diff --git a/justfile b/justfile
index 6d6e2e2..54ea4d3 100644
--- a/justfile
+++ b/justfile
@@ -9,6 +9,8 @@ release version:
     version="{{version}}"
     tag="v${version}"
     versionfile="internal/cli/root.go"
+    mcpversionfile="mcp/pyproject.toml"
+    mcplockfile="mcp/uv.lock"
 
     if ! [[ "$version" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
         echo "error: '$version' is not valid semver (expected X.Y.Z)" >&2
@@ -28,22 +30,36 @@ release version:
 
     nix fmt
 
-    dirty="$(git status --porcelain -- ':!'"${versionfile}")"
+    dirty="$(git status --porcelain -- ':!'"${versionfile}" ':!'"${mcpversionfile}" ':!'"${mcplockfile}")"
     if [ -n "$dirty" ]; then
-        echo "error: working tree has changes outside ${versionfile}:" >&2
+        echo "error: working tree has changes outside version files:" >&2
         echo "$dirty" >&2
         exit 1
     fi
 
-    nix build
-
     sed -i -E "s/^(\s*version\s*=\s*)\"[^\"]+\"/\1\"${version}\"/" "${versionfile}"
     if ! grep -qE "version\s*=\s*\"${version}\"" "${versionfile}"; then
         echo "error: failed to update version in ${versionfile}" >&2
         exit 1
     fi
 
-    git add "${versionfile}"
+    sed -i -E "s/^(version = )\"[^\"]+\"/\1\"${version}\"/" "${mcpversionfile}"
+    if ! grep -qFx "version = \"${version}\"" "${mcpversionfile}"; then
+        echo "error: failed to update version in ${mcpversionfile}" >&2
+        exit 1
+    fi
+
+    (cd mcp && uv lock)
+    if ! grep -qFx "version = \"${version}\"" "${mcplockfile}"; then
+        echo "error: failed to update version in ${mcplockfile}" >&2
+        exit 1
+    fi
+
+    nix build
+    nix build .#tgmcp
+    (cd mcp && uv run --locked pytest)
+
+    git add "${versionfile}" "${mcpversionfile}" "${mcplockfile}"
     git commit -m "release: ${tag}"
     git tag -a "${tag}" -m "${tag}"
     git push upstream master "${tag}"
diff --git a/mcp/pyproject.toml b/mcp/pyproject.toml
index 31213d7..86e962a 100644
--- a/mcp/pyproject.toml
+++ b/mcp/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "tgmcp"
-version = "0.1.0"
+version = "0.6.0"
 description = "A typed MCP server for the tg Tangled client"
 readme = "README.md"
 authors = [
diff --git a/mcp/uv.lock b/mcp/uv.lock
index 295906a..e536b99 100644
--- a/mcp/uv.lock
+++ b/mcp/uv.lock
@@ -1080,7 +1080,7 @@ wheels = [
 
 [[package]]
 name = "tgmcp"
-version = "0.1.0"
+version = "0.6.0"
 source = { editable = "." }
 dependencies = [
     { name = "fastmcp" },