diff --git a/deps/checksums/zlib b/deps/checksums/zlib
index 6036eb48bcd987..d524a3f588a184 100644
--- a/deps/checksums/zlib
+++ b/deps/checksums/zlib
@@ -1,34 +1,34 @@
-Zlib.v1.2.12+0.aarch64-apple-darwin.tar.gz/md5/3da8ceb0b4357ebcf6ef8d1deb0e3f1d
-Zlib.v1.2.12+0.aarch64-apple-darwin.tar.gz/sha512/76042fa8afe54b01bf927f0a346dca8d80dd141601af8ce4779f5625bf0846b9fe04045d85c58fe49b0f10322c65a2a17a498c540ca3e9646d0e8c9baedd9960
-Zlib.v1.2.12+0.aarch64-linux-gnu.tar.gz/md5/c738dc8c1c12edcf34e5f6c5673c3e2e
-Zlib.v1.2.12+0.aarch64-linux-gnu.tar.gz/sha512/da591897441d263f1161412131ba2fb9018929da295314a5aebd35ce945b911298c03c9d2e33ea95255113b2af19cdca8f73138bcf5bfc7dea759c86e4b24ae7
-Zlib.v1.2.12+0.aarch64-linux-musl.tar.gz/md5/d3456a508e5c95a7d09078c7064a450f
-Zlib.v1.2.12+0.aarch64-linux-musl.tar.gz/sha512/f8fcb842a770389d21eb5c591b7d777e19cfea66b690ac9b379292df666483dd54fe1e1242df66ac1793fe253b1f70413d8ae81f017974f4a82b47cf87f57ab2
-Zlib.v1.2.12+0.armv6l-linux-gnueabihf.tar.gz/md5/3eb00f9e732f1e00bd4f742330e4ae84
-Zlib.v1.2.12+0.armv6l-linux-gnueabihf.tar.gz/sha512/268ad885a371309d8765cb1b88ee20f624174bd1c65e02f4547d29ff69e6370acd2385d90932da95497c78b75d9066e4ef2944e99afd440219d9c58ce4a3c5cc
-Zlib.v1.2.12+0.armv6l-linux-musleabihf.tar.gz/md5/94da46b4c9ed3cebc29c29ae52c418c3
-Zlib.v1.2.12+0.armv6l-linux-musleabihf.tar.gz/sha512/0707f1043212f9d026bef511d30250f1697e65e66ee5f55c1c1ef8c37dc65f9ee4153a416f6d76922e90a3cd217bfc1e6cdeb285af02dc614e49f5800a50f27c
-Zlib.v1.2.12+0.armv7l-linux-gnueabihf.tar.gz/md5/e68baf32ed7b38e7d099b8273215eec0
-Zlib.v1.2.12+0.armv7l-linux-gnueabihf.tar.gz/sha512/27b43f1cda48bb355277819195eb24e48b790473a0edd4451fea338b77df23912efc53e93acc7d1b678ffd9f1c3d35f8f79b5f4f2ce2232ba7bafbdd56d0dcec
-Zlib.v1.2.12+0.armv7l-linux-musleabihf.tar.gz/md5/5fa1d6d03946b8172a1f97a7928d8647
-Zlib.v1.2.12+0.armv7l-linux-musleabihf.tar.gz/sha512/f8c8f39c7cf1edb1e81ea37861cdd8c67babde0e0eee5051aa813815a7bb0e9c3d9688fa5fd897ee58fe9e080018da74d23f7f405d161890a2644698f077a117
-Zlib.v1.2.12+0.i686-linux-gnu.tar.gz/md5/3e54c3f0e23600b65fe4d694ca2884c9
-Zlib.v1.2.12+0.i686-linux-gnu.tar.gz/sha512/f44cb6dd92ee254f6c7af3261d472ac74b443096853b2bd0d25135bff937eb306726f640edb2dd6671414e131b626f8105f6f5430b030d4e859ce2d7b277498a
-Zlib.v1.2.12+0.i686-linux-musl.tar.gz/md5/0155630e60c4943d7d44ec918d7e0097
-Zlib.v1.2.12+0.i686-linux-musl.tar.gz/sha512/2ea00e33f0162cecf4f2ab9a8098976ee45c05a0c96262dce388ff1a8c079449cfbcf01427f19ab621e114eb0fd0341a00753a92b6564d64d751107c79c446ad
