diff --git a/CHANGELOG.md b/CHANGELOG.md
index 603b222..97244f9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## major.minor.patch (yyyy.mm.dd)
 
+### Fixed
+
+* Do not attach a body to bodyless requests. `encode_body/1` serialized a nil body to the literal `"null"`, so every GET/DELETE carried a JSON body. Older HTTP clients dropped it, but Req >= 0.7 transmits it and Typesense returns 404 for a GET-with-body (e.g. `get_collection` on `/collections/:name`), breaking collection existence checks and reindexing.
+
 ## 1.3.5 (2026.06.09)
 
 ### Chore
diff --git a/lib/open_api_typesense/client.ex b/lib/open_api_typesense/client.ex
index 7488ec1..aa7c757 100644
--- a/lib/open_api_typesense/client.ex
+++ b/lib/open_api_typesense/client.ex
@@ -123,6 +123,14 @@ defmodule OpenApiTypesense.Client do
       |> scrub_data()
 
     case {opts[:request], body} do
+      # No request-body spec and no body (e.g. GET/DELETE) — send no body at all.
+      # Encoding `nil` to the literal "null" makes bodyless requests carry a JSON body, which
+      # older HTTP clients silently dropped but Req >= 0.7 transmits. Typesense then returns 404
+      # for a GET-with-body on routes like `/collections/:name`, so `get_collection` cannot see a
+      # collection that exists. Returning nil lets Req omit the body.
+      {nil, nil} ->
+        nil
+
       {nil, _} ->
         Jason.encode_to_iodata!(body)
 
