diff --git a/pkgs/development/ocaml-modules/apron/default.nix b/pkgs/development/ocaml-modules/apron/default.nix
index a57e4a1007ef..b57476302def 100644
--- a/pkgs/development/ocaml-modules/apron/default.nix
+++ b/pkgs/development/ocaml-modules/apron/default.nix
@@ -60,7 +60,7 @@ stdenv.mkDerivation (finalAttrs: {
 
   meta = {
     license = lib.licenses.lgpl21;
-    homepage = "http://apron.cri.ensmp.fr/library/";
+    homepage = "https://github.com/antoinemine/apron";
     maintainers = [ lib.maintainers.vbgl ];
     description = "Numerical abstract domain library";
     inherit (ocaml.meta) platforms;
diff --git a/pkgs/development/ocaml-modules/ocurl/default.nix b/pkgs/development/ocaml-modules/ocurl/default.nix
index aed74a0360bf..6b760091428d 100644
--- a/pkgs/development/ocaml-modules/ocurl/default.nix
+++ b/pkgs/development/ocaml-modules/ocurl/default.nix
@@ -36,7 +36,7 @@ stdenv.mkDerivation rec {
   meta = {
     description = "OCaml bindings to libcurl (deprecated)";
     license = lib.licenses.mit;
-    homepage = "http://ygrek.org.ua/p/ocurl/";
+    homepage = "https://ygrek.org/p/ocurl/";
     maintainers = with lib.maintainers; [
       dandellion
       bennofs
diff --git a/pkgs/development/ocaml-modules/piqi-ocaml/default.nix b/pkgs/development/ocaml-modules/piqi-ocaml/default.nix
index cdcde0f4f924..c67cdaf47d47 100644
--- a/pkgs/development/ocaml-modules/piqi-ocaml/default.nix
+++ b/pkgs/development/ocaml-modules/piqi-ocaml/default.nix
@@ -44,7 +44,7 @@ stdenv.mkDerivation rec {
 
   meta = {
     description = "Universal schema language and a collection of tools built around it. These are the ocaml bindings";
-    homepage = "https://piqi.org";
+    homepage = "https://github.com/alavrik/piqi";
     license = lib.licenses.asl20;
     maintainers = [ lib.maintainers.maurer ];
     mainProgram = "piqic-ocaml";
diff --git a/pkgs/development/ocaml-modules/piqi/default.nix b/pkgs/development/ocaml-modules/piqi/default.nix
index 7456581b8971..520e07e5dc37 100644
--- a/pkgs/development/ocaml-modules/piqi/default.nix
+++ b/pkgs/development/ocaml-modules/piqi/default.nix
@@ -52,7 +52,7 @@ stdenv.mkDerivation rec {
   ];
 
   meta = {
-    homepage = "https://piqi.org";
+    homepage = "https://github.com/alavrik/piqi";
     description = "Universal schema language and a collection of tools built around it";
     license = lib.licenses.asl20;
     maintainers = [ lib.maintainers.maurer ];
diff --git a/pkgs/development/ocaml-modules/sawja/default.nix b/pkgs/development/ocaml-modules/sawja/default.nix
index 197e1627d1ff..0d7409e747ea 100644
--- a/pkgs/development/ocaml-modules/sawja/default.nix
+++ b/pkgs/development/ocaml-modules/sawja/default.nix
@@ -49,7 +49,7 @@ stdenv.mkDerivation {
 
   meta = {
     description = "Library written in OCaml, relying on Javalib to provide a high level representation of Java bytecode programs";
-    homepage = "http://sawja.inria.fr/";
+    homepage = "https://github.com/javalib-team/sawja";
     license = lib.licenses.gpl3Plus;
     maintainers = [ lib.maintainers.vbgl ];
     inherit (ocaml.meta) platforms;
diff --git a/pkgs/development/ocaml-modules/sosa/default.nix b/pkgs/development/ocaml-modules/sosa/default.nix
index 9eb2da21118b..2182e1ba4ce6 100644
--- a/pkgs/development/ocaml-modules/sosa/default.nix
+++ b/pkgs/development/ocaml-modules/sosa/default.nix
@@ -40,7 +40,7 @@ stdenv.mkDerivation rec {
   doCheck = true;
 
   meta = {
-    homepage = "http://www.hammerlab.org/docs/sosa/master/index.html";
+    homepage = "https://github.com/hammerlab/sosa";
     description = "Sane OCaml String API";
     license = lib.licenses.isc;
     maintainers = [ ];
diff --git a/pkgs/development/ocaml-modules/ssl/default.nix b/pkgs/development/ocaml-modules/ssl/default.nix
index 163daa0e66fa..7b86332a77d1 100644
--- a/pkgs/development/ocaml-modules/ssl/default.nix
+++ b/pkgs/development/ocaml-modules/ssl/default.nix
@@ -35,7 +35,7 @@ buildDunePackage rec {
   '';
 
   meta = {
-    homepage = "http://savonet.rastageeks.org/";
+    homepage = "https://www.liquidsoap.info/ocaml-ssl/ssl/index.html";
     description = "OCaml bindings for libssl";
     license = with lib.licenses; [
       lgpl21Plus
diff --git a/pkgs/development/ocaml-modules/xml-light/default.nix b/pkgs/development/ocaml-modules/xml-light/default.nix
index 8d0bf0dd9be2..755aea2c1ab8 100644
--- a/pkgs/development/ocaml-modules/xml-light/default.nix
+++ b/pkgs/development/ocaml-modules/xml-light/default.nix
@@ -25,7 +25,7 @@ buildDunePackage rec {
       entirely written in OCaml, hence it does not require additional C
       library.
     '';
-    homepage = "http://tech.motion-twin.com/xmllight.html";
+    homepage = "https://github.com/ncannasse/xml-light";
     license = lib.licenses.lgpl21;
     maintainers = [ lib.maintainers.romildo ];
   };
diff --git a/pkgs/development/ocaml-modules/zmq/default.nix b/pkgs/development/ocaml-modules/zmq/default.nix
index af8c78cb9938..6426b435172b 100644
--- a/pkgs/development/ocaml-modules/zmq/default.nix
+++ b/pkgs/development/ocaml-modules/zmq/default.nix
@@ -23,6 +23,6 @@ buildDunePackage rec {
     description = "ZeroMQ bindings for OCaml";
     license = lib.licenses.mit;
     maintainers = with lib.maintainers; [ akavel ];
-    homepage = "https://engineering.issuu.com/ocaml-zmq/";
+    homepage = "https://github.com/issuu/ocaml-zmq";
   };
 }