diff --git a/packages/postcss-convert-values/package.json b/packages/postcss-convert-values/package.json
index e9df82566..882f10fec 100644
--- a/packages/postcss-convert-values/package.json
+++ b/packages/postcss-convert-values/package.json
@@ -28,7 +28,7 @@
   "repository": "cssnano/cssnano",
   "dependencies": {
     "postcss": "^7.0.16",
-    "postcss-value-parser": "^3.3.1"
+    "postcss-value-parser": "^4.1.0"
   },
   "bugs": {
     "url": "https://github.com/cssnano/cssnano/issues"
diff --git a/packages/postcss-convert-values/src/__tests__/index.js b/packages/postcss-convert-values/src/__tests__/index.js
index fb9031f0d..a221a3189 100644
--- a/packages/postcss-convert-values/src/__tests__/index.js
+++ b/packages/postcss-convert-values/src/__tests__/index.js
@@ -377,6 +377,13 @@ test(
   passthroughCSS('h1{top:0\\9\\0;left:0lightyear}')
 );
 
+test(
+  'should not try to convert keyframe names in animation',
+  passthroughCSS(
+    'h1{ -webkit-animation: e836684w2 } h2{ animation: e836684w2 }'
+  )
+);
+
 ['stroke-dasharray', 'stroke-dashoffset', 'stroke-width'].forEach(
   (property) => {
     test(
diff --git a/packages/postcss-convert-values/src/index.js b/packages/postcss-convert-values/src/index.js
index b0c7ec3a8..e6c98f325 100644
--- a/packages/postcss-convert-values/src/index.js
+++ b/packages/postcss-convert-values/src/index.js
@@ -24,7 +24,12 @@ function parseWord(node, opts, keepZeroUnit) {
   const pair = unit(node.value);
   if (pair) {
     const num = Number(pair.number);
-    const u = pair.unit;
+    let u = pair.unit;
+
+    if (u[0] === '.') {
+      u = u.slice(1);
+    }
+
     if (num === 0) {
       node.value =
         keepZeroUnit || (!~LENGTH_UNITS.indexOf(u.toLowerCase()) && u !== '%')
diff --git a/packages/postcss-convert-values/yarn.lock b/packages/postcss-convert-values/yarn.lock
index 566d20bac..16e251f78 100644
--- a/packages/postcss-convert-values/yarn.lock
+++ b/packages/postcss-convert-values/yarn.lock
@@ -40,10 +40,10 @@ has-flag@^3.0.0:
   resolved "https://registry.yarnpkg.com/has-flag/-/has-flag-3.0.0.tgz#b5d454dc2199ae225699f3467e5a07f3b955bafd"
   integrity sha1-tdRU3CGZriJWmfNGfloH87lVuv0=
 
-postcss-value-parser@^3.3.1:
-  version "3.3.1"
-  resolved "https://registry.yarnpkg.com/postcss-value-parser/-/postcss-value-parser-3.3.1.tgz#9ff822547e2893213cf1c30efa51ac5fd1ba8281"
-  integrity sha512-pISE66AbVkp4fDQ7VHBwRNXzAAKJjw4Vw7nWI/+Q3vuly7SNfgYXvm6i5IgFylHGK5sP/xHAbB7N49OS4gWNyQ==
+postcss-value-parser@^4.1.0:
+  version "4.1.0"
+  resolved "https://nexus-new.tcsbank.ru/repository/npm-all/postcss-value-parser/-/postcss-value-parser-4.1.0.tgz#443f6a20ced6481a2bda4fa8532a6e55d789a2cb"
+  integrity sha512-97DXOFbQJhk71ne5/Mt6cOu6yxsSfM0QGQyl0L25Gca4yGWEGJaig7l7gbCX623VqTBNGLRLaVUCnNkcedlRSQ==
 
 postcss@^7.0.16:
   version "7.0.27"