-Zlib.v1.2.12+0.i686-w64-mingw32.tar.gz/md5/01e39978cf3e0e6c1c63f8ccbc8b2797
-Zlib.v1.2.12+0.i686-w64-mingw32.tar.gz/sha512/2c7a4528eb5884003d3a1a2814dffe242c58b07a089e37e0f31f6b950ea8ae1e6f4c792691ba4f673fab69790215cdcad11c217bf0531b55c5599991d8aedf83
-Zlib.v1.2.12+0.powerpc64le-linux-gnu.tar.gz/md5/468c1ae3575329dfcffa1c3761ca9516
-Zlib.v1.2.12+0.powerpc64le-linux-gnu.tar.gz/sha512/b21f722b21fa58fb8132772403782982b57468071f0ce4e49404eb0fa25f6fa8bc839e5b78fbe58b90b5fcf2e6122a4b05d3ef962c81be2c98934c800731c871
-Zlib.v1.2.12+0.x86_64-apple-darwin.tar.gz/md5/b41e1627c04d338bdee69708a21d2f93
-Zlib.v1.2.12+0.x86_64-apple-darwin.tar.gz/sha512/491831fc646f38a8961f820f599a468f5da19e9c60e618212fb8304d2919e5becf6f166b17ce75011f1a9dcd9aeb84b59a601990515bb14c995347f129c1565a
-Zlib.v1.2.12+0.x86_64-linux-gnu.tar.gz/md5/2a253a27b151860a58ba0e910475c215
-Zlib.v1.2.12+0.x86_64-linux-gnu.tar.gz/sha512/7ba7358f0e1f71c8be2bf062ea2dec0076703605895bfe1ebd78da43ae0f0dde449b3d8d777dc5ea6d7d1b51b83e138c23851bfe5f22fc049418209c2e026b35
-Zlib.v1.2.12+0.x86_64-linux-musl.tar.gz/md5/ac8344b22355cbdc6551f0646ea63a09
-Zlib.v1.2.12+0.x86_64-linux-musl.tar.gz/sha512/da89ffbfa429786baf0e6ae2ffd1d0b06fe8c8f7836e7cbeccaa132325570539f811097c70c14c771f907b39eec5b515f9346e8ffe78003d0f92c5f0ff76886c
-Zlib.v1.2.12+0.x86_64-unknown-freebsd.tar.gz/md5/34396d60e6ba6562abb4c18f520bcb57
-Zlib.v1.2.12+0.x86_64-unknown-freebsd.tar.gz/sha512/01a39f992b59b1996a4ec6a0127600b5776ea40baddf2826932f30f9424f4c1edf2d570a08b153e7d0331de46c51477d10d796151dfe3816892c3fb083cb63da
-Zlib.v1.2.12+0.x86_64-w64-mingw32.tar.gz/md5/5ea885cdd8e48b43d0637b15a43df803
-Zlib.v1.2.12+0.x86_64-w64-mingw32.tar.gz/sha512/c58e407b123112a180c0fd260d0b7da5657db83a1ffa562797617e3f755dcbd2846dee602aba7aa107f98be655669c889b2f96dcfd1f50ca153a5e055905b8e4
-zlib-cacf7f1d4e3d44d871b605da3b647f07d718623f.tar.gz/md5/93d10d4dd040f14ae63417070d1346e8
-zlib-cacf7f1d4e3d44d871b605da3b647f07d718623f.tar.gz/sha512/a1e9c5a2963266a582192d0fe88c179f5239245f11c4df4427dda755ad77d31e1fcf045d7d3fe49141090f4ff8da13d9a2e8d8d317fe6460a5f3e9bdea29b883
+Zlib.v1.2.12+3.aarch64-apple-darwin.tar.gz/md5/2258883a6412fbdac0b807afd133834f
+Zlib.v1.2.12+3.aarch64-apple-darwin.tar.gz/sha512/6e82b57646dfe2b86978d51cb4401d565d00d6bdcfabe09ceb888ad8979bd1398fd9ea7652542f149d88c120110f6c3baa919616f01410e9238a5199f50f5dda
+Zlib.v1.2.12+3.aarch64-linux-gnu.tar.gz/md5/663aa0d0791b92464e4822a130ac7fa9
+Zlib.v1.2.12+3.aarch64-linux-gnu.tar.gz/sha512/e50f00d92600a78b2f540e0e8e1dce435d0d0499ea80ce3c3cd0e11c8e3b5b1a97eadca9ac863f597cee369e80bcd50ec1c0a0e0f1a87bb0ff94bbaf453dea2d
