diff --git a/Makefile b/Makefile
index 2b4b36e..7680762 100644
--- a/Makefile
+++ b/Makefile
@@ -21,7 +21,7 @@ DATA = pg_ivm--1.0.sql \
        pg_ivm--1.10.sql \
        pg_ivm--1.10--1.11.sql pg_ivm--1.11--1.12.sql
 
-REGRESS = pg_ivm create_immv refresh_immv
+REGRESS = pg_ivm create_immv refresh_immv preload_libraries_warning
 
 PGVER = $(shell $(PG_CONFIG) --version | sed "s/^[^ ]* \([0-9]*\).*$$/\1/" 2>/dev/null)
 
diff --git a/expected/pg_ivm.out b/expected/pg_ivm.out
index 841c7db..55348a7 100644
--- a/expected/pg_ivm.out
+++ b/expected/pg_ivm.out
@@ -1,3 +1,11 @@
+ALTER SYSTEM SET session_preload_libraries = pg_ivm;
+SELECT pg_reload_conf();
+ pg_reload_conf 
+----------------
+ t
+(1 row)
+
+\c -
 CREATE EXTENSION pg_ivm;
 GRANT ALL ON SCHEMA public TO public;
 -- create a table to use as a basis for views and materialized views in various combinations
diff --git a/expected/preload_libraries_warning.out b/expected/preload_libraries_warning.out
new file mode 100644
index 0000000..530e95f
--- /dev/null
+++ b/expected/preload_libraries_warning.out
@@ -0,0 +1,51 @@
+-- SQL tests to validate that the session_preload_libraries warning is emitted
+-- whenever pg_ivm is not in session_preload_libraries.
+DROP EXTENSION IF EXISTS pg_ivm CASCADE;
+NOTICE:  drop cascades to 12 other objects
+DETAIL:  drop cascades to trigger IVM_trigger_ins_before_17633 on table t
+drop cascades to trigger IVM_trigger_del_before_17634 on table t
+drop cascades to trigger IVM_trigger_upd_before_17635 on table t
+drop cascades to trigger IVM_trigger_truncate_before_17636 on table t
+drop cascades to trigger IVM_trigger_ins_after_17637 on table t
+drop cascades to trigger IVM_trigger_del_after_17638 on table t
+drop cascades to trigger IVM_trigger_upd_after_17639 on table t
+drop cascades to trigger IVM_trigger_truncate_after_17640 on table t
+drop cascades to trigger IVM_prevent_immv_change_17621 on table mv
+drop cascades to trigger IVM_prevent_immv_change_17622 on table mv
+drop cascades to trigger IVM_prevent_immv_change_17623 on table mv
+drop cascades to trigger IVM_prevent_immv_change_17624 on table mv
+-- Validate that pg_ivm 1.10 cannot be created if pg_ivm is not in
+-- session_preload_libraries.
+ALTER SYSTEM RESET session_preload_libraries;
+SELECT pg_reload_conf();
+ pg_reload_conf 
+----------------
+ t
+(1 row)
+
+\c -
+CREATE EXTENSION pg_ivm VERSION '1.9';  -- expect success
+ALTER EXTENSION pg_ivm UPDATE;          -- expect failure
+ERROR:  pg_ivm is not loaded in shared_preload_libraries or session_preload_libraries
+HINT:  Add pg_ivm to session_preload_libraries and restart the session. Or, add pg_ivm to shared_preload_libraries and restart Postgres.
+CONTEXT:  PL/pgSQL function inline_code_block line 13 at RAISE
+DROP EXTENSION pg_ivm;
+CREATE EXTENSION pg_ivm;                -- expect failure
+ERROR:  pg_ivm is not loaded in shared_preload_libraries or session_preload_libraries
+HINT:  Add pg_ivm to session_preload_libraries and restart the session. Or, add pg_ivm to shared_preload_libraries and restart Postgres.
+CONTEXT:  PL/pgSQL function inline_code_block line 13 at RAISE
+-- Validate that pg_ivm 1.10 can be created if pg_ivm is in
+-- session_preload_libraries.
+ALTER SYSTEM SET session_preload_libraries = pg_ivm;
+SELECT pg_reload_conf();
+ pg_reload_conf 
+----------------
+ t
+(1 row)
+
+\c -
+CREATE EXTENSION pg_ivm VERSION '1.9';  -- expect success
+ALTER EXTENSION pg_ivm UPDATE;          -- expect success
+DROP EXTENSION pg_ivm;
+CREATE EXTENSION pg_ivm;                -- expect success
+DROP EXTENSION pg_ivm CASCADE;
diff --git a/pg_ivm--1.10.sql b/pg_ivm--1.10.sql
index 98f0145..d7e1a27 100644
--- a/pg_ivm--1.10.sql
+++ b/pg_ivm--1.10.sql
@@ -1,3 +1,24 @@
+DO $$
+    DECLARE
+        shared_pl text;
+        session_pl text;
+    BEGIN
+        SELECT setting INTO shared_pl FROM pg_catalog.pg_settings
+        WHERE name = 'shared_preload_libraries';
+
+        SELECT setting INTO session_pl FROM pg_catalog.pg_settings
+        WHERE name = 'session_preload_libraries';
+
+        IF shared_pl !~ '\mpg_ivm\M' AND session_pl !~ '\mpg_ivm\M' THEN
+            RAISE EXCEPTION 'pg_ivm is not loaded in shared_preload_libraries '
+                'or session_preload_libraries'
+            USING HINT = 'Add pg_ivm to session_preload_libraries and '
+                'restart the session. Or, add pg_ivm to '
+                'shared_preload_libraries and restart Postgres.';
+        END IF;
+    END
+$$;
+
 CREATE SCHEMA pgivm;
 
