diff --git a/package.json b/package.json
index a28c37b74d2..b2537120400 100644
--- a/package.json
+++ b/package.json
@@ -89,14 +89,14 @@
     "@babel/plugin-transform-shorthand-properties": "^7.2.0",
     "@babel/plugin-transform-spread": "^7.2.2",
     "@babel/plugin-transform-template-literals": "^7.2.0",
-    "@glimmer/compiler": "^0.37.0",
+    "@glimmer/compiler": "^0.37.1",
     "@glimmer/env": "^0.1.7",
-    "@glimmer/interfaces": "^0.37.0",
-    "@glimmer/node": "^0.37.0",
-    "@glimmer/opcode-compiler": "^0.37.0",
-    "@glimmer/program": "^0.37.0",
-    "@glimmer/reference": "^0.37.0",
-    "@glimmer/runtime": "^0.37.0",
+    "@glimmer/interfaces": "^0.37.1",
+    "@glimmer/node": "^0.37.1",
+    "@glimmer/opcode-compiler": "^0.37.1",
+    "@glimmer/program": "^0.37.1",
+    "@glimmer/reference": "^0.37.1",
+    "@glimmer/runtime": "^0.37.1",
     "@types/qunit": "^2.5.3",
     "@types/rsvp": "^4.0.2",
     "auto-dist-tag": "^1.0.0",
diff --git a/packages/@ember/-internals/glimmer/tests/integration/components/angle-bracket-invocation-test.js b/packages/@ember/-internals/glimmer/tests/integration/components/angle-bracket-invocation-test.js
index eeb243aa60c..59ed820f073 100644
--- a/packages/@ember/-internals/glimmer/tests/integration/components/angle-bracket-invocation-test.js
+++ b/packages/@ember/-internals/glimmer/tests/integration/components/angle-bracket-invocation-test.js
@@ -855,6 +855,70 @@ if (EMBER_GLIMMER_ANGLE_BRACKET_INVOCATION) {
         });
       }
 
+      '@test can forward ...attributes to dynamic component invocation ("splattributes")'() {
+        this.registerComponent('x-outer', {
+          ComponentClass: Component.extend({ tagName: '' }),
+          template: '<XInner ...attributes>{{yield}}</XInner>',
+        });
+
+        this.registerComponent('x-inner', {
+          ComponentClass: Component.extend({ tagName: '' }),
+          template: '<div ...attributes>{{yield}}</div>',
+        });
+
+        this.render(strip`
+          {{#let (component 'x-outer') as |Thing|}}
+            <Thing data-foo>Hello!</Thing>
+          {{/let}}
+        `);
+
+        this.assertElement(this.firstChild, {
+          tagName: 'div',
+          attrs: { 'data-foo': '' },
+          content: 'Hello!',
+        });
+      }
+
+      '@test an inner angle invocation can forward ...attributes through dynamic component invocation ("splattributes")'() {
+        this.registerComponent('x-outer', {
+          ComponentClass: Component.extend({ tagName: '' }),
+          template: `{{#let (component 'x-inner') as |Thing|}}<Thing ...attributes>{{yield}}</Thing>{{/let}}`,
+        });
+
+        this.registerComponent('x-inner', {
+          ComponentClass: Component.extend({ tagName: '' }),
+          template: '<div ...attributes>{{yield}}</div>',
+        });
+
+        this.render('<XOuter data-foo>Hello!</XOuter>');
+
+        this.assertElement(this.firstChild, {
+          tagName: 'div',
+          attrs: { 'data-foo': '' },
+          content: 'Hello!',
+        });
+      }
+
+      '@test an inner angle invocation can forward ...attributes through static component invocation ("splattributes")'() {
+        this.registerComponent('x-outer', {
+          ComponentClass: Component.extend({ tagName: '' }),
+          template: `<XInner ...attributes>{{yield}}</XInner>`,
+        });
+
+        this.registerComponent('x-inner', {
+          ComponentClass: Component.extend({ tagName: '' }),
+          template: '<div ...attributes>{{yield}}</div>',
+        });
+
+        this.render('<XOuter data-foo>Hello!</XOuter>');
+
+        this.assertElement(this.firstChild, {
+          tagName: 'div',
+          attrs: { 'data-foo': '' },
+          content: 'Hello!',
+        });
+      }
+
       '@test can include `...attributes` in multiple elements in tagless component ("splattributes")'() {
         this.registerComponent('foo-bar', {
           ComponentClass: Component.extend({ tagName: '' }),
@@ -919,6 +983,41 @@ if (EMBER_GLIMMER_ANGLE_BRACKET_INVOCATION) {
           content: 'world',
         });
       }
+
+      '@test can yield content to contextual components invoked with angle-bracket components that receives splattributes'() {
+        this.registerComponent('foo-bar/inner', {
+          ComponentClass: Component.extend({ tagName: '' }),
+          template: '<h1 ...attributes>{{yield}}</h1>',
+        });
+        this.registerComponent('foo-bar', {
+          ComponentClass: Component.extend({ tagName: '' }),
+          // If <Inner> doesn't receive splattributes this test passes
+          template: strip`
+            {{#let (component "foo-bar/inner") as |Inner|}}
+              <Inner ...attributes>{{yield}}</Inner>
+              <h2>Inside the let</h2>
+            {{/let}}
+            <h3>Outside the let</h3>
+          `,
+        });
+
+        this.render('<FooBar>Yielded content</FooBar>');
+        this.assertElement(this.firstChild, {
+          tagName: 'h1',
+          attrs: {},
+          content: 'Yielded content',
+        });
+        this.assertElement(this.nthChild(1), {
+          tagName: 'h2',
+          attrs: {},
+          content: 'Inside the let',
+        });
+        this.assertElement(this.nthChild(2), {
+          tagName: 'h3',
+          attrs: {},
+          content: 'Outside the let',
+        });
+      }
     }
   );
 }
diff --git a/packages/@ember/-internals/glimmer/tests/integration/custom-component-manager-test.js b/packages/@ember/-internals/glimmer/tests/integration/custom-component-manager-test.js
index 5608f28aec9..f0bcb33e2ab 100644
--- a/packages/@ember/-internals/glimmer/tests/integration/custom-component-manager-test.js
+++ b/packages/@ember/-internals/glimmer/tests/integration/custom-component-manager-test.js
@@ -305,6 +305,58 @@ if (GLIMMER_CUSTOM_COMPONENT_MANAGER) {
         this.assertHTML(`<p>Chad Hietala</p>`);
       }
 
