diff --git a/lib/astFromSchema/index.test.js b/lib/astFromSchema/index.test.js
index 08924d6..8133538 100644
--- a/lib/astFromSchema/index.test.js
+++ b/lib/astFromSchema/index.test.js
@@ -96,8 +96,7 @@ type Query {
   getStuff: Stuff
 }
 
-union Something = Bar | Baz | Foo
-`
+union Something = Bar | Baz | Foo`
   // Compare printed ASTs so tap doesn't timeout comparing DocumentNodes.
   equal(print(actual), expected)
 })
@@ -118,8 +117,7 @@ type Foo {
 
 type Query {
   getFoo(bar: String = "bar"): Foo @testing
-}
-`
+}`
   // Compare printed ASTs so tap doesn't timeout comparing DocumentNodes.
   equal(print(actual), expected)
 })
@@ -146,8 +144,7 @@ type Foo {
 
 type Query {
   getFoo(bar: String = "bar"): Foo @testing
-}
-`
+}`
   // Compare printed ASTs so tap doesn't timeout comparing DocumentNodes.
   equal(print(actual), expected)
 })
@@ -188,8 +185,8 @@ type Query {
   getStuff: Stuff
 }
 
-union Something = Bar | Baz | Foo
-`
+union Something = Bar | Baz | Foo`
+
   // Compare printed ASTs so tap doesn't timeout comparing DocumentNodes.
   equal(print(actual), expected)
 })
@@ -245,8 +242,8 @@ type Query {
   getStuff: Stuff
 }
 
-union Something = Bar | Baz | Foo
-`
+union Something = Bar | Baz | Foo`
+
   // Compare printed ASTs so tap doesn't timeout comparing DocumentNodes.
   equal(print(actual), expected)
 })
diff --git a/lib/normalizeGQLSource/index.test.js b/lib/normalizeGQLSource/index.test.js
index ea4c3f5..385bf1d 100644
--- a/lib/normalizeGQLSource/index.test.js
+++ b/lib/normalizeGQLSource/index.test.js
@@ -186,8 +186,7 @@ union Friend = Human | Zebra
 extend type Query {
   friend(humanID: ID, zebraID: ID): Friend
   friendsOf(humanID: ID, zebraID: ID): [Friend] @awesome @paginate
-}
-`
+}`
 
 test(
   'should group top-level declarations by kind and then alphabetize them along with their fields, directives, arguments, values, types, interfaces, and locations by name.',
diff --git a/lib/printSDL/index.test.js b/lib/printSDL/index.test.js
index 3e007b8..abf2815 100644
--- a/lib/printSDL/index.test.js
+++ b/lib/printSDL/index.test.js
@@ -6,8 +6,7 @@ const source = `directive @testing on FIELD_DEFINITION
 
 type Query {
   foo: String! @testing
-}
-`
+}`
 
 test('printSDL - given a GraphQLSchema and no opts, should return a normalized SDL string', async ({ equal }) => {
   const schema = buildSchema(source)
diff --git a/package.json b/package.json
index 43bb8e0..d7b252c 100644
--- a/package.json
+++ b/package.json
@@ -31,12 +31,12 @@
   },
   "homepage": "https://github.com/autotelic/graphql-schema-tools#readme",
   "devDependencies": {
-    "@graphql-tools/stitch": "^7.5.3",
-    "graphql": "^15.5.0",
+    "@graphql-tools/stitch": "^8.6.9",
+    "graphql": "^16.4.0",
     "standard": "^16.0.3",
-    "tap": "^15.0.9"
+    "tap": "^16.0.0"
   },
   "peerDependencies": {
-    "graphql": "^14.0.0 || ^15.0.0"
+    "graphql": "^14.0.0 || ^15.0.0 || ^16.0.0"
   }
 }