diff --git a/.Rbuildignore b/.Rbuildignore
index 1961791..d0dcb57 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -13,3 +13,4 @@
 ^pkgdown$
 ^pkgdown.sh$
 ^\.github$
+^httptest2\.Rproj$
diff --git a/R/capture-requests.R b/R/capture-requests.R
index 2b2f32f..82e2953 100644
--- a/R/capture-requests.R
+++ b/R/capture-requests.R
@@ -164,6 +164,8 @@ save_response <- function(response, file, simplify = TRUE) {
         class = "httr2_path"
       ))
     }
+    # Needed for httr2 1.0.0
+    response$cache <- quote(new.env(parent = emptyenv()))
 
     f <- file(dst_file, "wb", encoding = "UTF-8")
     on.exit(close(f))
diff --git a/R/expect-request-header.R b/R/expect-request-header.R
index 1cc5965..8c9e055 100644
--- a/R/expect-request-header.R
+++ b/R/expect-request-header.R
@@ -82,5 +82,13 @@ expect_request_header <- function(expr,
     }
   }
 
-  httr2::with_mock(header_mocker, expr)
+  with_mock(header_mocker, expr)
+}
+
+with_mock <- function(mock, code) {
+  if (httr2_1.0.0) {
+    getFromNamespace("with_mocked_responses", "httr2")(mock, code)
+  } else {
+    httr2::with_mock(mock, code)
+  }
 }
diff --git a/R/mock-api.R b/R/mock-api.R
index ac459ea..213601c 100644
--- a/R/mock-api.R
+++ b/R/mock-api.R
@@ -138,6 +138,9 @@ load_response <- function(file, req) {
 }
 
 adapt_httr_response <- function(resp) {
+  # Restore httr2 1.0.0 cache
+  resp$cache <- new.env(parent = emptyenv())
+  
   if (inherits(resp, "httr2_response")) {
     return(resp)
   }
diff --git a/R/without-internet.R b/R/without-internet.R
index 1e2e0a1..8007ab8 100644
--- a/R/without-internet.R
+++ b/R/without-internet.R
@@ -32,7 +32,7 @@
 #'   )
 #' })
 #' @export
-without_internet <- function(expr) httr2::with_mock(stop_request, expr)
+without_internet <- function(expr) with_mock(stop_request, expr)
 
 #' @rdname without_internet
 #' @export
diff --git a/R/zzz.R b/R/zzz.R
new file mode 100644
index 0000000..40ef252
--- /dev/null
+++ b/R/zzz.R
@@ -0,0 +1,6 @@
+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-capture-requests.R b/tests/testthat/test-capture-requests.R
index 4a876a2..3b94419 100644
--- a/tests/testthat/test-capture-requests.R
+++ b/tests/testthat/test-capture-requests.R
@@ -222,7 +222,7 @@ with_mock_api({
 
 test_that("If the httr2 request function exits with an error, capture_requests warns", {
   capture_requests({
-    httr2::with_mock(
+    with_mock(
       function(req) stop("Error!"),
       expect_warning(
         expect_error(
diff --git a/tests/testthat/test-mock-api.R b/tests/testthat/test-mock-api.R
index 7d46b00..ba7edaf 100644
--- a/tests/testthat/test-mock-api.R
+++ b/tests/testthat/test-mock-api.R
@@ -25,7 +25,7 @@ with_mock_api({
       request("api/NOTAFILE/") %>%
         req_url_query(a = 1) %>%
         req_perform(),
-      "api/NOTAFILE/?a=1"
+      if (httr2_1.0.0) "/api/NOTAFILE/?a=1" else "api/NOTAFILE/?a=1"
     )
   })
   test_that("POST method reads from correct file", {