diff --git a/ext/ilios/ilios.c b/ext/ilios/ilios.c
index 72bdb64..77b35ab 100644
--- a/ext/ilios/ilios.c
+++ b/ext/ilios/ilios.c
@@ -58,6 +58,18 @@ static void ilios_free(void *ptr)
     }
 }
 
+/**
+ *  Sets the log level.
+ * Default is +LOG_ERROR+.
+ *
+ * @return [Cassandra] self.
+ */
+static VALUE cassandra_set_log_level(VALUE self, VALUE log_level)
+{
+    cass_log_set_level(NUM2INT(log_level));
+    return self;
+}
+
 void Init_ilios(void)
 {
     rb_ext_ractor_safe(true);
@@ -83,6 +95,15 @@ void Init_ilios(void)
     id_report_on_exception = rb_intern("report_on_exception=");
     sym_unsupported_column_type = ID2SYM(rb_intern("unsupported_column_type"));
 
+    rb_define_module_function(mCassandra, "log_level", cassandra_set_log_level, 1);
+    rb_define_const(mCassandra, "LOG_DISABLED", INT2NUM(CASS_LOG_DISABLED));
+    rb_define_const(mCassandra, "LOG_CRITICAL", INT2NUM(CASS_LOG_CRITICAL));
+    rb_define_const(mCassandra, "LOG_ERROR", INT2NUM(CASS_LOG_ERROR));
+    rb_define_const(mCassandra, "LOG_WARN", INT2NUM(CASS_LOG_WARN));
+    rb_define_const(mCassandra, "LOG_INFO", INT2NUM(CASS_LOG_INFO));
+    rb_define_const(mCassandra, "LOG_DEBUG", INT2NUM(CASS_LOG_DEBUG));
+    rb_define_const(mCassandra, "LOG_TRACE", INT2NUM(CASS_LOG_TRACE));
+
     Init_cluster();
     Init_session();
     Init_statement();
diff --git a/sig/ilios.rbs b/sig/ilios.rbs
index f9453e8..32a9385 100644
--- a/sig/ilios.rbs
+++ b/sig/ilios.rbs
@@ -2,6 +2,16 @@ module Ilios
   VERSION: String
 
   module Cassandra
+    LOG_DISABLED: Integer
+    LOG_CRITICAL: Integer
+    LOG_ERROR: Integer
+    LOG_WARN: Integer
+    LOG_INFO: Integer
+    LOG_DEBUG: Integer
+    LOG_TRACE: Integer
+
+    def self.log_level: (Integer log_level) -> self
+
     class Cluster
       PROTOCOL_VERSION_V1: Integer
       PROTOCOL_VERSION_V2: Integer
diff --git a/test/helper.rb b/test/helper.rb
index 6ab89f8..f2fbdb3 100644
--- a/test/helper.rb
+++ b/test/helper.rb
@@ -80,3 +80,5 @@ def verify_gc_compaction
 
 prepare_keyspace
 prepare_table
+
+Ilios::Cassandra.log_level(Ilios::Cassandra::LOG_TRACE)
diff --git a/test/test_cassandra.rb b/test/test_cassandra.rb
new file mode 100644
index 0000000..54686f0
--- /dev/null
+++ b/test/test_cassandra.rb
@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+require_relative 'helper'
+
+class CassandraTest < Minitest::Test
+  def test_log_level
+    assert_raises(TypeError) { Ilios::Cassandra.log_level(Object.new) }
+
+    Ilios::Cassandra.log_level(Ilios::Cassandra::LOG_DEBUG)
+    pass
+  end
+end