diff --git a/pkgs/development/libraries/olm/default.nix b/pkgs/development/libraries/olm/default.nix
new file mode 100644
index 000000000000..db4a82290645
--- /dev/null
+++ b/pkgs/development/libraries/olm/default.nix
@@ -0,0 +1,22 @@
+{ stdenv, fetchurl }:
+
+stdenv.mkDerivation rec {
+  name = "olm-${version}";
+  version = "2.2.1";
+
+  meta = {
+    description = "Implements double cryptographic ratchet and Megolm ratchet";
+    license = stdenv.lib.licenses.asl20;
+    homepage = "https://matrix.org/git/olm/about";
+  };
+
+  src = fetchurl {
+    url = "https://matrix.org/git/olm/snapshot/${name}.tar.gz";
+    sha256 = "1spgsjmsw8afm2hg1mrq9c7cli3p17wl0ns7qbzn0h6ksh193709";
+  };
+
+  doCheck = true;
+  checkTarget = "test";
+
+  installFlags = "PREFIX=$(out)";
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 8dcd5373cecf..18918b7700f5 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -8947,6 +8947,8 @@ with pkgs;
 
   ogrepaged = callPackage ../development/libraries/ogrepaged { };
 
+  olm = callPackage ../development/libraries/olm { };
+
   oniguruma = callPackage ../development/libraries/oniguruma { };
 
   openal = self.openalSoft;