diff --git a/3proxy-release-key-ed25519.asc b/3proxy-release-key-ed25519.asc
new file mode 100644
index 0000000..6cc88b5
--- /dev/null
+++ b/3proxy-release-key-ed25519.asc
@@ -0,0 +1,10 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
+mDMEaogJthYJKwYBBAHaRw8BAQdA8rZ4l90kTOSrlosP0yyeX6jFGfiFFizawjS0
+vyQnmu60KjNwcm94eSByZWxlYXNlIHNpZ25pbmcgPDNwcm94eUAzcHJveHkub3Jn
+PoivBBMWCgBXFiEEvHxfo3tIuOfF5ScUw2JYsMbAg6oFAmqICbYbFIAAAAAABAAO
+bWFudTIsMi41KzEuMTIsMCwzAhsDBQsJCAcCAiICBhUKCQgLAgQWAgMBAh4HAheA
+AAoJEMNiWLDGwIOqBHIA/iRus5VEqL+v6nYQ+GDLDUZJzMfFcnDBI+BOOhiESnTp
+AP4s3uvhigRcdutxkYwSXBlJ+7wE1yZeuUmjPoJXvgNaDw==
+=Ngp2
+-----END PGP PUBLIC KEY BLOCK-----
diff --git a/3proxy-release-key.asc b/3proxy-release-key.asc
index 6cc88b5..dd4b408 100644
--- a/3proxy-release-key.asc
+++ b/3proxy-release-key.asc
@@ -1,10 +1,29 @@
 -----BEGIN PGP PUBLIC KEY BLOCK-----
 
-mDMEaogJthYJKwYBBAHaRw8BAQdA8rZ4l90kTOSrlosP0yyeX6jFGfiFFizawjS0
-vyQnmu60KjNwcm94eSByZWxlYXNlIHNpZ25pbmcgPDNwcm94eUAzcHJveHkub3Jn
-PoivBBMWCgBXFiEEvHxfo3tIuOfF5ScUw2JYsMbAg6oFAmqICbYbFIAAAAAABAAO
-bWFudTIsMi41KzEuMTIsMCwzAhsDBQsJCAcCAiICBhUKCQgLAgQWAgMBAh4HAheA
-AAoJEMNiWLDGwIOqBHIA/iRus5VEqL+v6nYQ+GDLDUZJzMfFcnDBI+BOOhiESnTp
-AP4s3uvhigRcdutxkYwSXBlJ+7wE1yZeuUmjPoJXvgNaDw==
-=Ngp2
+mQINBGqIZCIBEADF3zxdMo2dvUGAlQm3aIcQiqmpLMHucvLfSK3fHtwagO8f03CO
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+EwEIAFcWIQT8EiFEmfzHuhz/bNwDEjhOOnOUCwUCaohkIhsUgAAAAAAEAA5tYW51
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+vDKdzJd6jug5YQRfV/7YVC2hdSOBLvBuDpRINePrj9CKJ34qG+jRSJ5xwYk=
+=IS3Y
 -----END PGP PUBLIC KEY BLOCK-----
diff --git a/SECURITY.md b/SECURITY.md
index 784994f..ce83528 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -19,12 +19,26 @@ Release binaries are published with SHA256 checksums, an OpenPGP signature and
 a GitHub build provenance attestation.
 
 The release signing key is `3proxy-release-key.asc` in the root of this
-repository. Import it once:
+repository, an RSA-4096 key:
+
+```
+pub   rsa4096 2026-08-21 [SC]
+      FC12 2144 99FC C7BA 1CFF  6CDC 0312 384E 3A73 940B
+uid   3proxy release signing <3proxy@3proxy.org>
+```
+
+Import it once:
 
 ```
 gpg --import 3proxy-release-key.asc
 ```
 
+Releases up to and including 0.9.9 were signed with an Ed25519 key, kept as
+`3proxy-release-key-ed25519.asc` for verifying those older files. Note that
+rpm 4.14 and earlier (RHEL/CentOS 8 and older) cannot import an Ed25519 key
+and will report `SIGNATURES NOT OK`; use the RSA key and 0.9.9.1 or later on
+those systems.
+
 Checksums and the checksum file signature:
 
 ```