diff --git a/CHANGELOG.markdown b/CHANGELOG.markdown
index b3fc181..64b8974 100644
--- a/CHANGELOG.markdown
+++ b/CHANGELOG.markdown
@@ -2,6 +2,7 @@
 
 ## unreleased
 
+* oxipng 9.1.1 [@toy](https://github.com/toy)
 * Use container instead of vagrant to build linux binaries [@toy](https://github.com/toy)
 
 ## v0.10.1.20240317 (2024-03-17)
diff --git a/Makefile b/Makefile
index 86e0ee1..87ed04a 100644
--- a/Makefile
+++ b/Makefile
@@ -13,7 +13,7 @@ LIBMOZJPEG_VER := 4.1.5
 LIBPNG_VER := 1.6.43
 LIBZ_VER := 1.2.11
 OPTIPNG_VER := 0.7.8
-OXIPNG_VER := 9.0.0
+OXIPNG_VER := 9.1.1
 PNGCRUSH_VER := 1.8.13
 PNGOUT_VER := 20200115
 PNGOUT_LINUX_VER := $(PNGOUT_VER)
diff --git a/checksums.mk b/checksums.mk
index 27ec5f7..3b1ae51 100644
--- a/checksums.mk
+++ b/checksums.mk
@@ -9,7 +9,7 @@ LIBMOZJPEG_SHA256 := 9fcbb7171f6ac383f5b391175d6fb3acde5e64c4c4727274eade84ed099
 LIBPNG_SHA256 := e804e465d4b109b5ad285a8fb71f0dd3f74f0068f91ce3cdfde618180c174925
 LIBZ_SHA256 := c3e5e9fdd5004dcb542feda5ee4f0ff0744628baf8ed2dd5d66f8ca1197cb1a1
 OPTIPNG_SHA256 := 25a3bd68481f21502ccaa0f4c13f84dcf6b20338e4c4e8c51f2cefbd8513398c
-OXIPNG_SHA256 := 534fa8f349f52b01c2ee4332cef25ce1311edca04209ac6d972e38b171550a1b
+OXIPNG_SHA256 := f50db90c7ef95c0964dc980f6596b821f362e15d6d4bab247f1eb4aab7554db8
 PNGCRUSH_SHA256 := fed0aaf5c098aa8c7f78c75365cd18d7341417326ecbdba547876b7b4f3df4be
 PNGOUT_LINUX_SHA256 := ac38bba6f0de29033de866538c3afa64341319b695bbe388efbc5fd9e830e928
 PNGOUT_LINUX_STATIC_SHA256 := 7a78ea475d65a00981bf418e5dfa3b34e42d6460fb992340802873bb14b08597
diff --git a/vendor/darwin-x86_64/oxipng b/vendor/darwin-x86_64/oxipng
index 92881cd..212dd9a 100755
Binary files a/vendor/darwin-x86_64/oxipng and b/vendor/darwin-x86_64/oxipng differ
diff --git a/vendor/linux-x86_64/oxipng b/vendor/linux-x86_64/oxipng
index 47173af..e3e719a 100755
Binary files a/vendor/linux-x86_64/oxipng and b/vendor/linux-x86_64/oxipng differ