diff --git a/cookbook/jwe.mjs b/cookbook/jwe.mjs
index 76c5ccd38d..20140c817a 100644
--- a/cookbook/jwe.mjs
+++ b/cookbook/jwe.mjs
@@ -1,70 +1,4 @@
 export default [
-  {
-    title:
-      'https://www.rfc-editor.org/rfc/rfc7520#section-5.1 - Key Encryption using RSA v1.5 and AES-HMAC-SHA2',
-    webcrypto: false,
-    reproducible: false,
-    input: {
-      plaintext:
-        'You can trust us to stick with you through thick and thin–to the bitter end. And you can trust us to keep any secret of yours–closer than you keep it yourself. But you cannot trust us to let you face trouble alone, and go off without a word. We are your friends, Frodo.',
-      key: {
-        kty: 'RSA',
-        ext: false,
-        kid: 'frodo.baggins@hobbiton.example',
-        use: 'enc',
-        n: 'maxhbsmBtdQ3CNrKvprUE6n9lYcregDMLYNeTAWcLj8NnPU9XIYegTHVHQjxKDSHP2l-F5jS7sppG1wgdAqZyhnWvXhYNvcM7RfgKxqNx_xAHx6f3yy7s-M9PSNCwPC2lh6UAkR4I00EhV9lrypM9Pi4lBUop9t5fS9W5UNwaAllhrd-osQGPjIeI1deHTwx-ZTHu3C60Pu_LJIl6hKn9wbwaUmA4cR5Bd2pgbaY7ASgsjCUbtYJaNIHSoHXprUdJZKUMAzV0WOKPfA6OPI4oypBadjvMZ4ZAj3BnXaSYsEZhaueTXvZB4eZOAjIyh2e_VOIKVMsnDrJYAVotGlvMQ',
-        e: 'AQAB',
-        d: 'Kn9tgoHfiTVi8uPu5b9TnwyHwG5dK6RE0uFdlpCGnJN7ZEi963R7wybQ1PLAHmpIbNTztfrheoAniRV1NCIqXaW_qS461xiDTp4ntEPnqcKsyO5jMAji7-CL8vhpYYowNFvIesgMoVaPRYMYT9TW63hNM0aWs7USZ_hLg6Oe1mY0vHTI3FucjSM86Nff4oIENt43r2fspgEPGRrdE6fpLc9Oaq-qeP1GFULimrRdndm-P8q8kvN3KHlNAtEgrQAgTTgz80S-3VD0FgWfgnb1PNmiuPUxO8OpI9KDIfu_acc6fg14nsNaJqXe6RESvhGPH2afjHqSy_Fd2vpzj85bQQ',
-        p: '2DwQmZ43FoTnQ8IkUj3BmKRf5Eh2mizZA5xEJ2MinUE3sdTYKSLtaEoekX9vbBZuWxHdVhM6UnKCJ_2iNk8Z0ayLYHL0_G21aXf9-unynEpUsH7HHTklLpYAzOOx1ZgVljoxAdWNn3hiEFrjZLZGS7lOH-a3QQlDDQoJOJ2VFmU',
-        q: 'te8LY4-W7IyaqH1ExujjMqkTAlTeRbv0VLQnfLY2xINnrWdwiQ93_VF099aP1ESeLja2nw-6iKIe-qT7mtCPozKfVtUYfz5HrJ_XY2kfexJINb9lhZHMv5p1skZpeIS-GPHCC6gRlKo1q-idn_qxyusfWv7WAxlSVfQfk8d6Et0',
-        dp: 'UfYKcL_or492vVc0PzwLSplbg4L3-Z5wL48mwiswbpzOyIgd2xHTHQmjJpFAIZ8q-zf9RmgJXkDrFs9rkdxPtAsL1WYdeCT5c125Fkdg317JVRDo1inX7x2Kdh8ERCreW8_4zXItuTl_KiXZNU5lvMQjWbIw2eTx1lpsflo0rYU',
-        dq: 'iEgcO-QfpepdH8FWd7mUFyrXdnOkXJBCogChY6YKuIHGc_p8Le9MbpFKESzEaLlN1Ehf3B6oGBl5Iz_ayUlZj2IoQZ82znoUrpa9fVYNot87ACfzIG7q9Mv7RiPAderZi03tkVXAdaBau_9vs5rS-7HMtxkVrxSUvJY14TkXlHE',
-        qi: 'kC-lzZOqoFaZCr5l0tOVtREKoVqaAYhQiqIRGL-MzS4sCmRkxm5vZlXYx6RtE1n_AagjqajlkjieGlxTTThHD8Iga6foGBMaAr5uR1hGQpSc7Gl7CF1DZkBJMTQN6EshYzZfxW08mIO8M6Rzuh0beL6fG9mkDcIyPrBXx2bQ_mM',
-      },
-      alg: 'RSA1_5',
-      enc: 'A128CBC-HS256',
-    },
-    generated: {
-      cek: '3qyTVhIWt5juqZUCpfRqpvauwB956MEJL2Rt-8qXKSo',
-      iv: 'bbd5sTkYwhAIqfHsx8DayA',
-    },
-    encrypting_key: {},
-    encrypting_content: {
