diff --git a/.github/workflows/ci.ml b/.github/workflows/ci.ml
index a7e14541c02..70a6e0ef045 100644
--- a/.github/workflows/ci.ml
+++ b/.github/workflows/ci.ml
@@ -476,8 +476,8 @@ let main oc : unit =
     ("OPAM12CACHE", "~/.cache/opam1.2/cache");
     (* These should be identical to the values in appveyor.yml *)
     ("OPAM_REPO", "https://github.com/ocaml/opam-repository.git");
-    ("OPAM_TEST_REPO_SHA", "c687553afb80373165068d67f33512b7ad39e6a3");
-    ("OPAM_REPO_SHA", "c687553afb80373165068d67f33512b7ad39e6a3");
+    ("OPAM_TEST_REPO_SHA", "c61e9068d528d92b1d6ac84a06cf44489b10b835");
+    ("OPAM_REPO_SHA", "c61e9068d528d92b1d6ac84a06cf44489b10b835");
     ("SOLVER", "");
     (* Cygwin configuration *)
     ("CYGWIN_MIRROR", "http://mirrors.kernel.org/sourceware/cygwin/");
diff --git a/.github/workflows/depexts.yml b/.github/workflows/depexts.yml
index 54412a45d25..fe29bbfc855 100644
--- a/.github/workflows/depexts.yml
+++ b/.github/workflows/depexts.yml
@@ -18,7 +18,7 @@ defaults:
 env:
   OPAMVERSION: 2.1.0
   OPAM_REPO: https://github.com/ocaml/opam-repository.git
-  OPAM_REPO_SHA: c687553afb80373165068d67f33512b7ad39e6a3
+  OPAM_REPO_SHA: c61e9068d528d92b1d6ac84a06cf44489b10b835
 
 jobs:
   opam-cache:
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 215c1fd1173..4f68e27c606 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -26,8 +26,8 @@ env:
   OPAMBSROOT: ~/.cache/.opam.cached
   OPAM12CACHE: ~/.cache/opam1.2/cache
   OPAM_REPO: https://github.com/ocaml/opam-repository.git
-  OPAM_TEST_REPO_SHA: c687553afb80373165068d67f33512b7ad39e6a3
-  OPAM_REPO_SHA: c687553afb80373165068d67f33512b7ad39e6a3
+  OPAM_TEST_REPO_SHA: c61e9068d528d92b1d6ac84a06cf44489b10b835
+  OPAM_REPO_SHA: c61e9068d528d92b1d6ac84a06cf44489b10b835
   SOLVER:
   CYGWIN_MIRROR: http://mirrors.kernel.org/sourceware/cygwin/
   CYGWIN_ROOT: D:\cygwin
diff --git a/master_changes.md b/master_changes.md
index 22dd06415f5..cc83d1da55c 100644
--- a/master_changes.md
+++ b/master_changes.md
@@ -97,11 +97,13 @@ users)
 ## Build
   * Upgrade vendored cmdliner to 1.3.0 [#5970 @kit-ty-kate]
   * Remove unused/untested Makefile targets lib-pkg [#5494 @kit-ty-kate]
+  * Upgrade vendored OCaml compiler to 4.14.2 [#5976 @kit-ty-kate]
 
 ## Infrastructure
   * Ensure GNU coreutils available on the macOS 14 CI runners [#5938 @dra27]
 
 ## Release scripts
+  * Upgrade the OCaml compiler used for releases to 4.14.2 [#5976 @kit-ty-kate]
 
 ## Install script
 
diff --git a/release/Makefile b/release/Makefile
index 880a0cd2953..d559c8eb576 100644
--- a/release/Makefile
+++ b/release/Makefile
@@ -3,7 +3,7 @@ VERSION = $(shell git describe $(TAG))
 OPAM_VERSION = $(subst -,~,$(VERSION))
 GIT_URL = ..
 
-OCAMLV = 4.14.0
+OCAMLV = 4.14.2
 # currently hardcoded in Dockerfile.in
 OCAML_URL = https://caml.inria.fr/pub/distrib/ocaml-$(basename $(OCAMLV))/ocaml-$(OCAMLV).tar.gz
 
diff --git a/src_ext/Makefile b/src_ext/Makefile
index 3136bc64365..84f03290422 100644
--- a/src_ext/Makefile
+++ b/src_ext/Makefile
@@ -8,8 +8,8 @@ endif
 
 PATCH ?= patch
 
-URL_ocaml = https://caml.inria.fr/pub/distrib/ocaml-4.14/ocaml-4.14.1.tar.gz
-MD5_ocaml = c45b013a233c9a4b80c3930d723d19dd
+URL_ocaml = https://caml.inria.fr/pub/distrib/ocaml-4.14/ocaml-4.14.2.tar.gz
+MD5_ocaml = f2fa20be4eea01f837b3556ff282d9b0
 
 URL_flexdll = https://github.com/ocaml/flexdll/archive/0.43.tar.gz
 MD5_flexdll = 6ce706f6c65b2c5adf5791fac678f090