diff --git a/.changeset/real-chairs-arrive.md b/.changeset/real-chairs-arrive.md
new file mode 100644
index 0000000000..09551b44f9
--- /dev/null
+++ b/.changeset/real-chairs-arrive.md
@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-auth-backend': patch
+---
+
+Replace `passport-saml` with `@node-saml/passport-saml` (since 4.0.0).
diff --git a/plugins/auth-backend/package.json b/plugins/auth-backend/package.json
index 5cedf974a4..a199716713 100644
--- a/plugins/auth-backend/package.json
+++ b/plugins/auth-backend/package.json
@@ -47,6 +47,7 @@
     "@backstage/types": "workspace:^",
     "@davidzemon/passport-okta-oauth": "^0.0.5",
     "@google-cloud/firestore": "^6.0.0",
+    "@node-saml/passport-saml": "^4.0.4",
     "@types/express": "^4.17.6",
     "@types/passport": "^1.0.3",
     "compression": "^1.7.4",
@@ -77,7 +78,6 @@
     "passport-microsoft": "^1.0.0",
     "passport-oauth2": "^1.6.1",
     "passport-onelogin-oauth": "^0.0.1",
-    "passport-saml": "^3.1.2",
     "uuid": "^8.0.0",
     "winston": "^3.2.1",
     "yn": "^4.0.0"
diff --git a/plugins/auth-backend/src/providers/saml/provider.ts b/plugins/auth-backend/src/providers/saml/provider.ts
index 3d35f46628..d3170c710a 100644
--- a/plugins/auth-backend/src/providers/saml/provider.ts
+++ b/plugins/auth-backend/src/providers/saml/provider.ts
@@ -15,16 +15,16 @@
  */
 
 import express from 'express';
-import { SamlConfig } from 'passport-saml/lib/passport-saml/types';
+import { SamlConfig } from '@node-saml/passport-saml';
 import {
-  Strategy as SamlStrategy,
   Profile as SamlProfile,
+  Strategy as SamlStrategy,
+  VerifiedCallback,
   VerifyWithoutRequest,
-} from 'passport-saml';
+} from '@node-saml/passport-saml';
 import {
   executeFrameHandlerStrategy,
   executeRedirectStrategy,
-  PassportDoneCallback,
 } from '../../lib/passport';
 import {
   AuthProviderRouteHandlers,
@@ -62,17 +62,18 @@ export class SamlAuthProvider implements AuthProviderRouteHandlers {
     this.signInResolver = options.signInResolver;
     this.authHandler = options.authHandler;
     this.resolverContext = options.resolverContext;
-    this.strategy = new SamlStrategy({ ...options }, ((
-      fullProfile: SamlProfile,
-      done: PassportDoneCallback<SamlAuthResult>,
+    const verifier: VerifyWithoutRequest = (
+      profile: SamlProfile | null,
+      done: VerifiedCallback,
     ) => {
       // TODO: There's plenty more validation and profile handling to do here,
       //       this provider is currently only intended to validate the provider pattern
       //       for non-oauth auth flows.
       // TODO: This flow doesn't issue an identity token that can be used to validate
       //       the identity of the user in other backends, which we need in some form.
-      done(undefined, { fullProfile });
-    }) as VerifyWithoutRequest);
+      done(null, { fullProfile: profile });
+    };
+    this.strategy = new SamlStrategy(options, verifier, verifier);
   }
 
