diff --git a/config/config.exs b/config/config.exs
index ba77d8b02..f586e3883 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -487,8 +487,7 @@ config :pleroma, Pleroma.Web.Preload,
 config :pleroma, :http_security,
   enabled: true,
   sts: false,
-  sts_max_age: 31_536_000,
-  ct_max_age: 2_592_000,
+  sts_max_age: 63_072_000,
   referrer_policy: "same-origin"
 
 config :cors_plug,
diff --git a/config/description.exs b/config/description.exs
index 287abb747..b605bbd19 100644
--- a/config/description.exs
+++ b/config/description.exs
@@ -1750,14 +1750,7 @@ config :pleroma, :config_description, [
         label: "STS max age",
         type: :integer,
         description: "The maximum age for the Strict-Transport-Security header if sent",
-        suggestions: [31_536_000]
-      },
-      %{
-        key: :ct_max_age,
-        label: "CT max age",
-        type: :integer,
-        description: "The maximum age for the Expect-CT header if sent",
-        suggestions: [2_592_000]
+        suggestions: [63_072_000]
       },
       %{
         key: :referrer_policy,
diff --git a/docs/docs/configuration/cheatsheet.md b/docs/docs/configuration/cheatsheet.md
index 49c37147d..ee35d95bc 100644
--- a/docs/docs/configuration/cheatsheet.md
+++ b/docs/docs/configuration/cheatsheet.md
@@ -453,7 +453,6 @@ This will make Akkoma listen on `127.0.0.1` port `8080` and generate urls starti
 * ``enabled``: Whether the managed content security policy is enabled.
 * ``sts``: Whether to additionally send a `Strict-Transport-Security` header.
 * ``sts_max_age``: The maximum age for the `Strict-Transport-Security` header if sent.
-* ``ct_max_age``: The maximum age for the `Expect-CT` header if sent.
 * ``referrer_policy``: The referrer policy to use, either `"same-origin"` or `"no-referrer"`.
 * ``report_uri``: Adds the specified url to `report-uri` and `report-to` group in CSP header.
 
diff --git a/docs/docs/configuration/hardening.md b/docs/docs/configuration/hardening.md
index 3011812fc..c5a9e160b 100644
--- a/docs/docs/configuration/hardening.md
+++ b/docs/docs/configuration/hardening.md
@@ -27,14 +27,13 @@ This will send additional HTTP security headers to the clients, including:
 * `X-Permitted-Cross-Domain-Policies: "none"`
 * `X-Frame-Options: "DENY"`
 * `X-Content-Type-Options: "nosniff"`
-* `X-Download-Options: "noopen"`
 
 A content security policy (CSP) will also be set:
 
 ```csp
 content-security-policy:
   default-src 'none';
-  base-uri 'self';
+  base-uri 'none';
   frame-ancestors 'none';
   img-src 'self' data: blob: https:;
   media-src 'self' https:;
@@ -52,10 +51,6 @@ content-security-policy:
 
 An additional “Strict transport security” header will be sent with the configured `sts_max_age` parameter. This tells the browser, that the domain should only be accessed over a secure HTTPs connection.