 -- catalog
diff --git a/pg_ivm--1.9--1.10.sql b/pg_ivm--1.9--1.10.sql
index f117add..2f4e678 100644
--- a/pg_ivm--1.9--1.10.sql
+++ b/pg_ivm--1.9--1.10.sql
@@ -1,3 +1,24 @@
+DO $$
+    DECLARE
+        shared_pl text;
+        session_pl text;
+    BEGIN
+        SELECT setting INTO shared_pl FROM pg_catalog.pg_settings
+        WHERE name = 'shared_preload_libraries';
+
+        SELECT setting INTO session_pl FROM pg_catalog.pg_settings
+        WHERE name = 'session_preload_libraries';
+
+        IF shared_pl !~ '\mpg_ivm\M' AND session_pl !~ '\mpg_ivm\M' THEN
+            RAISE EXCEPTION 'pg_ivm is not loaded in shared_preload_libraries '
+                'or session_preload_libraries'
+            USING HINT = 'Add pg_ivm to session_preload_libraries and '
+                'restart the session. Or, add pg_ivm to '
+                'shared_preload_libraries and restart Postgres.';
+        END IF;
+    END
+$$;
+
 -- create a new schema pgivm and change the objects' schema to it
 CREATE SCHEMA pgivm;
 
diff --git a/sql/pg_ivm.sql b/sql/pg_ivm.sql
index d274bc3..51147f8 100644
--- a/sql/pg_ivm.sql
+++ b/sql/pg_ivm.sql
@@ -1,3 +1,7 @@
+ALTER SYSTEM SET session_preload_libraries = pg_ivm;
+SELECT pg_reload_conf();
+\c -
+
 CREATE EXTENSION pg_ivm;
 GRANT ALL ON SCHEMA public TO public;
 
diff --git a/sql/preload_libraries_warning.sql b/sql/preload_libraries_warning.sql
new file mode 100644
index 0000000..5d93534
--- /dev/null
+++ b/sql/preload_libraries_warning.sql
@@ -0,0 +1,28 @@
+-- SQL tests to validate that the session_preload_libraries warning is emitted
+-- whenever pg_ivm is not in session_preload_libraries.
+
+DROP EXTENSION IF EXISTS pg_ivm CASCADE;
+
+-- Validate that pg_ivm 1.10 cannot be created if pg_ivm is not in
+-- session_preload_libraries.
+ALTER SYSTEM RESET session_preload_libraries;
+SELECT pg_reload_conf();
+\c -
+
+CREATE EXTENSION pg_ivm VERSION '1.9';  -- expect success
+ALTER EXTENSION pg_ivm UPDATE;          -- expect failure
+DROP EXTENSION pg_ivm;
+CREATE EXTENSION pg_ivm;                -- expect failure
+
+-- Validate that pg_ivm 1.10 can be created if pg_ivm is in
+-- session_preload_libraries.
+ALTER SYSTEM SET session_preload_libraries = pg_ivm;
+SELECT pg_reload_conf();
+\c -
+
+CREATE EXTENSION pg_ivm VERSION '1.9';  -- expect success
+ALTER EXTENSION pg_ivm UPDATE;          -- expect success
+DROP EXTENSION pg_ivm;
+CREATE EXTENSION pg_ivm;                -- expect success
+
+DROP EXTENSION pg_ivm CASCADE;