diff --git a/packages/gatsby-plugin-prismic-previews/package.json b/packages/gatsby-plugin-prismic-previews/package.json
index 40b53ea2..f6b4d998 100644
--- a/packages/gatsby-plugin-prismic-previews/package.json
+++ b/packages/gatsby-plugin-prismic-previews/package.json
@@ -32,7 +32,7 @@
     "prismic"
   ],
   "dependencies": {
-    "@imgix/gatsby": "^1.6.3",
+    "@imgix/gatsby": "^1.6.6",
     "@reach/dialog": "^0.15.0",
     "camel-case": "^4.1.2",
     "chalk": "^4.1.1",
diff --git a/packages/gatsby-plugin-prismic-previews/src/fieldProxies/imageFieldProxy.ts b/packages/gatsby-plugin-prismic-previews/src/fieldProxies/imageFieldProxy.ts
index fce81182..8c0bac38 100644
--- a/packages/gatsby-plugin-prismic-previews/src/fieldProxies/imageFieldProxy.ts
+++ b/packages/gatsby-plugin-prismic-previews/src/fieldProxies/imageFieldProxy.ts
@@ -3,6 +3,8 @@ import * as imgixGatsbyHelpers from '@imgix/gatsby/dist/pluginHelpers.browser'
 import * as RE from 'fp-ts/ReaderEither'
 import * as R from 'fp-ts/Record'
 import * as O from 'fp-ts/Option'
+import * as S from 'fp-ts/Semigroup'
+import * as A from 'fp-ts/Array'
 import { pipe } from 'fp-ts/function'
 
 import { ProxyDocumentSubtreeEnv } from '../lib/proxyDocumentSubtree'
@@ -49,9 +51,23 @@ const buildImageProxyValue = (
         RE.fromOption(() => new Error(sprintf('Missing height'))),
       ),
     ),
+    RE.bindW('existingImageImgixParams', (env) =>
+      pipe(
+        new URL(env.url),
+        (url) => [...url.searchParams.entries()],
+        R.fromFoldable(S.last<string>(), A.Foldable),
+        RE.right,
+      ),
+    ),
+    RE.bind('mergedImageImgixParams', (env) =>
+      RE.of({
+        ...env.existingImageImgixParams,
+        ...env.imageImgixParams,
+      }),
+    ),
     RE.bind('args', (env) =>
       RE.of({
-        imgixParams: env.imageImgixParams,
+        imgixParams: env.mergedImageImgixParams,
         placeholderImgixParams: env.imagePlaceholderImgixParams,
       }),
     ),
@@ -83,7 +99,7 @@ const buildImageProxyValue = (
             width: env.sourceWidth,
             height: env.sourceHeight,
           },
-          defaultParams: env.imageImgixParams,
+          defaultParams: env.mergedImageImgixParams,
           resolverArgs: {},
         }),
       ),
diff --git a/packages/gatsby-plugin-prismic-previews/test/usePrismicPreviewBootstrap-field-proxies.test.ts b/packages/gatsby-plugin-prismic-previews/test/usePrismicPreviewBootstrap-field-proxies.test.ts
index 52fd1fec..35ba56b8 100644
--- a/packages/gatsby-plugin-prismic-previews/test/usePrismicPreviewBootstrap-field-proxies.test.ts
+++ b/packages/gatsby-plugin-prismic-previews/test/usePrismicPreviewBootstrap-field-proxies.test.ts
@@ -20,6 +20,7 @@ import { polyfillKy } from './__testutils__/polyfillKy'
 
 import {
   PluginOptions,
+  PrismicAPIDocumentNodeInput,
   PrismicPreviewProvider,
   PrismicRepositoryConfigs,
   usePrismicPreviewBootstrap,
@@ -480,6 +481,87 @@ test.serial('image', async (t) => {
   )
 })
 