+      ['@test it can set positional params on the component instance']() {
+        let ComponentClass = setComponentManager(
+          createBasicManager,
+          EmberObject.extend({
+            salutation: computed('args.positional', function() {
+              return this.args.positional[0] + ' ' + this.args.positional[1];
+            }),
+          })
+        );
+
+        this.registerComponent('foo-bar', {
+          template: `<p>{{salutation}}</p>`,
+          ComponentClass,
+        });
+
+        this.render('{{foo-bar "Yehuda" "Katz"}}');
+
+        this.assertHTML(`<p>Yehuda Katz</p>`);
+      }
+
+      ['@test positional params are updated if they change']() {
+        let ComponentClass = setComponentManager(
+          createBasicManager,
+          EmberObject.extend({
+            salutation: computed('args.positional', function() {
+              return this.args.positional[0] + ' ' + this.args.positional[1];
+            }),
+          })
+        );
+
+        this.registerComponent('foo-bar', {
+          template: `<p>{{salutation}}</p>`,
+          ComponentClass,
+        });
+
+        this.render('{{foo-bar firstName lastName}}', {
+          firstName: 'Yehuda',
+          lastName: 'Katz',
+        });
+
+        this.assertHTML(`<p>Yehuda Katz</p>`);
+
+        runTask(() =>
+          setProperties(this.context, {
+            firstName: 'Chad',
+            lastName: 'Hietala',
+          })
+        );
+
+        this.assertHTML(`<p>Chad Hietala</p>`);
+      }
+
       ['@test it can opt-in to running destructor'](assert) {
         let ComponentClass = setComponentManager(
           () => {
diff --git a/yarn.lock b/yarn.lock
index 38b5bad78d8..d47da35bd7b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -598,120 +598,120 @@
     lodash "^4.17.10"
     to-fast-properties "^2.0.0"
 