+Zlib.v1.2.12+3.aarch64-linux-musl.tar.gz/md5/471179a2364d59abb6426b378ea4e195
+Zlib.v1.2.12+3.aarch64-linux-musl.tar.gz/sha512/35208e4be5966343ecb2b78471a3e1a947489f83c828b562db3508506dd0493eae3318c7eb3a6b599e911416795023193df862fbb6fcc7389d44710dc30f16a8
+Zlib.v1.2.12+3.armv6l-linux-gnueabihf.tar.gz/md5/53601c0201dadc8c9ff038167d5c4277
+Zlib.v1.2.12+3.armv6l-linux-gnueabihf.tar.gz/sha512/19744283bb412a656b934347cb7a1d121fbaf7e5f9b1aac373ddf2466567b731817a2e72e3a4d993ca7e5b5eb1fd9bb9c24d0126778367b28bdb94721649298b
+Zlib.v1.2.12+3.armv6l-linux-musleabihf.tar.gz/md5/f7c923955fc600785aae455807e63c8b
+Zlib.v1.2.12+3.armv6l-linux-musleabihf.tar.gz/sha512/623cd1758465c9e40b0dad93981ae93097a03f4aa67487b7e1c7240be2d780d86f35f8db96743c35bbb329d572741b58e73735a2b1cfb9e18e77f4dbcc714063
+Zlib.v1.2.12+3.armv7l-linux-gnueabihf.tar.gz/md5/5ce0fe42f67e09de047626424d61bc82
+Zlib.v1.2.12+3.armv7l-linux-gnueabihf.tar.gz/sha512/322e32d6fe6cd7a3334f5146f8980d4f1fc85b9a1c60271659ba8b4bbfdec314f8d9e8c6c0719248f5dd18e3daefd946811a3dcc74fa3ae5505d6dd653e65309
+Zlib.v1.2.12+3.armv7l-linux-musleabihf.tar.gz/md5/5115c374df90393cb895dd45c77275c4
+Zlib.v1.2.12+3.armv7l-linux-musleabihf.tar.gz/sha512/b04b4f42220833b99923a3ff349e4a05ad9f67c2b62d4848de37c833b287420b1dbec8a039c09d2a95ab6b68a62c6dcbacb4ba7cc069a4e90a11f8592719d2b8
+Zlib.v1.2.12+3.i686-linux-gnu.tar.gz/md5/37e0186f765fada0d76b9cd6f28c8d5d
+Zlib.v1.2.12+3.i686-linux-gnu.tar.gz/sha512/1239675bbf46c6243131585283b0fc23baa32e68226fbb2f0b7a833c8979e2df33590947daade533e37bafe21838a10198e9f9de99e094c21fba6b218b2fceab
+Zlib.v1.2.12+3.i686-linux-musl.tar.gz/md5/a0d92af6481929eed3a9fec3dbb2e622
+Zlib.v1.2.12+3.i686-linux-musl.tar.gz/sha512/b448590129ef251083b675c3d7494a90151a03297fd9883efb70bde032d106f16f2ec7c28508d9b4a0d0e5a0be0bdb4bcf0d1a9e4b2ade034a6d6cfc4916536e
+Zlib.v1.2.12+3.i686-w64-mingw32.tar.gz/md5/cc38d9ec5430e2ed7fed4792c7ac9551
+Zlib.v1.2.12+3.i686-w64-mingw32.tar.gz/sha512/85ad3babb42682d7b2b69513a30fd5e992a56436dcd7e2a44800bf1bc30d60d09aff5769cfaeefd4f5668e7973a0c2d4ad4d28559ea5f28c1c5419ed595eae57
+Zlib.v1.2.12+3.powerpc64le-linux-gnu.tar.gz/md5/8f57d8c31d2355c64a05db0412462d58
+Zlib.v1.2.12+3.powerpc64le-linux-gnu.tar.gz/sha512/9a0208c7a4dbf71b6f7e1ccaf05e3f3a422507cf0431b6482aab1a7b1bea41bd135320567f7dba6666f37c26f48cb3a627f1a1ebd39bf5c2d61148aadf62a986
+Zlib.v1.2.12+3.x86_64-apple-darwin.tar.gz/md5/5d15bb591d26d24aa9d6c9c8cf3df097
+Zlib.v1.2.12+3.x86_64-apple-darwin.tar.gz/sha512/7d8b0ec5a46a85cef3c5de451823c5cfa73b5b7c5ac98699065bbc5692af556195664908cd5c35184b7a9586fc0adab41fc0f76ee8599ca09a740cf49b9be113