+test.serial(
+  'image retains existing URL parameters unless replaced by gatsby-plugin-image or gatsby-image',
+  async (t) => {
+    const gatsbyContext = createGatsbyContext()
+    const pluginOptions = createPluginOptions(t)
+    const config = createRepositoryConfigs(pluginOptions)
+
+    // We want to leave `rect` untouched. We're adding the `w=1` parameter to
+    // ensure that it is replaced by the resolver to properly support responsive
+    // images.
+    const originalUrl = new URL(
+      'https://example.com/image.png?rect=0,0,100,200&w=1',
+    )
+    const doc = createPrismicAPIDocument({
+      image: {
+        dimensions: { width: 400, height: 300 },
+        alt: 'alt',
+        copyright: 'copyright',
+        url: originalUrl.toString(),
+      },
+    })
+    const queryResponse = createPrismicAPIQueryResponse([doc])
+
+    const result = await performPreview(
+      t,
+      // @ts-expect-error - Partial gatsbyContext provided
+      gatsbyContext,
+      pluginOptions,
+      config,
+      queryResponse,
+      '822e45b2918cabfa88ea9d2f5600eab7.json',
+      {
+        type: gatsbyPrismic.PrismicSpecialType.Document,
+        'type.data': gatsbyPrismic.PrismicSpecialType.DocumentData,
+        'type.data.image': gatsbyPrismic.PrismicFieldType.Image,
+      },
+    )
+
+    const node = result.current.context[0].nodes[
+      doc.id
+    ] as PrismicAPIDocumentNodeInput<{
+      image: {
+        url: string
+        fixed: { src: string }
+        fluid: { src: string }
+        gatsbyImageData: { images: { fallback: { src: string } } }
+      }
+    }>
+
+    const urlUrl = new URL(node.data.image.url)
+    t.is(urlUrl.searchParams.get('rect'), originalUrl.searchParams.get('rect'))
+    t.is(urlUrl.searchParams.get('w'), originalUrl.searchParams.get('w'))
+
+    const fixedSrcUrl = new URL(node.data.image.fixed.src)
+    t.is(
+      fixedSrcUrl.searchParams.get('rect'),
+      originalUrl.searchParams.get('rect'),
+    )
+    t.not(fixedSrcUrl.searchParams.get('w'), originalUrl.searchParams.get('w'))
+
+    const fluidSrcUrl = new URL(node.data.image.fluid.src)
+    t.is(
+      fluidSrcUrl.searchParams.get('rect'),
+      originalUrl.searchParams.get('rect'),
+    )
+    t.not(fluidSrcUrl.searchParams.get('w'), originalUrl.searchParams.get('w'))
+
+    const gatsbyImageDataSrcUrl = new URL(
+      node.data.image.gatsbyImageData.images.fallback.src,
+    )
+    t.is(
+      gatsbyImageDataSrcUrl.searchParams.get('rect'),
+      originalUrl.searchParams.get('rect'),
+    )
+    t.not(
+      gatsbyImageDataSrcUrl.searchParams.get('w'),
+      originalUrl.searchParams.get('w'),
+    )
+  },
+)
+
 test.serial('group', async (t) => {
   const gatsbyContext = createGatsbyContext()
   const pluginOptions = createPluginOptions(t)
diff --git a/packages/gatsby-source-prismic/package.json b/packages/gatsby-source-prismic/package.json
index cf9c7a6c..4b77acb1 100644
--- a/packages/gatsby-source-prismic/package.json
+++ b/packages/gatsby-source-prismic/package.json
@@ -29,7 +29,7 @@
     "prismic"
   ],
   "dependencies": {
-    "@imgix/gatsby": "^1.6.3",
+    "@imgix/gatsby": "^1.6.6",
     "camel-case": "^4.1.2",
     "fp-ts": "^2.10.5",
     "gatsby-node-helpers": "^1.2.1",
diff --git a/packages/gatsby-source-prismic/src/builders/buildImageBaseFieldConfigMap.ts b/packages/gatsby-source-prismic/src/builders/buildImageBaseFieldConfigMap.ts
index 12ddbbdf..f092ec58 100644
--- a/packages/gatsby-source-prismic/src/builders/buildImageBaseFieldConfigMap.ts
+++ b/packages/gatsby-source-prismic/src/builders/buildImageBaseFieldConfigMap.ts
@@ -2,7 +2,11 @@ import * as gqlc from 'graphql-compose'
 import * as gatsbyFs from 'gatsby-source-filesystem'
 import * as imgixGatsby from '@imgix/gatsby/dist/pluginHelpers'
 import * as RTE from 'fp-ts/ReaderTaskEither'
-import { pipe } from 'fp-ts/function'
+import * as O from 'fp-ts/Option'
+import * as S from 'fp-ts/Semigroup'
+import * as A from 'fp-ts/Array'
+import * as R from 'fp-ts/Record'
+import { constNull, pipe } from 'fp-ts/function'
 