 
-#### `ct_max_age`
-
-An additional “Expect-CT” header will be sent with the configured `ct_max_age` parameter. This enforces the use of TLS certificates that are published in the certificate transparency log. (see [Expect-CT](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Expect-CT))
-
 #### `referrer_policy`
 
 > Recommended value: `same-origin`
diff --git a/docs/docs/configuration/i2p.md b/docs/docs/configuration/i2p.md
index 981593366..ec6266ab7 100644
--- a/docs/docs/configuration/i2p.md
+++ b/docs/docs/configuration/i2p.md
@@ -160,7 +160,6 @@ server {
         add_header X-Frame-Options DENY;
         add_header X-Content-Type-Options nosniff;
         add_header Referrer-Policy same-origin;
-        add_header X-Download-Options noopen;
 
         proxy_http_version 1.1;
         proxy_set_header Upgrade $http_upgrade;
diff --git a/docs/docs/configuration/onion_federation.md b/docs/docs/configuration/onion_federation.md
index 9fc1cef06..e4ae15fd2 100644
--- a/docs/docs/configuration/onion_federation.md
+++ b/docs/docs/configuration/onion_federation.md
@@ -104,7 +104,6 @@ server {
         add_header X-Frame-Options DENY;
         add_header X-Content-Type-Options nosniff;
         add_header Referrer-Policy same-origin;
-        add_header X-Download-Options noopen;
 
         proxy_http_version 1.1;
         proxy_set_header Upgrade $http_upgrade;
diff --git a/docs/docs/installation/openbsd_en.md b/docs/docs/installation/openbsd_en.md
index 2b163df6d..9693467f2 100644
--- a/docs/docs/installation/openbsd_en.md
+++ b/docs/docs/installation/openbsd_en.md
@@ -165,10 +165,9 @@ http protocol plerup { # Protocol for upstream akkoma server
 	match response header append "X-Frame-Options" value "DENY"
 	match response header append "X-Content-Type-Options" value "nosniff"
 	match response header append "Referrer-Policy" value "same-origin"
-	match response header append "X-Download-Options" value "noopen"
-	match response header append "Content-Security-Policy" value "default-src 'none'; base-uri 'self'; form-action 'self'; img-src 'self' data: https:; media-src 'self' https:; style-src 'self' 'unsafe-inline'; font-src 'self'; script-src 'self'; connect-src 'self' wss://CHANGEME.tld; upgrade-insecure-requests;" # Modify "CHANGEME.tld" and set your instance's domain here
+	match response header append "Content-Security-Policy" value "default-src 'none'; base-uri 'none'; form-action 'self'; img-src 'self' data: https:; media-src 'self' https:; style-src 'self' 'unsafe-inline'; font-src 'self'; script-src 'self'; connect-src 'self' wss://CHANGEME.tld; upgrade-insecure-requests;" # Modify "CHANGEME.tld" and set your instance's domain here
 	match request header append "Connection" value "upgrade"
-	#match response header append "Strict-Transport-Security" value "max-age=31536000; includeSubDomains" # Uncomment this only after you get HTTPS working.
+	#match response header append "Strict-Transport-Security" value "max-age=63072000; includeSubDomains; preload" # Uncomment this only after you get HTTPS working.
 
 	# If you do not want remote frontends to be able to access your Akkoma backend server, comment these lines
 	match response header append "Access-Control-Allow-Origin" value "*"
diff --git a/lib/pleroma/web/plugs/http_security_plug.ex b/lib/pleroma/web/plugs/http_security_plug.ex
index 5f36b77d1..47874a980 100644
--- a/lib/pleroma/web/plugs/http_security_plug.ex
+++ b/lib/pleroma/web/plugs/http_security_plug.ex
@@ -47,7 +47,6 @@ defmodule Pleroma.Web.Plugs.HTTPSecurityPlug do
       {"x-frame-options", "DENY"},
       {"x-content-type-options", "nosniff"},
       {"referrer-policy", referrer_policy},
-      {"x-download-options", "noopen"},
       {"content-security-policy", csp_string()},
       {"permissions-policy", "interest-cohort=()"}
     ]
@@ -76,7 +75,7 @@ defmodule Pleroma.Web.Plugs.HTTPSecurityPlug do
 
   static_csp_rules = [
     "default-src 'none'",
-    "base-uri 'self'",
+    "base-uri 'none'",
     "frame-ancestors 'none'",
     "style-src 'self' 'unsafe-inline'",
     "font-src 'self'",
@@ -237,11 +236,9 @@ your instance and your users via malicious posts:
 
   defp maybe_send_sts_header(conn, true) do
     max_age_sts = Config.get([:http_security, :sts_max_age])
-    max_age_ct = Config.get([:http_security, :ct_max_age])
 
     merge_resp_headers(conn, [
-      {"strict-transport-security", "max-age=#{max_age_sts}; includeSubDomains"},
-      {"expect-ct", "enforce, max-age=#{max_age_ct}"}
+      {"strict-transport-security", "max-age=#{max_age_sts}; includeSubDomains; preload"}
     ])
   end
 
diff --git a/priv/gettext/ca/LC_MESSAGES/config_descriptions.po b/priv/gettext/ca/LC_MESSAGES/config_descriptions.po
index 3a25f067e..ad2177a9b 100644
--- a/priv/gettext/ca/LC_MESSAGES/config_descriptions.po
+++ b/priv/gettext/ca/LC_MESSAGES/config_descriptions.po
@@ -1936,12 +1936,6 @@ msgstr ""
 "What user agent to use. Must be a string or an atom `:default`. Default "
 "value is `:default`."
