diff --git a/Cargo.lock b/Cargo.lock
index aa259814b7..4cc0c17854 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1088,7 +1088,7 @@ checksum = "6dbf3de79e51f3d586ab4cb9d5c3e2c14aa28ed23d180cf89b4df0454a69cc87"
 
 [[package]]
 name = "hugr"
-version = "0.15.3"
+version = "0.15.4"
 dependencies = [
  "bumpalo",
  "criterion",
@@ -1102,7 +1102,7 @@ dependencies = [
 
 [[package]]
 name = "hugr-cli"
-version = "0.15.3"
+version = "0.15.4"
 dependencies = [
  "assert_cmd",
  "assert_fs",
@@ -1118,7 +1118,7 @@ dependencies = [
 
 [[package]]
 name = "hugr-core"
-version = "0.15.3"
+version = "0.15.4"
 dependencies = [
  "cgmath",
  "cool_asserts",
@@ -1156,7 +1156,7 @@ dependencies = [
 
 [[package]]
 name = "hugr-llvm"
-version = "0.15.3"
+version = "0.15.4"
 dependencies = [
  "anyhow",
  "delegate",
@@ -1175,7 +1175,7 @@ dependencies = [
 
 [[package]]
 name = "hugr-model"
-version = "0.19.0"
+version = "0.19.1"
 dependencies = [
  "base64",
  "bumpalo",
@@ -1199,7 +1199,7 @@ dependencies = [
 
 [[package]]
 name = "hugr-passes"
-version = "0.15.3"
+version = "0.15.4"
 dependencies = [
  "ascent",
  "derive_more",
diff --git a/hugr-cli/Cargo.toml b/hugr-cli/Cargo.toml
index 423b8c4632..dc956f32cb 100644
--- a/hugr-cli/Cargo.toml
+++ b/hugr-cli/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "hugr-cli"
-version = "0.15.3"
+version = "0.15.4"
 edition = { workspace = true }
 rust-version = { workspace = true }
 license = { workspace = true }
@@ -19,7 +19,7 @@ bench = false
 clap = { workspace = true, features = ["derive", "cargo"] }
 clap-verbosity-flag.workspace = true
 derive_more = { workspace = true, features = ["display", "error", "from"] }
-hugr = { path = "../hugr", version = "0.15.3" }
+hugr = { path = "../hugr", version = "0.15.4" }
 serde_json.workspace = true
 clio = { workspace = true, features = ["clap-parse"] }
 
diff --git a/hugr-core/CHANGELOG.md b/hugr-core/CHANGELOG.md
index 5071639709..eb7fd6736d 100644
--- a/hugr-core/CHANGELOG.md
+++ b/hugr-core/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## [0.15.4](https://github.com/CQCL/hugr/compare/hugr-core-v0.15.3...hugr-core-v0.15.4) - 2025-04-15
+
+### New Features
+
+- Export the portgraph hierarchy in HugrInternals ([#2057](https://github.com/CQCL/hugr/pull/2057))
+- Implement Debug for generic Wire<N>s ([#2068](https://github.com/CQCL/hugr/pull/2068))
+- Add ExtensionOp helpers ([#2072](https://github.com/CQCL/hugr/pull/2072))
+
 ## [0.15.3](https://github.com/CQCL/hugr/compare/hugr-core-v0.15.2...hugr-core-v0.15.3) - 2025-04-02
 
 ### Documentation
diff --git a/hugr-core/Cargo.toml b/hugr-core/Cargo.toml
index 22e5390fca..b5a7908ef0 100644
--- a/hugr-core/Cargo.toml
+++ b/hugr-core/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "hugr-core"
-version = "0.15.3"
+version = "0.15.4"
 edition = { workspace = true }
 rust-version = { workspace = true }
 
@@ -30,7 +30,7 @@ name = "model"
 required-features = ["model_unstable"]
 
