diff --git a/.github/workflows/httr2-min-version-check.yaml b/.github/workflows/httr2-min-version-check.yaml
new file mode 100644
index 0000000..2609990
--- /dev/null
+++ b/.github/workflows/httr2-min-version-check.yaml
@@ -0,0 +1,38 @@
+# Workflow derived from https://github.com/r-lib/actions/tree/v2/examples
+on:
+  push:
+    branches: main
+  pull_request:
+
+name: httr2 minimum version support check
+
+jobs:
+  httr2-version-check:
+    runs-on: ubuntu-latest
+
+    env:
+      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+      R_KEEP_PKG_SOURCE: yes
+      _R_CHECK_TESTS_NLINES_: 0
+
+    steps:
+      - uses: actions/checkout@v6
+
+      - uses: r-lib/actions/setup-pandoc@v2
+
+      - uses: r-lib/actions/setup-r@v2
+
+      - uses: actions/checkout@v6
+        with:
+          r-version: release
+          use-public-rspm: true
+
+      - uses: r-lib/actions/setup-r-dependencies@v2
+        with:
+          extra-packages: any::rcmdcheck any::httr2@1.0.0
+          needs: check
+
+      - uses: r-lib/actions/check-r-package@v2
+        with:
+          upload-snapshots: true
+          build_args: 'c("--no-manual","--compact-vignettes=gs+qpdf")'
diff --git a/.gitignore b/.gitignore
index a29be13..e834b5a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,4 @@ inst/doc/*.html
 *.Rproj
 revdep/
 docs/
+tests/testthat/127.0.0.1-*
diff --git a/DESCRIPTION b/DESCRIPTION
index 7c037db..eab2122 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -20,7 +20,7 @@ BugReports: https://github.com/nealrichardson/httptest2/issues
 License: MIT + file LICENSE
 Imports:
     digest,
-    httr2 (>= 0.2.0),
+    httr2 (>= 1.0.0),
     jsonlite,
     rlang,
     stats,
diff --git a/NEWS.md b/NEWS.md
index 9dd1434..f4cac24 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,6 +1,7 @@
 # httptest2 (development version)
 
 * Reloaded mocked response objects now include the request that caused them to be loaded as `$request` (#65, @jonthegeek)
+* httptest2 now requires httr2 v1.0.0 or higher (@jonthegeek)
 
 # httptest2 1.2.2
 
diff --git a/R/expect-request-header.R b/R/expect-request-header.R
index 7829ff5..76604f4 100644
--- a/R/expect-request-header.R
+++ b/R/expect-request-header.R
@@ -16,6 +16,7 @@
 #' @return The value of `expr` if there are no expectation failures
 #' @importFrom testthat expect_null expect_match
 #' @importFrom rlang is_string
+#' @importFrom httr2 with_mocked_response
 #' @examplesIf FALSE
 #'
 #' library(httr2)
@@ -86,11 +87,3 @@ expect_request_header <- function(
 
   with_mocked_responses(header_mocker, expr)
 }
-
-with_mocked_responses <- function(mock, code) {
-  if (httr2_1.0.0) {
-    utils::getFromNamespace("with_mocked_responses", "httr2")(mock, code)
-  } else {
-    utils::getFromNamespace("with_mock", "httr2")(mock, code)
-  }
-}
diff --git a/R/zzz.R b/R/zzz.R
deleted file mode 100644
index 40ef252..0000000
--- a/R/zzz.R
+++ /dev/null
@@ -1,6 +0,0 @@
-httr2_1.0.0 <- NULL
-
-.onLoad <- function(...) {
-  # packageVersion() can be slow, so let's only do this check once
-  httr2_1.0.0 <<- utils::packageVersion("httr2") > "0.2.3"
-}
diff --git a/tests/testthat/test-mock-api.R b/tests/testthat/test-mock-api.R
index 6181b24..3deaa16 100644
--- a/tests/testthat/test-mock-api.R
+++ b/tests/testthat/test-mock-api.R
@@ -224,11 +224,11 @@ with_mock_api({
     req$policies$example <- "example policy"
     a <- req %>% req_perform()
     expect_identical(
-      httr2::resp_request(a),
+      a$request,
       req
     )
     expect_identical(
-      httr2::resp_request(a)$policies$example,
+      a$request$policies$example,
       "example policy"
     )
   })