
         "basic-auth": "^2.0.1",
         "chalk": "^4.1.2",
@@ -555,6 +557,7 @@
     },
     "ansi-styles": {
       "version": "4.3.0",
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       "dev": true,
       "requires": {
         "color-convert": "^2.0.1"
@@ -562,6 +565,7 @@
     },
     "async": {
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       "dev": true,
       "requires": {
         "lodash": "^4.17.14"
@@ -569,6 +573,7 @@
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     "basic-auth": {
       "version": "2.0.1",
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       "dev": true,
       "requires": {
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@@ -582,6 +587,7 @@
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       "version": "1.0.2",
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       "dev": true,
       "requires": {
         "function-bind": "^1.1.1",
@@ -590,6 +596,7 @@
     },
     "chalk": {
       "version": "4.1.2",
+      "integrity": "sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA==",
       "dev": true,
       "requires": {
         "ansi-styles": "^4.1.0",
@@ -598,6 +605,7 @@
     },
     "color-convert": {
       "version": "2.0.1",
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       "dev": true,
       "requires": {
         "color-name": "~1.1.4"
@@ -605,6 +613,7 @@
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     "color-name": {
       "version": "1.1.4",
+      "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
       "dev": true
     },
     "commander": {
@@ -615,10 +624,12 @@
     },
     "corser": {
       "version": "2.0.1",
+      "integrity": "sha1-jtolLsqrWEDc2XXOuQ2TcMgZ/4c=",
       "dev": true
     },
     "debug": {
       "version": "3.2.7",
+      "integrity": "sha512-CFjzYYAi4ThfiQvizrFQevTTXHtnCqWfe7x1AhgEscTz6ZbLbfoLRLPugTQyBth6f8ZERVUSyWHFD/7Wu4t1XQ==",
       "dev": true,
       "requires": {
         "ms": "^2.1.1"
@@ -626,18 +637,22 @@
     },
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       "version": "4.0.7",
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       "dev": true
     },
     "follow-redirects": {
       "version": "1.14.9",
+      "integrity": "sha512-MQDfihBQYMcyy5dhRDJUHcw7lb2Pv/TuE6xP1vyraLukNDHKbDxDNaOE3NbCAdKQApno+GPRyo1YAp89yCjK4w==",
       "dev": true
     },
     "function-bind": {
       "version": "1.1.1",
+      "integrity": "sha512-yIovAzMX49sF8Yl58fSCWJ5svSLuaibPxXQJFLmBObTuCr0Mf1KiPopGM9NiFjiYBCbfaa2Fh6breQ6ANVTI0A==",
       "dev": true
     },
     "get-intrinsic": {
       "version": "1.1.1",
+      "integrity": "sha512-kWZrnVM42QCiEA2Ig1bG8zjoIMOgxWwYCEeNdwY6Tv/cOSeGpcoX4pXHfKUxNKVoArnrEr2e9srnAxxGIraS9Q==",
       "dev": true,
       "requires": {
         "function-bind": "^1.1.1",
@@ -653,6 +668,7 @@
     },
     "has": {
       "version": "1.0.3",
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       "dev": true,
       "requires": {
         "function-bind": "^1.1.1"
@@ -660,18 +676,22 @@
     },
     "has-flag": {
       "version": "4.0.0",
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       "dev": true
     },
     "has-symbols": {
       "version": "1.0.3",
+      "integrity": "sha512-l3LCuF6MgDNwTDKkdYGEihYjt5pRPbEg46rtlmnSPlUbgmB8LOIrKJbYYFBSbnPaJexMKtiPO8hmeRjRz2Td+A==",
       "dev": true
     },
     "he": {
       "version": "1.2.0",
+      "integrity": "sha512-F/1DnUGPopORZi0ni+CvrCgHQ5FyEAHRLSApuYWMmrbSwoN2Mn/7k+Gl38gJnR7yyDZk6WLXwiGod1JOWNDKGw==",
       "dev": true
     },
     "html-encoding-sniffer": {
       "version": "3.0.0",
+      "integrity": "sha512-oWv4T4yJ52iKrufjnyZPkrN0CH3QnrUqdB6In1g5Fe1mia8GmF36gnfNySxoZtxD5+NmYw1EElVXiBk93UeskA==",
       "dev": true,
       "requires": {
         "whatwg-encoding": "^2.0.0"
@@ -679,6 +699,7 @@
     },
     "http-proxy": {
       "version": "1.18.1",
+      "integrity": "sha512-7mz/721AbnJwIVbnaSv1Cz3Am0ZLT/UBwkC92VlxhXv/k/BBQfM2fXElQNC27BVGr0uwUpplYPQM9LnaBMR5NQ==",
       "dev": true,
       "requires": {
         "eventemitter3": "^4.0.0",
@@ -688,6 +709,8 @@
     },
     "http-server": {
       "version": "14.1.0",
+      "resolved": "https://registry.npmjs.org/http-server/-/http-server-14.1.0.tgz",