 [dependencies]
-hugr-model = { version = "0.19.0", path = "../hugr-model", optional = true }
+hugr-model = { version = "0.19.1", path = "../hugr-model", optional = true }
 
 cgmath = { workspace = true, features = ["serde"] }
 delegate = { workspace = true }
diff --git a/hugr-llvm/Cargo.toml b/hugr-llvm/Cargo.toml
index dce479c599..9a9aaad5d9 100644
--- a/hugr-llvm/Cargo.toml
+++ b/hugr-llvm/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "hugr-llvm"
-version = "0.15.3"
+version = "0.15.4"
 description = "A general and extensible crate for lowering HUGRs into LLVM IR"
 
 edition.workspace = true
@@ -24,7 +24,7 @@ llvm14-0 = ["inkwell/llvm14-0"]
 
 [dependencies]
 inkwell = { version = "0.5.0", default-features = false }
-hugr-core = { path = "../hugr-core", version = "0.15.3" }
+hugr-core = { path = "../hugr-core", version = "0.15.4" }
 anyhow = "1.0.97"
 itertools.workspace = true
 delegate.workspace = true
diff --git a/hugr-model/Cargo.toml b/hugr-model/Cargo.toml
index 8effc8aa95..e781d59e14 100644
--- a/hugr-model/Cargo.toml
+++ b/hugr-model/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "hugr-model"
-version = "0.19.0"
+version = "0.19.1"
 readme = "README.md"
 documentation = "https://docs.rs/hugr-model/"
 description = "Data model for Quantinuum's HUGR intermediate representation"
diff --git a/hugr-passes/Cargo.toml b/hugr-passes/Cargo.toml
index 7a2c503670..5855b8fb19 100644
--- a/hugr-passes/Cargo.toml
+++ b/hugr-passes/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "hugr-passes"
-version = "0.15.3"
+version = "0.15.4"
 edition = { workspace = true }
 rust-version = { workspace = true }
 license = { workspace = true }
@@ -16,7 +16,7 @@ categories = ["compilers"]
 bench = false
 
 [dependencies]
-hugr-core = { path = "../hugr-core", version = "0.15.3" }
+hugr-core = { path = "../hugr-core", version = "0.15.4" }
 portgraph = { workspace = true }
 ascent = { version = "0.8.0" }
 derive_more = { workspace = true, features = ["display", "error", "from"] }
diff --git a/hugr/CHANGELOG.md b/hugr/CHANGELOG.md
index 5e639a13c5..b58553fe06 100644
--- a/hugr/CHANGELOG.md
+++ b/hugr/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## [0.15.4](https://github.com/CQCL/hugr/compare/hugr-v0.15.3...hugr-v0.15.4) - 2025-04-15
+
+### New Features
+
+- Export the portgraph hierarchy in HugrInternals ([#2057](https://github.com/CQCL/hugr/pull/2057))
+- Implement Debug for generic Wire<N>s ([#2068](https://github.com/CQCL/hugr/pull/2068))
+- Add ExtensionOp helpers ([#2072](https://github.com/CQCL/hugr/pull/2072))
+
 ## [0.15.3](https://github.com/CQCL/hugr/compare/hugr-v0.15.2...hugr-v0.15.3) - 2025-04-02
 
 ### Documentation
diff --git a/hugr/Cargo.toml b/hugr/Cargo.toml
index c0439a960a..a3f347ad93 100644
--- a/hugr/Cargo.toml
+++ b/hugr/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "hugr"
-version = "0.15.3"
+version = "0.15.4"
 edition = { workspace = true }
 rust-version = { workspace = true }
 
@@ -32,10 +32,10 @@ llvm-test = ["hugr-llvm/llvm14-0", "hugr-llvm/test-utils"]
 zstd = ["hugr-core/zstd"]
 
 [dependencies]
-hugr-model = { path = "../hugr-model", optional = true, version = "0.19.0" }
-hugr-core = { path = "../hugr-core", version = "0.15.3" }
-hugr-passes = { path = "../hugr-passes", version = "0.15.3" }
-hugr-llvm = { path = "../hugr-llvm", version = "0.15.3", optional = true }
+hugr-model = { path = "../hugr-model", optional = true, version = "0.19.1" }
+hugr-core = { path = "../hugr-core", version = "0.15.4" }
+hugr-passes = { path = "../hugr-passes", version = "0.15.4" }
+hugr-llvm = { path = "../hugr-llvm", version = "0.15.4", optional = true }
 
 [dev-dependencies]
 lazy_static = { workspace = true }