diff --git a/Cargo.lock b/Cargo.lock
index a49ec9948a..7d07998e2f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -237,7 +237,7 @@ dependencies = [
  "anstyle",
  "bstr 1.6.0",
  "doc-comment",
- "predicates 3.0.4",
+ "predicates",
  "predicates-core",
  "predicates-tree",
  "wait-timeout",
@@ -3937,29 +3937,29 @@ dependencies = [
 
 [[package]]
 name = "mockall"
-version = "0.11.4"
+version = "0.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4c84490118f2ee2d74570d114f3d0493cbf02790df303d2707606c3e14e07c96"
+checksum = "1a978c8292954bcb9347a4e28772c0a0621166a1598fc1be28ac0076a4bb810e"
 dependencies = [
  "cfg-if",
  "downcast",
  "fragile",
  "lazy_static",
  "mockall_derive",
- "predicates 2.1.5",
+ "predicates",
  "predicates-tree",
 ]
 
 [[package]]
 name = "mockall_derive"
-version = "0.11.4"
+version = "0.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "22ce75669015c4f47b289fd4d4f56e894e4c96003ffdf3ac51313126f94c6cbb"
+checksum = "ad2765371d0978ba4ace4ebef047baa62fc068b431e468444b5610dd441c639b"
 dependencies = [
  "cfg-if",
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.32",
 ]
 
 [[package]]
@@ -5084,7 +5084,7 @@ dependencies = [
  "petgraph",
  "postgres-types",
  "ppv-lite86",
- "predicates 3.0.4",
+ "predicates",
  "proc-macro2",
  "rand 0.8.5",
  "rand_chacha 0.3.1",
@@ -6030,20 +6030,6 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "925383efa346730478fb4838dbe9137d2a47675ad789c546d150a6e1dd4ab31c"
 
-[[package]]
-name = "predicates"
-version = "2.1.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "59230a63c37f3e18569bdb90e4a89cbf5bf8b06fea0b84e65ea10cc4df47addd"
-dependencies = [
- "difflib",
- "float-cmp",
- "itertools 0.10.5",
- "normalize-line-endings",
- "predicates-core",
- "regex",
-]
-
 [[package]]
 name = "predicates"
 version = "3.0.4"
@@ -8982,7 +8968,7 @@ dependencies = [
  "omicron-common",
  "omicron-test-utils",
  "omicron-workspace-hack",
- "predicates 3.0.4",
+ "predicates",
  "slog",
  "slog-async",
  "slog-envlogger",
diff --git a/Cargo.toml b/Cargo.toml
index 9ed182e6c3..9fc450878b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -235,7 +235,7 @@ linear-map = "1.2.0"
 macaddr = { version = "1.0.1", features = ["serde_std"] }
 maplit = "1.0.2"
 mime_guess = "2.0.4"
-mockall = "0.11"
+mockall = "0.12"
 newtype_derive = "0.1.6"
 mg-admin-client = { path = "clients/mg-admin-client" }
 nexus-client = { path = "clients/nexus-client" }