diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index d36f9cac..35b46f00 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -24,6 +24,7 @@ Changelog
 **Other changes:**
 
 - When computing the covariance matrix, check for ill-conditionedness for all types of input. Furthermore, do it in a more efficient way.
+- Pin `tabmat<4.0.0` (the new release will bring breaking changes).
 
 2.5.2 - 2023-06-02
 ------------------
diff --git a/conda.recipe/meta.yaml b/conda.recipe/meta.yaml
index 79bee267..88349bea 100644
--- a/conda.recipe/meta.yaml
+++ b/conda.recipe/meta.yaml
@@ -35,7 +35,7 @@ requirements:
     - pandas
     - scikit-learn >=0.23
     - scipy
-    - tabmat >=3.1.0
+    - tabmat >=3.1.0, <4.0.0
 
 test:
   requires:
diff --git a/environment.yml b/environment.yml
index caf38614..198d8446 100644
--- a/environment.yml
+++ b/environment.yml
@@ -8,7 +8,7 @@ dependencies:
   - libblas>=0=*mkl  # comment this line out for macOS arm64
   - numexpr
   - pandas>=0.21
-  - tabmat>=3.1.0
+  - tabmat>=3.1.0, <4.0.0
   - scikit-learn>=0.23
   - scipy
   - tqdm
diff --git a/setup.py b/setup.py
index edc063f3..08f0eafd 100644
--- a/setup.py
+++ b/setup.py
@@ -85,7 +85,7 @@
         "pandas",
         "scikit-learn>=0.23",
         "scipy",
-        "tabmat>=3.1.0",
+        "tabmat>=3.1.0,<4.0.0",
     ],
     entry_points=None
     if os.environ.get("CONDA_BUILD")