-"@glimmer/compiler@^0.37.0":
-  version "0.37.0"
-  resolved "https://registry.yarnpkg.com/@glimmer/compiler/-/compiler-0.37.0.tgz#861d9c8064b54c24895262e1dd6a805cf24b8175"
-  integrity sha512-h01QJvqzClYw6Y5+DptqaB74KeBz14fsbNlig2O1sH5B2RKXRXo6T/OFSlFO/BHdzPLIrhyrkNQ/pooy2nTNmQ==
+"@glimmer/compiler@^0.37.1":
+  version "0.37.1"
+  resolved "https://registry.yarnpkg.com/@glimmer/compiler/-/compiler-0.37.1.tgz#a3d59e0b1e51341314d3f8202aa0d4b70dc55173"
+  integrity sha512-bGdRb52eWZuHEGaIa1Rl0e0f4vPpQtp+gnpsaRwBMmRLqDrCZKdEJ8jCN5bI8TMFbtvP78s/5O0qi/XK+UzO4A==
   dependencies:
-    "@glimmer/interfaces" "^0.37.0"
-    "@glimmer/syntax" "^0.37.0"
-    "@glimmer/util" "^0.37.0"
-    "@glimmer/wire-format" "^0.37.0"
+    "@glimmer/interfaces" "^0.37.1"
+    "@glimmer/syntax" "^0.37.1"
+    "@glimmer/util" "^0.37.1"
+    "@glimmer/wire-format" "^0.37.1"
 
-"@glimmer/encoder@^0.37.0":
-  version "0.37.0"
-  resolved "https://registry.yarnpkg.com/@glimmer/encoder/-/encoder-0.37.0.tgz#3689bb8dbdbce4ae45783b447d1a7fcc40c067c2"
-  integrity sha512-NS5UTeBZd0GRQYpUVQ/sSYriHxAPLSb4z1qlRzWQCfJmovtMRRYgcFpyRck/ckmFsXdlfDL+Nu0hJLOcYU+oXQ==
+"@glimmer/encoder@^0.37.1":
+  version "0.37.1"
+  resolved "https://registry.yarnpkg.com/@glimmer/encoder/-/encoder-0.37.1.tgz#5cd95e04043c74ee4253811a768871b02fcd12c5"
+  integrity sha512-XvtlyFYibYxwYBfak5NK62u/iNtOgP1hbccxJNuDgK2pwYakrnZX6KSOg/6QnFNknjJkSQ/cwpW696ROliPTfw==
 
 "@glimmer/env@^0.1.7":
   version "0.1.7"
   resolved "https://registry.yarnpkg.com/@glimmer/env/-/env-0.1.7.tgz#fd2d2b55a9029c6b37a6c935e8c8871ae70dfa07"
   integrity sha1-/S0rVakCnGs3psk16MiHGucN+gc=
 
-"@glimmer/interfaces@^0.37.0":
-  version "0.37.0"
-  resolved "https://registry.yarnpkg.com/@glimmer/interfaces/-/interfaces-0.37.0.tgz#7e16dc3b44369ea084e13064dd30ec14ed86623f"
-  integrity sha512-tLvn6O0SqPotkQy/I/PBgnUorho+kim7psitpAZQMljOY8ocSf0+dfIY4GKQsTqefbpHbmdu4dYBhyy09xDJag==
+"@glimmer/interfaces@^0.37.1":
+  version "0.37.1"
+  resolved "https://registry.yarnpkg.com/@glimmer/interfaces/-/interfaces-0.37.1.tgz#44328c49d835445fda26efa7c8d5463ee2e626ed"
+  integrity sha512-ys5I6iEeaPvSPY9dn6uc9NAh9HkL8fnUZjTHJhlKV5nFv5qqXhBK8hFE86fVXqGRtXLHfOa90pg75vLXgw7u/g==
   dependencies:
-    "@glimmer/wire-format" "^0.37.0"
+    "@glimmer/wire-format" "^0.37.1"
     "@simple-dom/interface" "1.4.0"
 
