diff --git a/pymc_experimental/inference/smc/sampling.py b/pymc_experimental/inference/smc/sampling.py
index 5f8dcee6..c6d7a818 100644
--- a/pymc_experimental/inference/smc/sampling.py
+++ b/pymc_experimental/inference/smc/sampling.py
@@ -166,7 +166,7 @@ def sample_smc_blackjax(
         num_mcmc_steps,
         kernel,
         diagnosis,
-        total_iterations,
+        int(total_iterations),
         iterations_to_diagnose,
         inner_kernel_params,
         running_time,
@@ -198,13 +198,13 @@ def arviz_from_particles(model, particles):
     -------
     """
     n_particles = jax.tree_util.tree_flatten(particles)[0][0].shape[0]
-    by_varname = {k.name: v.squeeze()[np.newaxis, :] for k, v in zip(model.value_vars, particles)}
+    by_varname = {k.name: v for k, v in zip(model.value_vars, particles)}
     varnames = [v.name for v in model.value_vars]
     with model:
         strace = NDArray(name=model.name)
         strace.setup(n_particles, 0)
     for particle_index in range(0, n_particles):
-        strace.record(point={k: by_varname[k][0][particle_index] for k in varnames})
+        strace.record(point={k: by_varname[k][particle_index] for k in varnames})
         multitrace = MultiTrace((strace,))
     return to_inference_data(multitrace, log_likelihood=False)
 
@@ -295,14 +295,7 @@ def blackjax_particles_from_pymc_population(model, pymc_population):
 
     order_of_vars = model.value_vars
 
-    def _format(var):
-        variable = pymc_population[var.name]
-        if len(variable.shape) == 1:
-            return variable[:, np.newaxis]
-        else:
-            return variable
-
-    return [_format(var) for var in order_of_vars]
+    return [pymc_population[var.name] for var in order_of_vars]
 
 
 def add_to_inference_data(
@@ -384,7 +377,7 @@ def get_jaxified_particles_fn(model, graph_outputs):
     logp_fn = get_jaxified_graph(inputs=model.value_vars, outputs=[graph_outputs])
 
     def logp_fn_wrap(particles):
-        return logp_fn(*[p.squeeze() for p in particles])[0]
+        return logp_fn(*particles)[0]
 
     return logp_fn_wrap
 
diff --git a/pymc_experimental/tests/test_blackjax_smc.py b/pymc_experimental/tests/test_blackjax_smc.py
index 2cdcf067..4aa0027c 100644
--- a/pymc_experimental/tests/test_blackjax_smc.py
+++ b/pymc_experimental/tests/test_blackjax_smc.py
@@ -133,7 +133,7 @@ def test_blackjax_particles_from_pymc_population_univariate():
     model = fast_model()
     population = {"x": np.array([2, 3, 4])}
     blackjax_particles = blackjax_particles_from_pymc_population(model, population)
-    jax.tree.map(np.testing.assert_allclose, blackjax_particles, [np.array([[2], [3], [4]])])
+    jax.tree.map(np.testing.assert_allclose, blackjax_particles, [np.array([2, 3, 4])])
 
 
 def test_blackjax_particles_from_pymc_population_multivariate():
@@ -147,7 +147,7 @@ def test_blackjax_particles_from_pymc_population_multivariate():
     jax.tree.map(
         np.testing.assert_allclose,
         blackjax_particles,
-        [np.array([[0.34614613], [1.09163261], [-0.44526825]]), np.array([[1], [2], [3]])],
+        [np.array([0.34614613, 1.09163261, -0.44526825]), np.array([1, 2, 3])],
     )
 
 
@@ -168,7 +168,7 @@ def test_blackjax_particles_from_pymc_population_multivariable():
     population = {"x": np.array([[2, 3], [5, 6], [7, 9]]), "z": np.array([11, 12, 13])}
     blackjax_particles = blackjax_particles_from_pymc_population(model, population)
 
-    jax.tree.map(
+    jax.tree_map(
         np.testing.assert_allclose,
         blackjax_particles,
         [np.array([[2, 3], [5, 6], [7, 9]]), np.array([[11], [12], [13]])],
@@ -181,7 +181,7 @@ def test_arviz_from_particles():
     with model:
         inference_data = arviz_from_particles(model, particles)
 
-    assert inference_data.posterior.sizes == Frozen({"chain": 1, "draw": 3, "x_dim_0": 2})
+    assert inference_data.posterior.dims == Frozen({"chain": 1, "draw": 3, "x_dim_0": 2})
     assert inference_data.posterior.data_vars.dtypes == Frozen(
         {"x": dtype("float64"), "z": dtype("float64")}
     )
@@ -196,7 +196,7 @@ def test_get_jaxified_logprior():
     """
     logprior = get_jaxified_logprior(fast_model())
     for point in [-0.5, 0.0, 0.5]:
-        jax.tree.map(
+        jax.tree_map(
             np.testing.assert_allclose,
             jax.vmap(logprior)([np.array([point])]),
             np.log(scipy.stats.norm(0, 1).pdf(point)),
@@ -212,7 +212,7 @@ def test_get_jaxified_loglikelihood():
     """
     loglikelihood = get_jaxified_loglikelihood(fast_model())
     for point in [-0.5, 0.0, 0.5]:
-        jax.tree.map(
+        jax.tree_map(
             np.testing.assert_allclose,
             jax.vmap(loglikelihood)([np.array([point])]),
             np.log(scipy.stats.norm(point, 1).pdf(0)),