 
-#: lib/pleroma/docs/translator.ex:5
-#, fuzzy
-msgctxt "config description at :pleroma-:http_security > :ct_max_age"
-msgid "The maximum age for the Expect-CT header if sent"
-msgstr "The maximum age for the Expect-CT header if sent"
-
 #: lib/pleroma/docs/translator.ex:5
 #, fuzzy
 msgctxt "config description at :pleroma-:http_security > :enabled"
@@ -4993,12 +4987,6 @@ msgctxt "config label at :pleroma-:http > :user_agent"
 msgid "User agent"
 msgstr "User agent"
 
-#: lib/pleroma/docs/translator.ex:5
-#, fuzzy
-msgctxt "config label at :pleroma-:http_security > :ct_max_age"
-msgid "CT max age"
-msgstr "CT max age"
-
 #: lib/pleroma/docs/translator.ex:5
 #, fuzzy
 msgctxt "config label at :pleroma-:http_security > :enabled"
diff --git a/priv/gettext/config_descriptions.pot b/priv/gettext/config_descriptions.pot
index 9021fbfab..1a55bfe68 100644
--- a/priv/gettext/config_descriptions.pot
+++ b/priv/gettext/config_descriptions.pot
@@ -1612,12 +1612,6 @@ msgctxt "config description at :pleroma-:http > :user_agent"
 msgid "What user agent to use. Must be a string or an atom `:default`. Default value is `:default`."
 msgstr ""
 
-#, elixir-autogen, elixir-format
-#: lib/pleroma/docs/translator.ex:5
-msgctxt "config description at :pleroma-:http_security > :ct_max_age"
-msgid "The maximum age for the Expect-CT header if sent"
-msgstr ""
-
 #, elixir-autogen, elixir-format
 #: lib/pleroma/docs/translator.ex:5
 msgctxt "config description at :pleroma-:http_security > :enabled"
@@ -4048,12 +4042,6 @@ msgctxt "config label at :pleroma-:http > :user_agent"
 msgid "User agent"
 msgstr ""
 
-#, elixir-autogen, elixir-format
-#: lib/pleroma/docs/translator.ex:5
-msgctxt "config label at :pleroma-:http_security > :ct_max_age"
-msgid "CT max age"
-msgstr ""
-
 #, elixir-autogen, elixir-format
 #: lib/pleroma/docs/translator.ex:5
 msgctxt "config label at :pleroma-:http_security > :enabled"
diff --git a/priv/gettext/es/LC_MESSAGES/config_descriptions.po b/priv/gettext/es/LC_MESSAGES/config_descriptions.po
index 9c1acae20..f3602ce46 100644
--- a/priv/gettext/es/LC_MESSAGES/config_descriptions.po
+++ b/priv/gettext/es/LC_MESSAGES/config_descriptions.po
@@ -1759,12 +1759,6 @@ msgstr ""
 "What user agent to use. Must be a string or an atom `:default`. Default "
 "value is `:default`."
 
-#: lib/pleroma/docs/translator.ex:5
-#, elixir-autogen, elixir-format, fuzzy
-msgctxt "config description at :pleroma-:http_security > :ct_max_age"
-msgid "The maximum age for the Expect-CT header if sent"
-msgstr "The maximum age for the Expect-CT header if sent"
-
 #: lib/pleroma/docs/translator.ex:5
 #, elixir-autogen, elixir-format, fuzzy
 msgctxt "config description at :pleroma-:http_security > :enabled"
@@ -4420,12 +4414,6 @@ msgctxt "config label at :pleroma-:http > :user_agent"
 msgid "User agent"
 msgstr "User agent"
 
-#: lib/pleroma/docs/translator.ex:5
-#, elixir-autogen, elixir-format, fuzzy
-msgctxt "config label at :pleroma-:http_security > :ct_max_age"
-msgid "CT max age"
-msgstr "CT max age"
-
 #: lib/pleroma/docs/translator.ex:5
 #, elixir-autogen, elixir-format, fuzzy
 msgctxt "config label at :pleroma-:http_security > :enabled"
diff --git a/priv/gettext/nl/LC_MESSAGES/config_descriptions.po b/priv/gettext/nl/LC_MESSAGES/config_descriptions.po
index 4def37366..8ce06bf38 100644
--- a/priv/gettext/nl/LC_MESSAGES/config_descriptions.po
+++ b/priv/gettext/nl/LC_MESSAGES/config_descriptions.po
@@ -1759,12 +1759,6 @@ msgstr ""
 "What user agent to use. Must be a string or an atom `:default`. Default "
 "value is `:default`."