 import { Dependencies, PrismicAPIImageField } from '../types'
 
@@ -35,6 +39,65 @@ const resolveWidth = (source: PrismicAPIImageField): number | undefined =>
 const resolveHeight = (source: PrismicAPIImageField): number | undefined =>
   source.dimensions?.height
 
+/**
+ * The minimum required GraphQL argument properties for an `@imgix/gatsby` field.
+ */
+interface ImgixGatsbyFieldArgsLike {
+  imgixParams: Record<string, string | number | boolean>
+}
+
+/**
+ * Modifies an `@imgix/gatsby` GraphQL field config to retain existing Imgix
+ * parameters set on the source URL.
+ *
+ * This is needed if the source URL contains parameters like `rect` (crops an
+ * image). Without this config enhancer, the `rect` parameter would be removed.
+ *
+ * @param fieldConfig GraphQL field config object to be enhanced.
+ *
+ * @returns `fieldConfig` with the ability to retain existing Imgix parameters on the source URL.
+ */
+const withExistingURLImgixParameters = <
+  TContext,
+  TArgs extends ImgixGatsbyFieldArgsLike,
+>(
+  fieldConfig: gqlc.ObjectTypeComposerFieldConfigAsObjectDefinition<
+    PrismicAPIImageField,
+    TContext,
+    TArgs
+  >,
+): typeof fieldConfig => ({
+  ...fieldConfig,
+  resolve: (source, args, ...rest) =>
+    pipe(
+      O.Do,
+      O.bind('url', () =>
+        O.fromNullable(source.url ? new URL(source.url) : null),
+      ),
+      O.bind('existingImgixParams', (scope) =>
+        pipe(
+          [...scope.url.searchParams.entries()],
+          R.fromFoldable(S.last<string>(), A.Foldable),
+          O.of,
+        ),
+      ),
+      O.map((scope) =>
+        fieldConfig.resolve?.(
+          source,
+          {
+            ...args,
+            imgixParams: {
+              ...scope.existingImgixParams,
+              ...args.imgixParams,
+            },
+          },
+          ...rest,
+        ),
+      ),
+      O.getOrElseW(constNull),
+    ),
+})
+
 /**
  * Builds a GraphQL field configuration object to be used as part of another
  * Image field GraphQL configuration object. For example, this base
@@ -61,12 +124,20 @@ export const buildImageBaseFieldConfigMap: RTE.ReaderTaskEither<
       }),
     ),
   ),
-  RTE.bind('urlField', (scope) => RTE.right(scope.imgixTypes.fields.url)),
-  RTE.bind('fixedField', (scope) => RTE.right(scope.imgixTypes.fields.fixed)),
-  RTE.bind('fluidField', (scope) => RTE.right(scope.imgixTypes.fields.fluid)),
+  RTE.bind('urlField', (scope) =>
+    RTE.right(withExistingURLImgixParameters(scope.imgixTypes.fields.url)),
+  ),
+  RTE.bind('fixedField', (scope) =>
+    RTE.right(withExistingURLImgixParameters(scope.imgixTypes.fields.fixed)),
+  ),
+  RTE.bind('fluidField', (scope) =>
+    RTE.right(withExistingURLImgixParameters(scope.imgixTypes.fields.fluid)),
+  ),
   RTE.bind('gatsbyImageDataField', (scope) =>
     pipe(
-      RTE.right(scope.imgixTypes.fields.gatsbyImageData),
+      RTE.right(
+        withExistingURLImgixParameters(scope.imgixTypes.fields.gatsbyImageData),
+      ),
       // This field is 'JSON!' by default (i.e. non-nullable). If an image is
       // not set in Prismic, however, this field throws a GraphQL error saying a
       // non-nullable field was returned a null value. This should not happen
diff --git a/packages/gatsby-source-prismic/test/create-schema-customization-image.test.ts b/packages/gatsby-source-prismic/test/create-schema-customization-image.test.ts
index 75fe6646..5943fd3a 100644
--- a/packages/gatsby-source-prismic/test/create-schema-customization-image.test.ts
+++ b/packages/gatsby-source-prismic/test/create-schema-customization-image.test.ts
@@ -1,5 +1,7 @@
 import test from 'ava'
 import * as sinon from 'sinon'
+import * as msw from 'msw'
+import * as mswn from 'msw/node'
 
