diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 7bf4773..c6c6558 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -7,7 +7,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        postgres: [15, 14, 13, 12, 11, 10]
+        postgres: [15, 14, 13, 12, 11]
     steps:
       - uses: actions/checkout@v3
       - uses: ankane/setup-postgres@v1
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e444b74..ae20e26 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 - Changed text representation for vector elements to match `real`
 - Improved accuracy of text parsing for certain inputs
 - Added experimental support for Windows
+- Dropped support for Postgres 10
 
 ## 0.3.2 (2022-11-22)
 
diff --git a/META.json b/META.json
index 07326d6..85f02b5 100644
--- a/META.json
+++ b/META.json
@@ -12,7 +12,7 @@
 	"prereqs": {
 		"runtime": {
 			"requires": {
-				"PostgreSQL": "10.0.0"
+				"PostgreSQL": "11.0.0"
 			}
 		}
 	},
diff --git a/src/ivfbuild.c b/src/ivfbuild.c
index 03b9a29..8b3924a 100644
--- a/src/ivfbuild.c
+++ b/src/ivfbuild.c
@@ -22,13 +22,8 @@
 #define PROGRESS_CREATEIDX_TUPLES_DONE 0
 #endif
 
-#if PG_VERSION_NUM >= 110000
 #include "catalog/pg_operator_d.h"
 #include "catalog/pg_type_d.h"
-#else
-#include "catalog/pg_operator.h"
-#include "catalog/pg_type.h"
-#endif
 
 #if PG_VERSION_NUM >= 130000
 #define CALLBACK_ITEM_POINTER ItemPointer tid
@@ -117,12 +112,9 @@ SampleRows(IvfflatBuildState * buildstate)
 #if PG_VERSION_NUM >= 120000
 		table_index_build_range_scan(buildstate->heap, buildstate->index, buildstate->indexInfo,
 									 false, true, false, targblock, 1, SampleCallback, (void *) buildstate, NULL);
-#elif PG_VERSION_NUM >= 110000
-		IndexBuildHeapRangeScan(buildstate->heap, buildstate->index, buildstate->indexInfo,
-								false, true, targblock, 1, SampleCallback, (void *) buildstate, NULL);
 #else
 		IndexBuildHeapRangeScan(buildstate->heap, buildstate->index, buildstate->indexInfo,
-								false, true, targblock, 1, SampleCallback, (void *) buildstate);
+								false, true, targblock, 1, SampleCallback, (void *) buildstate, NULL);
 #endif
 	}
 }
@@ -327,11 +319,7 @@ InitBuildState(IvfflatBuildState * buildstate, Relation heap, Relation index, In
 #endif
 	TupleDescInitEntry(buildstate->tupdesc, (AttrNumber) 1, "list", INT4OID, -1, 0);
 	TupleDescInitEntry(buildstate->tupdesc, (AttrNumber) 2, "tid", TIDOID, -1, 0);
-#if PG_VERSION_NUM >= 110000
 	TupleDescInitEntry(buildstate->tupdesc, (AttrNumber) 3, "vector", RelationGetDescr(index)->attrs[0].atttypid, -1, 0);
-#else
-	TupleDescInitEntry(buildstate->tupdesc, (AttrNumber) 3, "vector", RelationGetDescr(index)->attrs[0]->atttypid, -1, 0);
-#endif
 
 #if PG_VERSION_NUM >= 120000
 	buildstate->slot = MakeSingleTupleTableSlot(buildstate->tupdesc, &TTSOpsVirtual);
@@ -531,11 +519,7 @@ CreateEntryPages(IvfflatBuildState * buildstate, ForkNumber forkNum)
 
 	UpdateProgress(PROGRESS_CREATEIDX_SUBPHASE, PROGRESS_IVFFLAT_PHASE_SORT);
 
-#if PG_VERSION_NUM >= 110000
 	buildstate->sortstate = tuplesort_begin_heap(buildstate->tupdesc, 1, attNums, sortOperators, sortCollations, nullsFirstFlags, maintenance_work_mem, NULL, false);
-#else
-	buildstate->sortstate = tuplesort_begin_heap(buildstate->tupdesc, 1, attNums, sortOperators, sortCollations, nullsFirstFlags, maintenance_work_mem, false);
-#endif
 
 	/* Add tuples to sort */
 	if (buildstate->heap != NULL)
@@ -543,12 +527,9 @@ CreateEntryPages(IvfflatBuildState * buildstate, ForkNumber forkNum)
 #if PG_VERSION_NUM >= 120000
 		buildstate->reltuples = table_index_build_scan(buildstate->heap, buildstate->index, buildstate->indexInfo,
 													   true, true, BuildCallback, (void *) buildstate, NULL);
-#elif PG_VERSION_NUM >= 110000
-		buildstate->reltuples = IndexBuildHeapScan(buildstate->heap, buildstate->index, buildstate->indexInfo,
-												   true, BuildCallback, (void *) buildstate, NULL);
 #else
 		buildstate->reltuples = IndexBuildHeapScan(buildstate->heap, buildstate->index, buildstate->indexInfo,
-												   true, BuildCallback, (void *) buildstate);
+												   true, BuildCallback, (void *) buildstate, NULL);
 #endif
 	}
 
diff --git a/src/ivfflat.c b/src/ivfflat.c
index 5ad3378..3731b28 100644
--- a/src/ivfflat.c
+++ b/src/ivfflat.c
@@ -181,9 +181,7 @@ ivfflathandler(PG_FUNCTION_ARGS)
 	amroutine->amclusterable = false;
 	amroutine->ampredlocks = false;
 	amroutine->amcanparallel = false;
-#if PG_VERSION_NUM >= 110000
 	amroutine->amcaninclude = false;
-#endif
 #if PG_VERSION_NUM >= 130000
 	amroutine->amusemaintenanceworkmem = false; /* not used during VACUUM */
 	amroutine->amparallelvacuumoptions = VACUUM_OPTION_PARALLEL_BULKDEL;
diff --git a/src/ivfscan.c b/src/ivfscan.c
index 1879bc4..108b4c5 100644
--- a/src/ivfscan.c
+++ b/src/ivfscan.c
@@ -7,13 +7,8 @@
 #include "miscadmin.h"
 #include "storage/bufmgr.h"
 
-#if PG_VERSION_NUM >= 110000
 #include "catalog/pg_operator_d.h"
 #include "catalog/pg_type_d.h"
-#else
-#include "catalog/pg_operator.h"
-#include "catalog/pg_type.h"
-#endif
 
 /*
  * Compare list distances
@@ -216,11 +211,7 @@ ivfflatbeginscan(Relation index, int nkeys, int norderbys)
 	TupleDescInitEntry(so->tupdesc, (AttrNumber) 3, "indexblkno", INT4OID, -1, 0);
 
 	/* Prep sort */
-#if PG_VERSION_NUM >= 110000
 	so->sortstate = tuplesort_begin_heap(so->tupdesc, 1, attNums, sortOperators, sortCollations, nullsFirstFlags, work_mem, NULL, false);
-#else
-	so->sortstate = tuplesort_begin_heap(so->tupdesc, 1, attNums, sortOperators, sortCollations, nullsFirstFlags, work_mem, false);
-#endif
 
 #if PG_VERSION_NUM >= 120000
 	so->slot = MakeSingleTupleTableSlot(so->tupdesc, &TTSOpsMinimalTuple);