-      protected: {
-        alg: 'RSA1_5',
-        kid: 'frodo.baggins@hobbiton.example',
-        enc: 'A128CBC-HS256',
-      },
-    },
-    output: {
-      compact:
-        'eyJhbGciOiJSU0ExXzUiLCJraWQiOiJmcm9kby5iYWdnaW5zQGhvYmJpdG9uLmV4YW1wbGUiLCJlbmMiOiJBMTI4Q0JDLUhTMjU2In0.laLxI0j-nLH-_BgLOXMozKxmy9gffy2gTdvqzfTihJBuuzxg0V7yk1WClnQePFvG2K-pvSlWc9BRIazDrn50RcRai__3TDON395H3c62tIouJJ4XaRvYHFjZTZ2GXfz8YAImcc91Tfk0WXC2F5Xbb71ClQ1DDH151tlpH77f2ff7xiSxh9oSewYrcGTSLUeeCt36r1Kt3OSj7EyBQXoZlN7IxbyhMAfgIe7Mv1rOTOI5I8NQqeXXW8VlzNmoxaGMny3YnGir5Wf6Qt2nBq4qDaPdnaAuuGUGEecelIO1wx1BpyIfgvfjOhMBs9M8XL223Fg47xlGsMXdfuY-4jaqVw.bbd5sTkYwhAIqfHsx8DayA.0fys_TY_na7f8dwSfXLiYdHaA2DxUjD67ieF7fcVbIR62JhJvGZ4_FNVSiGc_raa0HnLQ6s1P2sv3Xzl1p1l_o5wR_RsSzrS8Z-wnI3Jvo0mkpEEnlDmZvDu_k8OWzJv7eZVEqiWKdyVzFhPpiyQU28GLOpRc2VbVbK4dQKPdNTjPPEmRqcaGeTWZVyeSUvf5k59yJZxRuSvWFf6KrNtmRdZ8R4mDOjHSrM_s8uwIFcqt4r5GX8TKaI0zT5CbL5Qlw3sRc7u_hg0yKVOiRytEAEs3vZkcfLkP6nbXdC_PkMdNS-ohP78T2O6_7uInMGhFeX4ctHG7VelHGiT93JfWDEQi5_V9UN1rhXNrYu-0fVMkZAKX3VWi7lzA6BP430m.kvKuFBXHe5mQr4lqgobAUg',
-      json: {
-        recipients: [
-          {
-            encrypted_key:
-              'laLxI0j-nLH-_BgLOXMozKxmy9gffy2gTdvqzfTihJBuuzxg0V7yk1WClnQePFvG2K-pvSlWc9BRIazDrn50RcRai__3TDON395H3c62tIouJJ4XaRvYHFjZTZ2GXfz8YAImcc91Tfk0WXC2F5Xbb71ClQ1DDH151tlpH77f2ff7xiSxh9oSewYrcGTSLUeeCt36r1Kt3OSj7EyBQXoZlN7IxbyhMAfgIe7Mv1rOTOI5I8NQqeXXW8VlzNmoxaGMny3YnGir5Wf6Qt2nBq4qDaPdnaAuuGUGEecelIO1wx1BpyIfgvfjOhMBs9M8XL223Fg47xlGsMXdfuY-4jaqVw',
-          },
-        ],
-        protected:
-          'eyJhbGciOiJSU0ExXzUiLCJraWQiOiJmcm9kby5iYWdnaW5zQGhvYmJpdG9uLmV4YW1wbGUiLCJlbmMiOiJBMTI4Q0JDLUhTMjU2In0',
-        iv: 'bbd5sTkYwhAIqfHsx8DayA',
-        ciphertext:
-          '0fys_TY_na7f8dwSfXLiYdHaA2DxUjD67ieF7fcVbIR62JhJvGZ4_FNVSiGc_raa0HnLQ6s1P2sv3Xzl1p1l_o5wR_RsSzrS8Z-wnI3Jvo0mkpEEnlDmZvDu_k8OWzJv7eZVEqiWKdyVzFhPpiyQU28GLOpRc2VbVbK4dQKPdNTjPPEmRqcaGeTWZVyeSUvf5k59yJZxRuSvWFf6KrNtmRdZ8R4mDOjHSrM_s8uwIFcqt4r5GX8TKaI0zT5CbL5Qlw3sRc7u_hg0yKVOiRytEAEs3vZkcfLkP6nbXdC_PkMdNS-ohP78T2O6_7uInMGhFeX4ctHG7VelHGiT93JfWDEQi5_V9UN1rhXNrYu-0fVMkZAKX3VWi7lzA6BP430m',
-        tag: 'kvKuFBXHe5mQr4lqgobAUg',
-      },
-      json_flat: {
-        protected:
-          'eyJhbGciOiJSU0ExXzUiLCJraWQiOiJmcm9kby5iYWdnaW5zQGhvYmJpdG9uLmV4YW1wbGUiLCJlbmMiOiJBMTI4Q0JDLUhTMjU2In0',
-        encrypted_key:
-          'laLxI0j-nLH-_BgLOXMozKxmy9gffy2gTdvqzfTihJBuuzxg0V7yk1WClnQePFvG2K-pvSlWc9BRIazDrn50RcRai__3TDON395H3c62tIouJJ4XaRvYHFjZTZ2GXfz8YAImcc91Tfk0WXC2F5Xbb71ClQ1DDH151tlpH77f2ff7xiSxh9oSewYrcGTSLUeeCt36r1Kt3OSj7EyBQXoZlN7IxbyhMAfgIe7Mv1rOTOI5I8NQqeXXW8VlzNmoxaGMny3YnGir5Wf6Qt2nBq4qDaPdnaAuuGUGEecelIO1wx1BpyIfgvfjOhMBs9M8XL223Fg47xlGsMXdfuY-4jaqVw',