 import { createGatsbyContext } from './__testutils__/createGatsbyContext'
 import { createPluginOptions } from './__testutils__/createPluginOptions'
@@ -242,3 +244,107 @@ test('thumbnail field resolves thumbnails', async (t) => {
 
   t.true(res.mobile === field.mobile)
 })
+
+test('existing image URL parameters are persisted unless replaced in gatsby-plugin-image and gatsby-image fields', async (t) => {
+  const gatsbyContext = createGatsbyContext()
+  const pluginOptions = createPluginOptions(t)
+
+  pluginOptions.schemas = {
+    foo: {
+      Main: {
+        image: { type: PrismicFieldType.Image, config: {} },
+      },
+    },
+  }
+
+  // @ts-expect-error - Partial gatsbyContext provided
+  await createSchemaCustomization(gatsbyContext, pluginOptions)
+
+  const call = findCreateTypesCall(
+    'PrismicPrefixFooDataImageImageType',
+    gatsbyContext.actions.createTypes as sinon.SinonStub,
+  )
+  // We'll override the `sat` parameter, but leave `rect` untouched.
+  // We're adding the `w=1` parameter to ensure that it is replaced by the
+  // resolver to properly support responsive images.
+  const originalUrl = new URL(
+    'https://example.com/image.png?rect=0,0,100,200&sat=100&w=1',
+  )
+  const field = { url: originalUrl.toString() }
+  const imgixParams = { sat: 50 }
+
+  const server = mswn.setupServer(
+    msw.rest.get(
+      `${originalUrl.origin}${originalUrl.pathname}`,
+      (req, res, ctx) => {
+        const params = req.url.searchParams
+
+        if (params.get('fm') === 'json') {
+          return res(
+            ctx.json({
+              'Content-Type': 'image/png',
+              PixelWidth: 200,
+              PixelHeight: 100,
+            }),
+          )
+        } else {
+          t.fail(
+            'Forcing a failure due to an unhandled request for Imgix image metadata',
+          )
+
+          return
+        }
+      },
+    ),
+  )
+  server.listen({ onUnhandledRequest: 'error' })
+  t.teardown(() => {
+    server.close()
+  })
+
+  const urlRes = await call.config.fields.url.resolve(field, { imgixParams })
+  const urlUrl = new URL(urlRes)
+  t.is(urlUrl.searchParams.get('sat'), imgixParams.sat.toString())
+  t.is(urlUrl.searchParams.get('rect'), originalUrl.searchParams.get('rect'))
+  t.is(urlUrl.searchParams.get('w'), originalUrl.searchParams.get('w'))
+
+  const fixedRes = await call.config.fields.fixed.resolve(field, {
+    imgixParams,
+  })
+  const fixedSrcUrl = new URL(fixedRes.src)