diff --git a/mix.lock b/mix.lock
index e192de5..c4e3477 100644
--- a/mix.lock
+++ b/mix.lock
@@ -9,13 +9,13 @@
   "file_system": {:hex, :file_system, "1.1.1", "31864f4685b0148f25bd3fbef2b1228457c0c89024ad67f7a81a3ffbc0bbad3a", [:mix], [], "hexpm", "7a15ff97dfe526aeefb090a7a9d3d03aa907e100e262a0f8f7746b78f8f87a5d"},
   "finch": {:hex, :finch, "0.22.0", "5c48fa6f9706a78eb9036cacb67b8b996b4e66d111c543f4c29bb0f879a6806b", [:mix], [{:mime, "~> 1.0 or ~> 2.0", [hex: :mime, repo: "hexpm", optional: false]}, {:mint, "~> 1.8", [hex: :mint, repo: "hexpm", optional: false]}, {:nimble_options, "~> 0.4 or ~> 1.0", [hex: :nimble_options, repo: "hexpm", optional: false]}, {:nimble_pool, "~> 1.1", [hex: :nimble_pool, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "b94e83c47780fc6813f746a1f1a34ee65cda42da4c5ea26a68f0acc4498e23dc"},
   "fork_poison": {:hex, :fork_poison, "6.0.2", "20e6ac046b5cfdd5021798679cd8daa28fcbc00d122a56e57b9dcf74f19e2081", [:mix], [{:decimal, "~> 3.1", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "0a8efe62f9391efc5c8da419e8bdedf89cd3db2744061fde2e0ede28d3da7832"},
-  "hpax": {:hex, :hpax, "1.0.3", "ed67ef51ad4df91e75cc6a1494f851850c0bd98ebc0be6e81b026e765ee535aa", [:mix], [], "hexpm", "8eab6e1cfa8d5918c2ce4ba43588e894af35dbd8e91e6e55c817bca5847df34a"},
+  "hpax": {:hex, :hpax, "1.0.4", "777de5d433b0fbdc7c418159c8055910faa8047ffdb3d6b31098d2a46cd7685c", [:mix], [], "hexpm", "afc7cb142ebcc2d01ce7816190b98ce5dd49e799111b24249f3443d730f377ca"},
   "jason": {:hex, :jason, "1.4.5", "2e3a008590b0b8d7388c20293e9dcc9cf3e5d642fd2a114e4cbbb52e595d940a", [:mix], [{:decimal, "~> 1.0 or ~> 2.0 or ~> 3.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "b0c823996102bcd0239b3c2444eb00409b72f6a140c1950bc8b457d836b30684"},
   "makeup": {:hex, :makeup, "1.2.1", "e90ac1c65589ef354378def3ba19d401e739ee7ee06fb47f94c687016e3713d1", [:mix], [{:nimble_parsec, "~> 1.4", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "d36484867b0bae0fea568d10131197a4c2e47056a6fbe84922bf6ba71c8d17ce"},
   "makeup_elixir": {:hex, :makeup_elixir, "1.0.1", "e928a4f984e795e41e3abd27bfc09f51db16ab8ba1aebdba2b3a575437efafc2", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.2.3 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "7284900d412a3e5cfd97fdaed4f5ed389b8f2b4cb49efc0eb3bd10e2febf9507"},
   "makeup_erlang": {:hex, :makeup_erlang, "1.1.0", "835f7e60792e08824cda445639555d7bf1bbbddb1b60b306e33cb6f6db24dc74", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}], "hexpm", "1cd6780fb1dd1a03979abaed0fe82712b0625118fd5257d3ebbf73f960c73c3c"},
   "mime": {:hex, :mime, "2.0.7", "b8d739037be7cd402aee1ba0306edfdef982687ee7e9859bee6198c1e7e2f128", [:mix], [], "hexpm", "6171188e399ee16023ffc5b76ce445eb6d9672e2e241d2df6050f3c771e80ccd"},
-  "mint": {:hex, :mint, "1.9.0", "d6f534c2a3e98b2a8cc749b4796eb77e9e3af79a76f96e4c74035a827de0d318", [:mix], [{:castore, "~> 0.1.0 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:hpax, "~> 0.1.1 or ~> 0.2.0 or ~> 1.0", [hex: :hpax, repo: "hexpm", optional: false]}], "hexpm", "007154c7d8c43916aed3c93afd1f11aebbaa9c5ff4b7ba55ebe0d17ee0296042"},
+  "mint": {:hex, :mint, "1.9.3", "3337184d69179695c7a9f1714d92c11e629d36c8c037a21cf490131d3d150554", [:mix], [{:castore, "~> 0.1.0 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:hpax, "~> 0.1.1 or ~> 0.2.0 or ~> 1.0", [hex: :hpax, repo: "hexpm", optional: false]}], "hexpm", "5f7c9342480c069dbbc4eeac3490303c9e01870ff01a7f1d29b6107054fc1e74"},
   "mix_audit": {:hex, :mix_audit, "2.1.5", "c0f77cee6b4ef9d97e37772359a187a166c7a1e0e08b50edf5bf6959dfe5a016", [:make, :mix], [{:jason, "~> 1.4", [hex: :jason, repo: "hexpm", optional: false]}, {:yaml_elixir, "~> 2.11", [hex: :yaml_elixir, repo: "hexpm", optional: false]}], "hexpm", "87f9298e21da32f697af535475860dc1d3617a010e0b418d2ec6142bc8b42d69"},
   "nimble_options": {:hex, :nimble_options, "1.1.1", "e3a492d54d85fc3fd7c5baf411d9d2852922f66e69476317787a7b2bb000a61b", [:mix], [], "hexpm", "821b2470ca9442c4b6984882fe9bb0389371b8ddec4d45a9504f00a66f650b44"},
   "nimble_parsec": {:hex, :nimble_parsec, "1.4.2", "8efba0122db06df95bfaa78f791344a89352ba04baedd3849593bfce4d0dc1c6", [:mix], [], "hexpm", "4b21398942dda052b403bbe1da991ccd03a053668d147d53fb8c4e0efe09c973"},
diff --git a/test/default_client_test.exs b/test/default_client_test.exs
index 658f7b1..7ea624d 100644
--- a/test/default_client_test.exs
+++ b/test/default_client_test.exs
@@ -57,6 +57,23 @@ defmodule DefaultClientTest do
                max_retries: 0
              }
     end
+
+    @tag [
+      "30.1": true,
+      "30.0": true,
+      "29.0": true,
+      "28.0": true,
+      "27.1": true,
+      "27.0": true,
+      "26.0": true
+    ]
+    test "does not attach a body to bodyless requests" do
+      # A GET/DELETE with no body must not carry the literal "null" — Req >= 0.7 transmits it and
+      # Typesense 404s a GET-with-body (e.g. get_collection). See encode_body/1.
+      req = Client.build_req_client(Connection.new(), url: "/collections/foo", method: :get)
+
+      assert req.body == nil
+    end
   end
 
   @tag [