diff --git a/package.json b/package.json
index 0ecf1e2..837c31e 100644
--- a/package.json
+++ b/package.json
@@ -9,6 +9,6 @@
   "dependencies": {
     "body-parser": "^1.19.2",
     "express": "^4.17.3",
-    "katex": "^0.15.3"
+    "katex": "~0.11.1"
   }
 }
diff --git a/yarn.lock b/yarn.lock
index 1c4d83e..7bb1468 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -36,10 +36,10 @@ bytes@3.1.2:
   resolved "https://registry.yarnpkg.com/bytes/-/bytes-3.1.2.tgz#8b0beeb98605adf1b128fa4386403c009e0221a5"
   integrity sha512-/Nf7TyzTx6S3yRJObOAV7956r8cr2+Oj8AC5dt8wSP3BQAoeX58NoHyCU8P8zGkNXStjTSi6fzO6F0pBdcYbEg==
 
-commander@^8.0.0:
-  version "8.3.0"
-  resolved "https://registry.yarnpkg.com/commander/-/commander-8.3.0.tgz#4837ea1b2da67b9c616a67afbb0fafee567bca66"
-  integrity sha512-OkTL9umf+He2DZkUq8f8J9of7yL6RJKI24dVITBmNfZBmri9zYZQrKkuXiKhyfPSu8tUhnVBB1iKXevvnlR4Ww==
+commander@^2.19.0:
+  version "2.20.3"
+  resolved "https://registry.yarnpkg.com/commander/-/commander-2.20.3.tgz#fd485e84c03eb4881c20722ba48035e8531aeb33"
+  integrity sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==
 
 content-disposition@0.5.4:
   version "0.5.4"
@@ -187,12 +187,12 @@ ipaddr.js@1.9.1:
   resolved "https://registry.yarnpkg.com/ipaddr.js/-/ipaddr.js-1.9.1.tgz#bff38543eeb8984825079ff3a2a8e6cbd46781b3"
   integrity sha512-0KI/607xoxSToH7GjN1FfSbLoU0+btTicjsQSWQlh/hZykN8KpmMf7uYwPW3R+akZ6R/w18ZlXSHBYXiYUPO3g==
 
-katex@^0.15.3:
-  version "0.15.3"
-  resolved "https://registry.yarnpkg.com/katex/-/katex-0.15.3.tgz#08781a7ed26800b20380d959d1ffcd62bca0ec14"
-  integrity sha512-Al6V7RJsmjklT9QItyHWGaQCt+NYTle1bZwB1e9MR/tLoIT1MXaHy9UpfGSB7eaqDgjjqqRxQOaQGrALCrEyBQ==
+katex@~0.11.1:
+  version "0.11.1"
+  resolved "https://registry.yarnpkg.com/katex/-/katex-0.11.1.tgz#df30ca40c565c9df01a466a00d53e079e84ffaa2"
+  integrity sha512-5oANDICCTX0NqYIyAiFCCwjQ7ERu3DQG2JFHLbYOf+fXaMoH8eg/zOq5WSYJsKMi/QebW+Eh3gSM+oss1H/bww==
   dependencies:
-    commander "^8.0.0"
+    commander "^2.19.0"
 
 media-typer@0.3.0:
   version "0.3.0"
diff --git a/yarn.nix b/yarn.nix
index f4f71e5..6c6795c 100644
--- a/yarn.nix
+++ b/yarn.nix
@@ -1,4 +1,4 @@
-{ fetchurl, fetchgit, linkFarm, runCommandNoCC, gnutar }: rec {
+{ fetchurl, fetchgit, linkFarm, runCommand, gnutar }: rec {
   offline_cache = linkFarm "offline" packages;
   packages = [
     {
@@ -34,11 +34,11 @@
       };
     }
     {
-      name = "commander___commander_8.3.0.tgz";
+      name = "commander___commander_2.20.3.tgz";
       path = fetchurl {
-        name = "commander___commander_8.3.0.tgz";
-        url  = "https://registry.yarnpkg.com/commander/-/commander-8.3.0.tgz";
-        sha1 = "4837ea1b2da67b9c616a67afbb0fafee567bca66";
+        name = "commander___commander_2.20.3.tgz";
+        url  = "https://registry.yarnpkg.com/commander/-/commander-2.20.3.tgz";
+        sha1 = "fd485e84c03eb4881c20722ba48035e8531aeb33";
       };
     }
     {
@@ -194,11 +194,11 @@
       };
     }
     {
-      name = "katex___katex_0.15.3.tgz";
+      name = "katex___katex_0.11.1.tgz";
       path = fetchurl {
-        name = "katex___katex_0.15.3.tgz";
-        url  = "https://registry.yarnpkg.com/katex/-/katex-0.15.3.tgz";
-        sha1 = "08781a7ed26800b20380d959d1ffcd62bca0ec14";
+        name = "katex___katex_0.11.1.tgz";
+        url  = "https://registry.yarnpkg.com/katex/-/katex-0.11.1.tgz";
+        sha1 = "df30ca40c565c9df01a466a00d53e079e84ffaa2";
       };
     }
     {