 
-#: lib/pleroma/docs/translator.ex:5
-#, elixir-autogen, elixir-format, fuzzy
-msgctxt "config description at :pleroma-:http_security > :ct_max_age"
-msgid "The maximum age for the Expect-CT header if sent"
-msgstr "The maximum age for the Expect-CT header if sent"
-
 #: lib/pleroma/docs/translator.ex:5
 #, elixir-autogen, elixir-format, fuzzy
 msgctxt "config description at :pleroma-:http_security > :enabled"
@@ -4420,12 +4414,6 @@ msgctxt "config label at :pleroma-:http > :user_agent"
 msgid "User agent"
 msgstr "User agent"
 
-#: lib/pleroma/docs/translator.ex:5
-#, elixir-autogen, elixir-format, fuzzy
-msgctxt "config label at :pleroma-:http_security > :ct_max_age"
-msgid "CT max age"
-msgstr "CT max age"
-
 #: lib/pleroma/docs/translator.ex:5
 #, elixir-autogen, elixir-format, fuzzy
 msgctxt "config label at :pleroma-:http_security > :enabled"
diff --git a/test/pleroma/web/plugs/http_security_plug_test.exs b/test/pleroma/web/plugs/http_security_plug_test.exs
index 7f85f4a11..d6d841078 100644
--- a/test/pleroma/web/plugs/http_security_plug_test.exs
+++ b/test/pleroma/web/plugs/http_security_plug_test.exs
@@ -17,7 +17,6 @@ defmodule Pleroma.Web.Plugs.HTTPSecurityPlugTest do
       refute Conn.get_resp_header(conn, "x-permitted-cross-domain-policies") == []
       refute Conn.get_resp_header(conn, "x-frame-options") == []
       refute Conn.get_resp_header(conn, "x-content-type-options") == []
-      refute Conn.get_resp_header(conn, "x-download-options") == []
       refute Conn.get_resp_header(conn, "referrer-policy") == []
       refute Conn.get_resp_header(conn, "content-security-policy") == []
     end
@@ -28,7 +27,6 @@ defmodule Pleroma.Web.Plugs.HTTPSecurityPlugTest do
       conn = get(conn, "/api/v1/instance")
 
       refute Conn.get_resp_header(conn, "strict-transport-security") == []
-      refute Conn.get_resp_header(conn, "expect-ct") == []
     end
 
     test "it does not send STS headers when disabled", %{conn: conn} do
@@ -37,7 +35,6 @@ defmodule Pleroma.Web.Plugs.HTTPSecurityPlugTest do
       conn = get(conn, "/api/v1/instance")
 
       assert Conn.get_resp_header(conn, "strict-transport-security") == []
-      assert Conn.get_resp_header(conn, "expect-ct") == []
     end
 
     test "referrer-policy header reflects configured value", %{conn: conn} do
@@ -155,7 +152,6 @@ defmodule Pleroma.Web.Plugs.HTTPSecurityPlugTest do
     assert Conn.get_resp_header(conn, "x-permitted-cross-domain-policies") == []
     assert Conn.get_resp_header(conn, "x-frame-options") == []
     assert Conn.get_resp_header(conn, "x-content-type-options") == []
-    assert Conn.get_resp_header(conn, "x-download-options") == []
     assert Conn.get_resp_header(conn, "referrer-policy") == []
     assert Conn.get_resp_header(conn, "content-security-policy") == []
   end