-"@glimmer/low-level@^0.37.0":
-  version "0.37.0"
-  resolved "https://registry.yarnpkg.com/@glimmer/low-level/-/low-level-0.37.0.tgz#ef49a49abb829c5ffcf539c3408cc545df688875"
-  integrity sha512-OFPE0KVUbSsQhpJpwI2zmG+1+y0NkpSJzn4qQ1kuKzpk50TABeTBo8ycqJFTgYh/cjus/W212G2YgEN/YXZqZw==
-
-"@glimmer/node@^0.37.0":
-  version "0.37.0"
-  resolved "https://registry.yarnpkg.com/@glimmer/node/-/node-0.37.0.tgz#cbf51153ec3d3e858314b95f249c8c80f458fa23"
-  integrity sha512-f2F/ttR1J3pkOLBGEuR/I+Z4tNKLuii5983LnUB6UDW0DKbz3DZwkejVcYr6wxhaU5QuD5RWl+AkaREOfZuh7w==
-  dependencies:
-    "@glimmer/interfaces" "^0.37.0"
-    "@glimmer/runtime" "^0.37.0"
-
-"@glimmer/opcode-compiler@^0.37.0":
-  version "0.37.0"
-  resolved "https://registry.yarnpkg.com/@glimmer/opcode-compiler/-/opcode-compiler-0.37.0.tgz#26b37cc3a569ba88377e373d602f518b65b36cc3"
-  integrity sha512-a+wMGHXTnzrvapFzyxx7tE73msnnIFCDy7O5vH/gnwNqy8VEGeXperJDpwZxxn0SnSVtwvCPJ+85MXFDmcfrvQ==
-  dependencies:
-    "@glimmer/encoder" "^0.37.0"
-    "@glimmer/interfaces" "^0.37.0"
-    "@glimmer/program" "^0.37.0"
-    "@glimmer/reference" "^0.37.0"
-    "@glimmer/util" "^0.37.0"
-    "@glimmer/vm" "^0.37.0"
-    "@glimmer/wire-format" "^0.37.0"
-
-"@glimmer/program@^0.37.0":
-  version "0.37.0"
-  resolved "https://registry.yarnpkg.com/@glimmer/program/-/program-0.37.0.tgz#25aaa78363216a47074246c4ddea0d6241e3295b"
-  integrity sha512-wsu9R5+ytndMJg4AXBGm8dJax3q/vk5PkSxl8VHi5jxje4Ja/8AjJl7SpE2nRCfmLpq8rV6vHSmZaKY1tSRANQ==
-  dependencies:
-    "@glimmer/encoder" "^0.37.0"
-    "@glimmer/interfaces" "^0.37.0"
-    "@glimmer/util" "^0.37.0"
-
-"@glimmer/reference@^0.37.0":
-  version "0.37.0"
-  resolved "https://registry.yarnpkg.com/@glimmer/reference/-/reference-0.37.0.tgz#5910810d932a03f5bb62014caa9733cecf0683ed"
-  integrity sha512-NCYlu9X0ok7pJiGb/Uevv/84xA1Z49PHDUcDrN0X/bDzSI/zoFy//wPevjPO/+ihBtD5Hy9Ve3eC/lfSSWsWVA==
-  dependencies:
-    "@glimmer/util" "^0.37.0"
-
-"@glimmer/runtime@^0.37.0":
-  version "0.37.0"
-  resolved "https://registry.yarnpkg.com/@glimmer/runtime/-/runtime-0.37.0.tgz#b1ec8303f6a97141310bb4fe3ecac7396311381a"
-  integrity sha512-U9FKj4id2HwA1FTVJLFWpCIsICOaIZklwhTHHd7XrtoETdFaesn7/4e3fH/LNx0BrPkXy6dfD/9I7izLFM4ToQ==
-  dependencies:
-    "@glimmer/interfaces" "^0.37.0"
-    "@glimmer/low-level" "^0.37.0"
-    "@glimmer/program" "^0.37.0"
-    "@glimmer/reference" "^0.37.0"
-    "@glimmer/util" "^0.37.0"
-    "@glimmer/vm" "^0.37.0"
-    "@glimmer/wire-format" "^0.37.0"
+"@glimmer/low-level@^0.37.1":
+  version "0.37.1"
+  resolved "https://registry.yarnpkg.com/@glimmer/low-level/-/low-level-0.37.1.tgz#307f818b20b8df43c04750c01eb92ead2af4b455"
+  integrity sha512-CIscEE0BKNMlx6PCNUJVyPWYGCwtfoYTbwUIyQdY5IeVXLvBweT8fteMmHv4HapsPCKubPPkvwwm3bgBLSq3dA==
+
+"@glimmer/node@^0.37.1":
+  version "0.37.1"
+  resolved "https://registry.yarnpkg.com/@glimmer/node/-/node-0.37.1.tgz#f401e366b6b6d71a16f9aa7e3fddaeb7f9cf7b3b"
+  integrity sha512-eQiIhfx3MJqXhjDTqQMtzAfI+IJ+5aw0bLXjBikXHCau/lpSS6EqO12WZR1QN+K1wchdVlYkseme4wEs89fyag==
+  dependencies:
+    "@glimmer/interfaces" "^0.37.1"
+    "@glimmer/runtime" "^0.37.1"
+
+"@glimmer/opcode-compiler@^0.37.1":
+  version "0.37.1"
+  resolved "https://registry.yarnpkg.com/@glimmer/opcode-compiler/-/opcode-compiler-0.37.1.tgz#e69eaa227ea85f2b6316f447617fedef58a38ca3"
+  integrity sha512-Nf6BOgcSfOUDDlExNWqjGqNUx6m6biebnMX6aEwfJwD/JrnwQuMo20/K4d8+6ZvJwqwn1Bwth9Jk3rsp7caLAw==
+  dependencies:
+    "@glimmer/encoder" "^0.37.1"
+    "@glimmer/interfaces" "^0.37.1"
+    "@glimmer/program" "^0.37.1"
+    "@glimmer/reference" "^0.37.1"
+    "@glimmer/util" "^0.37.1"
+    "@glimmer/vm" "^0.37.1"
+    "@glimmer/wire-format" "^0.37.1"
+
+"@glimmer/program@^0.37.1":
+  version "0.37.1"
+  resolved "https://registry.yarnpkg.com/@glimmer/program/-/program-0.37.1.tgz#440efc86fdc2e870dfca9c678c1986c84e8ab5dc"
+  integrity sha512-HVaF3U1bCTH7cryMccgkxHn7/IzLfy9LGbyQK0wgeiHsY+xCSBb7Kq1WP4LPUH8+84/BzEpuLJN7u2n5GGdZlw==
+  dependencies:
+    "@glimmer/encoder" "^0.37.1"
+    "@glimmer/interfaces" "^0.37.1"
+    "@glimmer/util" "^0.37.1"
+
+"@glimmer/reference@^0.37.1":
+  version "0.37.1"
+  resolved "https://registry.yarnpkg.com/@glimmer/reference/-/reference-0.37.1.tgz#a444a56eb3e79d9d6d991c423f32c6491778d57b"
+  integrity sha512-nGelUwaQ1jBnI1OH80JV3cMiWfjgsi399y61ajARiHjl1DK8gXchZ0qLpNu83Sa5UbL09AMbVaUTb8xsy6MFwA==
+  dependencies:
+    "@glimmer/util" "^0.37.1"
+
+"@glimmer/runtime@^0.37.1":
+  version "0.37.1"
+  resolved "https://registry.yarnpkg.com/@glimmer/runtime/-/runtime-0.37.1.tgz#3f690f003d00af710823449afadeaf01e379533e"
+  integrity sha512-ujkaODl2DDrwOttXZTcobH8ML4eSpgepnPpsYYEafCBXxKxkTWHV7JzSuuh3/hnHZVdrRO/vP6zIJ0P86FXBLQ==
+  dependencies:
+    "@glimmer/interfaces" "^0.37.1"
+    "@glimmer/low-level" "^0.37.1"
+    "@glimmer/program" "^0.37.1"
+    "@glimmer/reference" "^0.37.1"
+    "@glimmer/util" "^0.37.1"
+    "@glimmer/vm" "^0.37.1"
+    "@glimmer/wire-format" "^0.37.1"
     "@simple-dom/interface" "^1.4.0"
 