-        iv: 'bbd5sTkYwhAIqfHsx8DayA',
-        ciphertext:
-          '0fys_TY_na7f8dwSfXLiYdHaA2DxUjD67ieF7fcVbIR62JhJvGZ4_FNVSiGc_raa0HnLQ6s1P2sv3Xzl1p1l_o5wR_RsSzrS8Z-wnI3Jvo0mkpEEnlDmZvDu_k8OWzJv7eZVEqiWKdyVzFhPpiyQU28GLOpRc2VbVbK4dQKPdNTjPPEmRqcaGeTWZVyeSUvf5k59yJZxRuSvWFf6KrNtmRdZ8R4mDOjHSrM_s8uwIFcqt4r5GX8TKaI0zT5CbL5Qlw3sRc7u_hg0yKVOiRytEAEs3vZkcfLkP6nbXdC_PkMdNS-ohP78T2O6_7uInMGhFeX4ctHG7VelHGiT93JfWDEQi5_V9UN1rhXNrYu-0fVMkZAKX3VWi7lzA6BP430m',
-        tag: 'kvKuFBXHe5mQr4lqgobAUg',
-      },
-    },
-  },
   {
     title:
       'https://www.rfc-editor.org/rfc/rfc7520#section-5.2 - Key Encryption using RSA-OAEP with AES-GCM',
diff --git a/tap/jwk.ts b/tap/jwk.ts
index c92e26082f..550dcd84a1 100644
--- a/tap/jwk.ts
+++ b/tap/jwk.ts
@@ -35,7 +35,6 @@ export default (QUnit: QUnit, lib: typeof jose) => {
     ['RSA-OAEP-384', KEYS.RSA.jwk, true],
     ['RSA-OAEP-512', KEYS.RSA.jwk, true],
     ['RSA-OAEP', KEYS.RSA.jwk, true],
-    ['RSA1_5', KEYS.RSA.jwk, env.isNodeCrypto || env.isElectron],
   ]
 
   function publicJwk(jwk: JsonWebKey) {
diff --git a/tap/pem.ts b/tap/pem.ts
index 6a3546239a..2a12029e51 100644
--- a/tap/pem.ts
+++ b/tap/pem.ts
@@ -55,9 +55,6 @@ export default (QUnit: QUnit, lib: typeof jose) => {
     ['RSA-OAEP', KEYS.RSA.pkcs8, true],
     ['RSA-OAEP', KEYS.RSA.spki, true],
     ['RSA-OAEP', KEYS.RSA.x509, true],
-    ['RSA1_5', KEYS.RSA.pkcs8, env.isNodeCrypto || env.isElectron],
-    ['RSA1_5', KEYS.RSA.spki, env.isNodeCrypto || env.isElectron],
-    ['RSA1_5', KEYS.RSA.x509, env.isNodeCrypto || env.isElectron],
     [['ECDH-ES', 'P-256'], KEYS.P256.pkcs8, true],
     [['ECDH-ES', 'P-256'], KEYS.P256.spki, true],
     [['ECDH-ES', 'P-256'], KEYS.P256.x509, true],
diff --git a/tap/rsaes.ts b/tap/rsaes.ts
index 0795878b31..4fa0273190 100644
--- a/tap/rsaes.ts
+++ b/tap/rsaes.ts
@@ -1,5 +1,4 @@
 import type QUnit from 'qunit'
-import * as env from './env.js'
 import type * as jose from '../src/index.js'
 import * as roundtrip from './encrypt.js'
 
@@ -11,7 +10,6 @@ export default (QUnit: QUnit, lib: typeof jose) => {
 
   type Vector = [string, boolean]
   const algorithms: Vector[] = [
-    ['RSA1_5', env.isNodeCrypto || env.isElectron],
     ['RSA-OAEP', true],
     ['RSA-OAEP-256', true],
     ['RSA-OAEP-384', true],
diff --git a/test/jws/restrictions.test.mjs b/test/jws/restrictions.test.mjs
index 6e32c50c90..f74acfc940 100644
--- a/test/jws/restrictions.test.mjs
+++ b/test/jws/restrictions.test.mjs
@@ -122,5 +122,4 @@ test(testECDSASigEncoding, 'ES256')
 test(testECDSASigEncoding, 'ES384')
 test(testECDSASigEncoding, 'ES512')
 
-test(testRSAenc, 'RSA1_5')
 test(testECDSASigEncoding, 'ES256K')