+  t.is(fixedSrcUrl.searchParams.get('sat'), imgixParams.sat.toString())
+  t.is(
+    fixedSrcUrl.searchParams.get('rect'),
+    originalUrl.searchParams.get('rect'),
+  )
+  t.not(fixedSrcUrl.searchParams.get('w'), originalUrl.searchParams.get('w'))
+
+  const fluidRes = await call.config.fields.fluid.resolve(field, {
+    imgixParams,
+  })
+  const fluidSrcUrl = new URL(fluidRes.src)
+  t.is(fluidSrcUrl.searchParams.get('sat'), imgixParams.sat.toString())
+  t.is(
+    fluidSrcUrl.searchParams.get('rect'),
+    originalUrl.searchParams.get('rect'),
+  )
+  t.not(fluidSrcUrl.searchParams.get('w'), originalUrl.searchParams.get('w'))
+
+  const gatsbyImageDataRes = await call.config.fields.gatsbyImageData.resolve(
+    field,
+    { imgixParams },
+  )
+  const gatsbyImageDataSrcUrl = new URL(gatsbyImageDataRes.images.fallback.src)
+  t.is(
+    gatsbyImageDataSrcUrl.searchParams.get('sat'),
+    imgixParams.sat.toString(),
+  )
+  t.is(
+    gatsbyImageDataSrcUrl.searchParams.get('rect'),
+    originalUrl.searchParams.get('rect'),
+  )
+  t.not(
+    gatsbyImageDataSrcUrl.searchParams.get('w'),
+    originalUrl.searchParams.get('w'),
+  )
+})
diff --git a/tsconfig.json b/tsconfig.json
index f3284106..152a2191 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -2,7 +2,7 @@
   "compilerOptions": {
     "module": "CommonJS",
     "target": "ESNext",
-    "lib": ["DOM", "ESNext"],
+    "lib": ["DOM", "DOM.Iterable", "ESNext"],
     "importHelpers": true,
     "sourceMap": true,
     "strict": true,
diff --git a/yarn.lock b/yarn.lock
index 3ae65e61..38e4e15d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1647,10 +1647,10 @@
   resolved "https://registry.yarnpkg.com/@iarna/toml/-/toml-2.2.5.tgz#b32366c89b43c6f8cefbdefac778b9c828e3ba8c"
   integrity sha512-trnsAYxU3xnS1gPHPyU961coFyLkh4gAD/0zQ5mymY4yOZ+CYvsPqUbOFSw0aDM4y0tV7tiFxL/1XfXPNC6IPg==
 
-"@imgix/gatsby@^1.6.3":
-  version "1.6.3"
-  resolved "https://registry.yarnpkg.com/@imgix/gatsby/-/gatsby-1.6.3.tgz#d8ae1032767d7aa3488032b63f5492fb8cca8901"
-  integrity sha512-ueK0RK58M/66Z1pCM6UmRleBFshGJRkQmaNjYxGs5C1cQ8rrnEL5Lg8pNf0d2Vr2EuFhvgnI3x4FVRozXuMVGg==
+"@imgix/gatsby@^1.6.6":
+  version "1.6.6"
+  resolved "https://registry.yarnpkg.com/@imgix/gatsby/-/gatsby-1.6.6.tgz#c38abf35cd39b22f53cc020e6c471b0d382e9782"
+  integrity sha512-bngboBzagVgEfDieJBrSRoyLMVqXm4rOh0tAJINdGdNF2bc6v1YO03JV2FZtM9ueo1UOI+lBLeb5zUJ0qAobNg==
   dependencies:
     "@imgix/js-core" "3.1.3"
     camel-case "^4.1.2"