+Zlib.v1.2.12+3.x86_64-linux-gnu.tar.gz/md5/25df63b9e6cbef14b0f0bf2a9eec5d14
+Zlib.v1.2.12+3.x86_64-linux-gnu.tar.gz/sha512/2660b762d816491e6b877020d8dd4a1cf1b171d6232dd5e0f47c6ee7b15504b006cc8f051434df778e0910130ef7456e30d531464470d3c4a2502e8f9fd19e76
+Zlib.v1.2.12+3.x86_64-linux-musl.tar.gz/md5/3f0c85d248711608141046d15b2da339
+Zlib.v1.2.12+3.x86_64-linux-musl.tar.gz/sha512/e4256b1b9520d5b0d97fa7e7ca6f6b9aa2583c6e5f14967392d54e48f27e242461f77e522743b229ab9b333eec5fd51f6d7b1559b566bd68ca0741b05b96df3c
+Zlib.v1.2.12+3.x86_64-unknown-freebsd.tar.gz/md5/e67dae1456645930c9e2b2fef6f805c8
+Zlib.v1.2.12+3.x86_64-unknown-freebsd.tar.gz/sha512/5915ec48ae80be829c36a71e2ce580d2d14b7a9824c8f279ad5c69fea62d9a03345b665f224b9dde0bc4b808af246f89ec4f932d47a14236bc3b7db7651e5bec
+Zlib.v1.2.12+3.x86_64-w64-mingw32.tar.gz/md5/89b152b3de0068c7c2580b87ad529ed3
+Zlib.v1.2.12+3.x86_64-w64-mingw32.tar.gz/sha512/df4b585f6501f45bc85e8d00c1b03c482d70d3491081246f9e9f9560f90c5f6057b1174a81e653f725209323cd743cf05d3e1aba1385afd26cb6f8c50186f818
+zlib-21767c654d31d2dccdde4330529775c6c5fd5389.tar.gz/md5/1fb2320f871561306bc87b3894727b45
+zlib-21767c654d31d2dccdde4330529775c6c5fd5389.tar.gz/sha512/2ad1e728f97a81b65d24fe5bef66658c94222d717a3486a0d11682b61563d7eaaa578f7457078881e8ed8c91b87aec11634d4a64021546e23a3ecabb3285197a
diff --git a/deps/zlib.version b/deps/zlib.version
index e3631693150511..0b16a7f662dd17 100644
--- a/deps/zlib.version
+++ b/deps/zlib.version
@@ -1,2 +1,2 @@
-ZLIB_BRANCH=v1.2.11
-ZLIB_SHA1=cacf7f1d4e3d44d871b605da3b647f07d718623f
+ZLIB_BRANCH=v1.2.12
+ZLIB_SHA1=21767c654d31d2dccdde4330529775c6c5fd5389
diff --git a/stdlib/Zlib_jll/Project.toml b/stdlib/Zlib_jll/Project.toml
index 570c1aace7c316..60a2966a562fb0 100644
--- a/stdlib/Zlib_jll/Project.toml
+++ b/stdlib/Zlib_jll/Project.toml
@@ -1,6 +1,6 @@
 name = "Zlib_jll"
 uuid = "83775a58-1f1d-513f-b197-d71354ab007a"
-version = "1.2.12+0"
+version = "1.2.12+3"
 
 [deps]
 Libdl = "8f399da3-3557-5675-b5ff-fb832c97cbdb"
diff --git a/stdlib/Zlib_jll/test/runtests.jl b/stdlib/Zlib_jll/test/runtests.jl
index e6adc6b7c951f8..cc9e64188a0aa6 100644
--- a/stdlib/Zlib_jll/test/runtests.jl
+++ b/stdlib/Zlib_jll/test/runtests.jl
@@ -3,5 +3,5 @@
 using Test, Zlib_jll
 
 @testset "Zlib_jll" begin
-    @test VersionNumber(unsafe_string(ccall((:zlibVersion, libz), Cstring, ()))) == v"1.2.11"
+    @test VersionNumber(unsafe_string(ccall((:zlibVersion, libz), Cstring, ()))) == v"1.2.12"
 end