+      "integrity": "sha512-5lYsIcZtf6pdR8tCtzAHTWrAveo4liUlJdWc7YafwK/maPgYHs+VNP6KpCClmUnSorJrARVMXqtT055zBv11Yg==",
       "dev": true,
       "requires": {
         "basic-auth": "^2.0.1",
@@ -707,6 +730,7 @@
     },
     "iconv-lite": {
       "version": "0.6.3",
+      "integrity": "sha512-4fCk79wshMdzMp2rH06qWrJE4iolqLhCUH+OiuIgU++RB0+94NlDL81atO7GX55uUKueo0txHNtvEyI6D7WdMw==",
       "dev": true,
       "requires": {
         "safer-buffer": ">= 2.1.2 < 3.0.0"
@@ -714,18 +738,22 @@
     },
     "lodash": {
       "version": "4.17.21",
+      "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==",
       "dev": true
     },
     "mime": {
       "version": "1.6.0",
+      "integrity": "sha512-x0Vn8spI+wuJ1O6S7gnbaQg8Pxh4NNHb7KSINmEWKiPE4RKOplvijn+NkmYmmRgP68mc70j2EbeTFRsrswaQeg==",
       "dev": true
     },
     "minimist": {
       "version": "1.2.6",
+      "integrity": "sha512-Jsjnk4bw3YJqYzbdyBiNsPWHPfO++UGG749Cxs6peCu5Xg4nrena6OVxOYxrQTqww0Jmwt+Ref8rggumkTLz9Q==",
       "dev": true
     },
     "mkdirp": {
       "version": "0.5.6",
+      "integrity": "sha512-FP+p8RB8OWpF3YZBCrP5gtADmtXApB5AMLn+vdyA+PyxCjrCs00mjyUozssO33cwDeT3wNGdLxJ5M//YqtHAJw==",
       "dev": true,
       "requires": {
         "minimist": "^1.2.6"
@@ -733,14 +761,17 @@
     },
     "ms": {
       "version": "2.1.3",
+      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
       "dev": true
     },
     "object-inspect": {
       "version": "1.12.0",
+      "integrity": "sha512-Ho2z80bVIvJloH+YzRmpZVQe87+qASmBUKZDWgx9cu+KDrX2ZDH/3tMy+gXbZETVGs2M8YdxObOh7XAtim9Y0g==",
       "dev": true
     },
     "opener": {
       "version": "1.5.2",
+      "integrity": "sha512-ur5UIdyw5Y7yEj9wLzhqXiy6GZ3Mwx0yGI+5sMn2r0N0v3cKJvUmFH5yPP+WXh9e0xfyzyJX95D8l088DNFj7A==",
       "dev": true
     },
     "pegjs": {
@@ -751,6 +782,7 @@
     },
     "portfinder": {
       "version": "1.0.28",
+      "integrity": "sha512-Se+2isanIcEqf2XMHjyUKskczxbPH7dQnlMjXX6+dybayyHvAf/TCgyMRlzf/B6QDhAEFOGes0pzRo3by4AbMA==",
       "dev": true,
       "requires": {
         "async": "^2.6.2",
@@ -766,6 +798,7 @@
     },
     "qs": {
       "version": "6.10.3",
+      "integrity": "sha512-wr7M2E0OFRfIfJZjKGieI8lBKb7fRCH4Fv5KNPEs7gJ8jadvotdsS08PzOKR7opXhZ/Xkjtt3WF9g38drmyRqQ==",
       "dev": true,
       "requires": {
         "side-channel": "^1.0.4"
@@ -773,22 +806,27 @@
     },
     "requires-port": {
       "version": "1.0.0",
+      "integrity": "sha1-kl0mAdOaxIXgkc8NpcbmlNw9yv8=",
       "dev": true
     },
     "safe-buffer": {
       "version": "5.1.2",
+      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
       "dev": true
     },
     "safer-buffer": {
       "version": "2.1.2",
+      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
       "dev": true
     },
     "secure-compare": {
       "version": "3.0.1",
+      "integrity": "sha1-8aAymzCLIh+uN7mXTz1XjQypmeM=",
       "dev": true
     },
     "side-channel": {
       "version": "1.0.4",
+      "integrity": "sha512-q5XPytqFEIKHkGdiMIrY10mvLRvnQh42/+GoBlFW3b2LXLE2xxJpZFdm94we0BaoV3RwJyGqg5wS7epxTv0Zvw==",
       "dev": true,
       "requires": {
         "call-bind": "^1.0.0",
@@ -822,6 +860,7 @@
     },
     "supports-color": {
       "version": "7.2.0",
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       "dev": true,
       "requires": {
         "has-flag": "^4.0.0"
@@ -840,6 +879,7 @@
     },
     "union": {
       "version": "0.5.0",
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       "dev": true,
       "requires": {
         "qs": "^6.4.0"
@@ -847,10 +887,12 @@
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       "version": "4.0.1",
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       "dev": true
     },
     "whatwg-encoding": {
       "version": "2.0.0",
+      "integrity": "sha512-p41ogyeMUrw3jWclHWTQg1k05DSVXPLcVxRTYsXUk+ZooOCZLcoYgPZ/HL/D/N+uQPOtcp1me1WhBEaX02mhWg==",
       "dev": true,
       "requires": {
         "iconv-lite": "0.6.3"
diff --git a/package.json b/package.json
index 5edfcc6..25037ac 100644
--- a/package.json
+++ b/package.json
@@ -11,6 +11,6 @@
   "license": "ISC",
   "devDependencies": {
     "@queerviolet/speck": "github:queerviolet/speck",
-    "http-server": "^14"
+    "http-server": "14.1.0"
   }
 }