   async start(req: express.Request, res: express.Response): Promise<void> {
diff --git a/yarn.lock b/yarn.lock
index db84a7cbd0..00b4cad62b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4768,6 +4768,7 @@ __metadata:
     "@backstage/types": "workspace:^"
     "@davidzemon/passport-okta-oauth": ^0.0.5
     "@google-cloud/firestore": ^6.0.0
+    "@node-saml/passport-saml": ^4.0.4
     "@types/body-parser": ^1.19.0
     "@types/cookie-parser": ^1.4.2
     "@types/express": ^4.17.6
@@ -4810,7 +4811,6 @@ __metadata:
     passport-microsoft: ^1.0.0
     passport-oauth2: ^1.6.1
     passport-onelogin-oauth: ^0.0.1
-    passport-saml: ^3.1.2
     supertest: ^6.1.3
     uuid: ^8.0.0
     winston: ^3.2.1
@@ -13451,6 +13451,39 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@node-saml/node-saml@npm:^4.0.4":
+  version: 4.0.5
+  resolution: "@node-saml/node-saml@npm:4.0.5"
+  dependencies:
+    "@types/debug": ^4.1.7
+    "@types/passport": ^1.0.11
+    "@types/xml-crypto": ^1.4.2
+    "@types/xml-encryption": ^1.2.1
+    "@types/xml2js": ^0.4.11
+    "@xmldom/xmldom": ^0.8.6
+    debug: ^4.3.4
+    xml-crypto: ^3.0.1
+    xml-encryption: ^3.0.2
+    xml2js: ^0.5.0
+    xmlbuilder: ^15.1.1
+  checksum: 7d97575111a381ef2d0f16e1fc85ae3f84322ccba06dcb0594b00cf598e429658f45e479b78836943f69f249c08a8593e5168404acf7f1ed659ead53ceef465e
+  languageName: node
+  linkType: hard
+
+"@node-saml/passport-saml@npm:^4.0.4":
+  version: 4.0.4
+  resolution: "@node-saml/passport-saml@npm:4.0.4"
+  dependencies:
+    "@node-saml/node-saml": ^4.0.4
+    "@types/express": ^4.17.14
+    "@types/passport": ^1.0.11
+    "@types/passport-strategy": ^0.2.35
+    passport: ^0.6.0
+    passport-strategy: ^1.0.0
+  checksum: 75178669d7d47038c33bb0602454cb5030fc9b3ecdcae9163a35cef436bc6c22e68e57d06213e0118ff1cb0dcd2f2fa25112672ebe4cbad90578df21bec67fce
+  languageName: node
+  linkType: hard
+
 "@nodelib/fs.scandir@npm:2.1.5":
   version: 2.1.5
   resolution: "@nodelib/fs.scandir@npm:2.1.5"
@@ -17278,7 +17311,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/express@npm:*, @types/express@npm:^4.17.13, @types/express@npm:^4.17.17, @types/express@npm:^4.17.6":
+"@types/express@npm:*, @types/express@npm:^4.17.13, @types/express@npm:^4.17.14, @types/express@npm:^4.17.17, @types/express@npm:^4.17.6":
   version: 4.17.17
   resolution: "@types/express@npm:4.17.17"
   dependencies:
@@ -17971,7 +18004,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/passport@npm:*, @types/passport@npm:^1.0.3":
+"@types/passport@npm:*, @types/passport@npm:^1.0.11, @types/passport@npm:^1.0.3":
   version: 1.0.12
   resolution: "@types/passport@npm:1.0.12"
   dependencies:
@@ -18612,7 +18645,26 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/xml2js@npm:*, @types/xml2js@npm:^0.4.7":
+"@types/xml-crypto@npm:^1.4.2":
+  version: 1.4.2
+  resolution: "@types/xml-crypto@npm:1.4.2"
+  dependencies:
+    "@types/node": "*"
+    xpath: 0.0.27
+  checksum: 8fe8fc709ba070c46249800105301a533eb95e1a7a696986e4ac753aed1d238a826bce2b1e0d2548559e03f4e57bee27e26df69417766814bc0dd6a9bf2a1763
+  languageName: node
+  linkType: hard
+
+"@types/xml-encryption@npm:^1.2.1":
+  version: 1.2.1
+  resolution: "@types/xml-encryption@npm:1.2.1"
+  dependencies:
+    "@types/node": "*"
+  checksum: abfc6d779e1674c268258296e9c03b307cb80383c5d598c0cda1ad75dc901b8d4104b5818990086b08bac199dbe7374706913a29c58cf614a741847f912854f1
+  languageName: node
+  linkType: hard
+
+"@types/xml2js@npm:*, @types/xml2js@npm:^0.4.11, @types/xml2js@npm:^0.4.7":
   version: 0.4.11
   resolution: "@types/xml2js@npm:0.4.11"
   dependencies:
@@ -19151,13 +19203,20 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@xmldom/xmldom@npm:^0.7.0, @xmldom/xmldom@npm:^0.7.5, @xmldom/xmldom@npm:^0.7.6":
+"@xmldom/xmldom@npm:^0.7.5":
   version: 0.7.9
   resolution: "@xmldom/xmldom@npm:0.7.9"
   checksum: 66e37b7800132f891b885b2eceeeebc53f60b69789da10276f1584256b963d79a28c7ae2071bc53a9cd842d9b03554c761b2701fe8036d6052f26bcd0ae8f2bb
   languageName: node
   linkType: hard
 