-"@glimmer/syntax@^0.37.0":
-  version "0.37.0"
-  resolved "https://registry.yarnpkg.com/@glimmer/syntax/-/syntax-0.37.0.tgz#3d91aef9ecad70e70654584f84552c195f3280a6"
-  integrity sha512-DTWPjTK6f7sXAYIqLjC7lfNpONyY21jmHjhzAbC6nbEfZ3DegmogWDBLCO8dhun1bAF4T2FL7+gLho698UqBiw==
+"@glimmer/syntax@^0.37.1":
+  version "0.37.1"
+  resolved "https://registry.yarnpkg.com/@glimmer/syntax/-/syntax-0.37.1.tgz#f3c507122f7c4b859ce712e0c5bbc43608ca12db"
+  integrity sha512-DtSRWrbZlgAvLOR62slBvMgUmcnYxfq4Jv5uqCqD4/DUrjV2ezmOMhDFW4zxAVz55luqx9/900XHYiUzsicPyA==
   dependencies:
-    "@glimmer/interfaces" "^0.37.0"
-    "@glimmer/util" "^0.37.0"
+    "@glimmer/interfaces" "^0.37.1"
+    "@glimmer/util" "^0.37.1"
     handlebars "^4.0.6"
     simple-html-tokenizer "^0.5.6"
 
