diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8f9a5448..08269a16 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,14 @@
 # Changelog
 ## [Unreleased]
 
+## [0.26.1] - 2026-01-13
+
+### Fixed
+
+- **Docling Schema Version Mismatch**: Fixed incompatibility between `docling` and `docling-core` causing `ValidationError: Doc version 1.9.0 incompatible with SDK schema version 1.8.0` when adding documents ([#229](https://github.com/ggozad/haiku.rag/issues/229))
+  - Root cause: `docling-core` was reverted to 2.57.0 (schema 1.8.0) for docling-serve compatibility, but `docling` remained at 2.67.0 (schema 1.9.0)
+  - Fix: Reverted `docling` from 2.67.0 to 2.65.0 to match `docling-core` schema version
+
 ## [0.26.0] - 2026-01-13
 
 ### Added
diff --git a/app/backend/pyproject.toml b/app/backend/pyproject.toml
index 30130f80..031f4c9f 100644
--- a/app/backend/pyproject.toml
+++ b/app/backend/pyproject.toml
@@ -8,7 +8,7 @@ dependencies = [
     "uvicorn[standard]>=0.40.0",
     "pydantic-ai-slim[ag-ui,anthropic,openai]>=1.39.0",
     "python-dotenv>=1.2.1",
-    "haiku.rag-slim[agui]>=0.26.0",
+    "haiku.rag-slim[agui]>=0.26.1",
     "logfire[pydantic-ai]>=3.17.0",
 ]
 
diff --git a/evaluations/pyproject.toml b/evaluations/pyproject.toml
index 17920bf5..3ee96c95 100644
--- a/evaluations/pyproject.toml
+++ b/evaluations/pyproject.toml
@@ -2,7 +2,7 @@
 
 name = "haiku.rag-evals"
 description = "Benchmarking and evaluation scripts for haiku.rag"
-version = "0.26.0"
+version = "0.26.1"
 authors = [{ name = "Yiorgis Gozadinos", email = "ggozadinos@gmail.com" }]
 license = { text = "MIT" }
 requires-python = ">=3.12"
diff --git a/examples/a2a-server/pyproject.toml b/examples/a2a-server/pyproject.toml
index 440813e6..37d7c4b8 100644
--- a/examples/a2a-server/pyproject.toml
+++ b/examples/a2a-server/pyproject.toml
@@ -9,7 +9,7 @@ requires-python = ">=3.12"
 keywords = ["RAG", "a2a", "agent", "conversational-ai"]
 
 dependencies = [
-    "haiku.rag>=0.26.0",
+    "haiku.rag>=0.26.1",
     "fasta2a>=0.6.0",
     "pydantic-ai-slim[a2a]>=1.39.0",
     "rich>=14.2.0",
diff --git a/haiku_rag_slim/pyproject.toml b/haiku_rag_slim/pyproject.toml
index 4fb9918d..2ca5f3cb 100644
--- a/haiku_rag_slim/pyproject.toml
+++ b/haiku_rag_slim/pyproject.toml
@@ -2,7 +2,7 @@
 
 name = "haiku.rag-slim"
 description = "Opinionated agentic RAG powered by LanceDB, Pydantic AI, and Docling - Minimal dependencies"
-version = "0.26.0"
+version = "0.26.1"
 authors = [{ name = "Yiorgis Gozadinos", email = "ggozadinos@gmail.com" }]
 license = { text = "MIT" }
 readme = { file = "README.md", content-type = "text/markdown" }
diff --git a/pyproject.toml b/pyproject.toml
index bca28d59..cc80b0e0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,7 +2,7 @@
 
 name = "haiku.rag"
 description = "Opinionated agentic RAG powered by LanceDB, Pydantic AI, and Docling"
-version = "0.26.0"
+version = "0.26.1"
 authors = [{ name = "Yiorgis Gozadinos", email = "ggozadinos@gmail.com" }]
 license = { text = "MIT" }
 readme = { file = "README.md", content-type = "text/markdown" }
@@ -30,7 +30,7 @@ classifiers = [
 ]
 
 dependencies = [
-    "haiku.rag-slim[docling,voyageai,mxbai,cohere,zeroentropy,tui]==0.26.0",
+    "haiku.rag-slim[docling,voyageai,mxbai,cohere,zeroentropy,tui]==0.26.1",
 ]
 
 [project.scripts]
diff --git a/uv.lock b/uv.lock
index 39e2b7d5..26dff8c3 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1286,7 +1286,7 @@ wheels = [
 
 [[package]]
 name = "haiku-rag"
-version = "0.26.0"
+version = "0.26.1"
 source = { editable = "." }
 dependencies = [
     { name = "haiku-rag-slim", extra = ["cohere", "docling", "mxbai", "tui", "voyageai", "zeroentropy"] },
@@ -1341,7 +1341,7 @@ dev = [
 
 [[package]]
 name = "haiku-rag-evals"
-version = "0.26.0"
+version = "0.26.1"
 source = { editable = "evaluations" }
 dependencies = [
     { name = "datasets" },
@@ -1362,7 +1362,7 @@ requires-dist = [
 
 [[package]]
 name = "haiku-rag-slim"
-version = "0.26.0"
+version = "0.26.1"
 source = { editable = "haiku_rag_slim" }
 dependencies = [
     { name = "docling-core" },