diff --git a/.changeset/renovate-abcbd6e2.md b/.changeset/renovate-abcbd6e2.md
new file mode 100644
index 0000000000..cdfd349938
--- /dev/null
+++ b/.changeset/renovate-abcbd6e2.md
@@ -0,0 +1,6 @@
+---
+'@backstage/plugin-scaffolder': patch
+'@backstage/plugin-techdocs': patch
+---
+
+revert dependency `event-source-polyfill` to `1.0.25`
diff --git a/.github/renovate.json5 b/.github/renovate.json5
index ff351a5e0f..a8bc3448a5 100644
--- a/.github/renovate.json5
+++ b/.github/renovate.json5
@@ -3,7 +3,7 @@
   extends: ['config:base', ':disableDependencyDashboard', ':gitSignOff'],
   rangeStrategy: 'update-lockfile',
   // @elastic/elasticsearch is ignored due to licensing issues. See #10992
-  ignoreDeps: ['@elastic/elasticsearch'],
+  ignoreDeps: ['@elastic/elasticsearch', 'event-source-polyfill'],
   packageRules: [
     {
       matchSourceUrlPrefixes: ['https://github.com/spotify/web-scripts'],
diff --git a/plugins/scaffolder/package.json b/plugins/scaffolder/package.json
index 7b2e255551..b76028e299 100644
--- a/plugins/scaffolder/package.json
+++ b/plugins/scaffolder/package.json
@@ -92,7 +92,7 @@
     "@types/jest": "^26.0.7",
     "@types/node": "^16.11.26",
     "cross-fetch": "^3.1.5",
-    "event-source-polyfill": "1.0.26",
+    "event-source-polyfill": "1.0.25",
     "msw": "^0.35.0"
   },
   "files": [
diff --git a/plugins/techdocs/package.json b/plugins/techdocs/package.json
index 81911dac7d..2f93fe2f73 100644
--- a/plugins/techdocs/package.json
+++ b/plugins/techdocs/package.json
@@ -52,7 +52,7 @@
     "@material-ui/lab": "4.0.0-alpha.57",
     "@material-ui/styles": "^4.10.0",
     "dompurify": "^2.2.9",
-    "event-source-polyfill": "1.0.26",
+    "event-source-polyfill": "1.0.25",
     "git-url-parse": "^11.6.0",
     "jss": "~10.8.2",
     "lodash": "^4.17.21",
diff --git a/yarn.lock b/yarn.lock
index 777d918095..94abca04c7 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -11952,10 +11952,10 @@ etag@~1.8.1:
   resolved "https://registry.npmjs.org/etag/-/etag-1.8.1.tgz#41ae2eeb65efa62268aebfea83ac7d79299b0887"
   integrity sha1-Qa4u62XvpiJorr/qg6x9eSmbCIc=
 
-event-source-polyfill@1.0.26:
-  version "1.0.26"
-  resolved "https://registry.npmjs.org/event-source-polyfill/-/event-source-polyfill-1.0.26.tgz#86c04d088ef078279168eefa028f928fec5059a4"
-  integrity sha512-IwDLs9fUTcGAyacHBeS53T8wcEkDyDn0UP4tfQqJ4wQP8AyH0mszuQf2ULTylnpI0sMquzJ4usrNV7+uztwI9A==
+event-source-polyfill@1.0.25:
+  version "1.0.25"
+  resolved "https://registry.npmjs.org/event-source-polyfill/-/event-source-polyfill-1.0.25.tgz#d8bb7f99cb6f8119c2baf086d9f6ee0514b6d9c8"
+  integrity sha512-hQxu6sN1Eq4JjoI7ITdQeGGUN193A2ra83qC0Ltm9I2UJVAten3OFVN6k5RX4YWeCS0BoC8xg/5czOCIHVosQg==
 
 event-stream@=3.3.4:
   version "3.3.4"