+"@xmldom/xmldom@npm:^0.8.5, @xmldom/xmldom@npm:^0.8.6, @xmldom/xmldom@npm:^0.8.8":
+  version: 0.8.10
+  resolution: "@xmldom/xmldom@npm:0.8.10"
+  checksum: 4c136aec31fb3b49aaa53b6fcbfe524d02a1dc0d8e17ee35bd3bf35e9ce1344560481cd1efd086ad1a4821541482528672306d5e37cdbd187f33d7fadd3e2cf0
+  languageName: node
+  linkType: hard
+
 "@xobotyi/scrollbar-width@npm:^1.9.5":
   version: 1.9.5
   resolution: "@xobotyi/scrollbar-width@npm:1.9.5"
@@ -34987,21 +35046,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"passport-saml@npm:^3.1.2":
-  version: 3.2.4
-  resolution: "passport-saml@npm:3.2.4"
-  dependencies:
-    "@xmldom/xmldom": ^0.7.6
-    debug: ^4.3.2
-    passport-strategy: ^1.0.0
-    xml-crypto: ^2.1.3
-    xml-encryption: ^2.0.0
-    xml2js: ^0.4.23
-    xmlbuilder: ^15.1.1
-  checksum: 8e885af4d44c2d862b2ea0d051ab2a36bc6f9a70e62f90daf7ce4eefd126ac2ab4d5fc070693eba05f5e1be248af23fa018611bbfa7fad31708371f387f5dd77
-  languageName: node
-  linkType: hard
-
 "passport-strategy@npm:1.x.x, passport-strategy@npm:^1.0.0":
   version: 1.0.0
   resolution: "passport-strategy@npm:1.0.0"
@@ -43090,24 +43134,24 @@ __metadata:
   languageName: node
   linkType: hard
 
-"xml-crypto@npm:^2.1.3":
-  version: 2.1.3
-  resolution: "xml-crypto@npm:2.1.3"
+"xml-crypto@npm:^3.0.1":
+  version: 3.2.0
+  resolution: "xml-crypto@npm:3.2.0"
   dependencies:
-    "@xmldom/xmldom": ^0.7.0
+    "@xmldom/xmldom": ^0.8.8
     xpath: 0.0.32
-  checksum: 04273568b4ed3d1422b7e93ae7c5e8e14180e9d377038a5767ef6af4d1da2ec766f3a476f4cf0140ecedb93036dac63e563f60d9bb249c5a344d77c93c07ff87
+  checksum: 6c4974a7518307ea006dcfc1405f61c6738b45574b4d9d1e62f53b602bfcf894d34017f99d618f26f67c40a5e6d78e6228116ded2768b2ca5b2df5c8bf7774b7
   languageName: node
   linkType: hard
 
-"xml-encryption@npm:^2.0.0":
-  version: 2.0.0
-  resolution: "xml-encryption@npm:2.0.0"
+"xml-encryption@npm:^3.0.2":
+  version: 3.0.2
+  resolution: "xml-encryption@npm:3.0.2"
   dependencies:
-    "@xmldom/xmldom": ^0.7.0
+    "@xmldom/xmldom": ^0.8.5
     escape-html: ^1.0.3
     xpath: 0.0.32
-  checksum: a454445704c5e3aa3f992128c413c02f3c00c346cb0d63b01beae4b6a341cfc0a52a0219ccec47dcce250e336ba7b09d95909913b1f199ca43604961a00a1995
+  checksum: aac1b987d5de5becfc747c88c3a656c00799a153ab541078b875a69e1ac1f1c2f29bf85f22eab6a78382dc2919f79401a916cc392aba7994475919e0695893eb
   languageName: node
   linkType: hard
 
@@ -43125,7 +43169,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"xml2js@npm:^0.4.11, xml2js@npm:^0.4.19, xml2js@npm:^0.4.23":
+"xml2js@npm:^0.4.11, xml2js@npm:^0.4.19":
   version: 0.4.23
   resolution: "xml2js@npm:0.4.23"
   dependencies:
@@ -43135,6 +43179,16 @@ __metadata:
   languageName: node
   linkType: hard
 
+"xml2js@npm:^0.5.0":
+  version: 0.5.0
+  resolution: "xml2js@npm:0.5.0"
+  dependencies:
+    sax: ">=0.6.0"
+    xmlbuilder: ~11.0.0
+  checksum: 1aa71d62e5bc2d89138e3929b9ea46459157727759cbc62ef99484b778641c0cd21fb637696c052d901a22f82d092a3e740a16b4ce218e81ac59b933535124ea
+  languageName: node
+  linkType: hard
+
 "xml2js@npm:^0.6.0":
   version: 0.6.2
   resolution: "xml2js@npm:0.6.2"
@@ -43180,6 +43234,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"xpath@npm:0.0.27":
+  version: 0.0.27
+  resolution: "xpath@npm:0.0.27"
+  checksum: 51f45d211a9a552a8f6a12a474061e89bafb07e0aecd4bad18a557411feb975919c158e1a66e4ea0542198c6ed442481d9f709c625cca57b97aaedeaeded902e
+  languageName: node
+  linkType: hard
+
 "xpath@npm:0.0.32":
   version: 0.0.32
   resolution: "xpath@npm:0.0.32"