diff --git a/geneit_backend/Cargo.lock b/geneit_backend/Cargo.lock
index ff9909f..2d97a4e 100644
--- a/geneit_backend/Cargo.lock
+++ b/geneit_backend/Cargo.lock
@@ -792,15 +792,6 @@ version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "98cc8fbded0c607b7ba9dd60cd98df59af97e84d24e49c8557331cfc26d301ce"
 
-[[package]]
-name = "cmake"
-version = "0.1.50"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a31c789563b815f77f4250caee12365734369f942439b7defd71e18a48197130"
-dependencies = [
- "cc",
-]
-
 [[package]]
 name = "color_quant"
 version = "1.1.0"
@@ -1269,7 +1260,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5f54427cfd1c7829e2a139fcefea601bf088ebca651d2bf53ebc600eac295dae"
 dependencies = [
  "crc32fast",
- "libz-ng-sys",
  "miniz_oxide",
 ]
 
@@ -2000,16 +1990,6 @@ dependencies = [
  "libc",
 ]
 
-[[package]]
-name = "libz-ng-sys"
-version = "1.1.15"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c6409efc61b12687963e602df8ecf70e8ddacf95bc6576bcf16e3ac6328083c5"
-dependencies = [
- "cmake",
- "libc",
-]
-
 [[package]]
 name = "light-openid"
 version = "1.0.2"
@@ -2057,6 +2037,12 @@ dependencies = [
  "scopeguard",
 ]
 
+[[package]]
+name = "lockfree-object-pool"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9374ef4228402d4b7e403e5838cb880d9ee663314b0a900d5a6aabf0c213552e"
+
 [[package]]
 name = "log"
 version = "0.4.21"
@@ -3627,12 +3613,6 @@ version = "0.2.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e421abadd41a4225275504ea4d6566923418b7f05506fbc9c0fe86ba7396114b"
 
-[[package]]
-name = "typed-arena"
-version = "2.0.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6af6ae20167a9ece4bcb41af5b80f8a1f1df981f6391189ce00fd257af04126a"
-
 [[package]]
 name = "typenum"
 version = "1.17.0"
@@ -4106,9 +4086,9 @@ dependencies = [
 
 [[package]]
 name = "zip"
-version = "1.2.3"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c700ea425e148de30c29c580c1f9508b93ca57ad31c9f4e96b83c194c37a7a8f"
+checksum = "fccb210625924ecbbe92f9bb497d04b167b64fe5540cec75f10b16e0c51ee92b"
 dependencies = [
  "aes",
  "arbitrary",
@@ -4134,14 +4114,16 @@ dependencies = [
 
 [[package]]
 name = "zopfli"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5c1f48f3508a3a3f2faee01629564400bc12260f6214a056d06a3aaaa6ef0736"
+checksum = "e5019f391bac5cf252e93bbcc53d039ffd62c7bfb7c150414d61369afe57e946"
 dependencies = [
+ "bumpalo",
  "crc32fast",
+ "lockfree-object-pool",
  "log",
+ "once_cell",
  "simd-adler32",
- "typed-arena",
 ]
 
 [[package]]
diff --git a/geneit_backend/Cargo.toml b/geneit_backend/Cargo.toml
index c133f20..13bafbf 100644
--- a/geneit_backend/Cargo.toml
+++ b/geneit_backend/Cargo.toml
@@ -34,7 +34,7 @@ sha2 = "0.10.8"
 image = "0.25.1"
 uuid = { version = "1.8.0", features = ["v4"] }
 httpdate = "1.0.3"
-zip = "1.2.3"
+zip = "2.0.0"
 mime_guess = "2.0.4"
 tempfile = "3.10.1"
 base64 = "0.22.0"