-"@glimmer/util@^0.37.0":
-  version "0.37.0"
-  resolved "https://registry.yarnpkg.com/@glimmer/util/-/util-0.37.0.tgz#962937c187b05a8a371d5b064674e74e838411c7"
-  integrity sha512-gwApoQ4xAAPKUBd9IpKYqW3UojZv45gIH+hxi9G9BbZWQZd1f9qIUHwk6JP+bNQ4zvxv9z4QEL1pOCWLx0TE3w==
+"@glimmer/util@^0.37.1":
+  version "0.37.1"
+  resolved "https://registry.yarnpkg.com/@glimmer/util/-/util-0.37.1.tgz#b6dafd36134556053121fc8a8ffceb68e490a4b5"
+  integrity sha512-Of58Of07fsT8JOkok/tXJvewEdI6LzDxdlIIcdhv6iOJgYUsJUQKUYf6XY+5o/rtsrByPQ5da2WwHbLAcpq0aQ==
 
-"@glimmer/vm@^0.37.0":
-  version "0.37.0"
-  resolved "https://registry.yarnpkg.com/@glimmer/vm/-/vm-0.37.0.tgz#34268bb46a69e551379ccc554773e80900461c24"
-  integrity sha512-1H0Vag7kgZKJ6hCFg9Lv5OA0Q5b130atdnbKb79AS0OUpT3G7f64h/eCIlxMxhF+YhRi2nrD5Hb5bVuuD8Pszg==
+"@glimmer/vm@^0.37.1":
+  version "0.37.1"
+  resolved "https://registry.yarnpkg.com/@glimmer/vm/-/vm-0.37.1.tgz#26ad736b1228dac88fd8c1b9ce2b8ffefa91bdc0"
+  integrity sha512-EIhJoDrXX+WW3vyovTiEQSYwdbAQgaJKGR25mkMKGLSwvIu4RcX2d9uUPSkm+pBvijHNk2f67q86k1s6j8cBIQ==
   dependencies:
-    "@glimmer/interfaces" "^0.37.0"
-    "@glimmer/program" "^0.37.0"
-    "@glimmer/util" "^0.37.0"
+    "@glimmer/interfaces" "^0.37.1"
+    "@glimmer/program" "^0.37.1"
+    "@glimmer/util" "^0.37.1"
 
-"@glimmer/wire-format@^0.37.0":
-  version "0.37.0"
-  resolved "https://registry.yarnpkg.com/@glimmer/wire-format/-/wire-format-0.37.0.tgz#cd26f3d260d92a9e5d2873bd0234b54556ab3e85"
-  integrity sha512-wMBCo9cosxKzcsHuPlFzd+WHS8AqJoNYYK+LcpgLZRhjXO55oeirEQcwthV1uHdYs0CK7i+HcljuMDdJk2heww==
+"@glimmer/wire-format@^0.37.1":
+  version "0.37.1"
+  resolved "https://registry.yarnpkg.com/@glimmer/wire-format/-/wire-format-0.37.1.tgz#34906e320d38bc65b1730b5f78890b184211a0d5"
+  integrity sha512-iDj8D1eCVDmcsNUcz5epdOCN6Gt53W3cMsS2qAkf2H6REiXQ9kG7ySIGIdahNsLT/f21MT+JzqawylZR0hrw0w==
   dependencies:
-    "@glimmer/util" "^0.37.0"
+    "@glimmer/util" "^0.37.1"
 
 "@simple-dom/document@^1.4.0":
   version "1.4.0"