diff --git a/src/sparsevec.h b/src/sparsevec.h
index 8d5009c..ef4041b 100644
--- a/src/sparsevec.h
+++ b/src/sparsevec.h
@@ -3,7 +3,7 @@
 
 #include "fmgr.h"
 
-#define SPARSEVEC_MAX_DIM 100000
+#define SPARSEVEC_MAX_DIM 1000000
 #define SPARSEVEC_MAX_NNZ 16000
 
 /* Ensure values are aligned */
diff --git a/test/expected/sparsevec_input.out b/test/expected/sparsevec_input.out
index a654aa6..a918fe9 100644
--- a/test/expected/sparsevec_input.out
+++ b/test/expected/sparsevec_input.out
@@ -187,9 +187,9 @@ SELECT '{}/-1'::sparsevec;
 ERROR:  sparsevec must have at least 1 dimension
 LINE 1: SELECT '{}/-1'::sparsevec;
                ^
-SELECT '{}/100001'::sparsevec;
-ERROR:  sparsevec cannot have more than 100000 dimensions
-LINE 1: SELECT '{}/100001'::sparsevec;
+SELECT '{}/1000001'::sparsevec;
+ERROR:  sparsevec cannot have more than 1000000 dimensions
+LINE 1: SELECT '{}/1000001'::sparsevec;
                ^
 SELECT '{0:1}/1'::sparsevec;
 ERROR:  index "0" is out of range for type sparsevec
@@ -219,7 +219,7 @@ SELECT '{}/3'::sparsevec(0);
 ERROR:  dimensions for type sparsevec must be at least 1
 LINE 1: SELECT '{}/3'::sparsevec(0);
                        ^
-SELECT '{}/3'::sparsevec(100001);
-ERROR:  dimensions for type sparsevec cannot exceed 100000
-LINE 1: SELECT '{}/3'::sparsevec(100001);
+SELECT '{}/3'::sparsevec(1000001);
+ERROR:  dimensions for type sparsevec cannot exceed 1000000
+LINE 1: SELECT '{}/3'::sparsevec(1000001);
                        ^
diff --git a/test/sql/sparsevec_input.sql b/test/sql/sparsevec_input.sql
index 4b665bf..cbf793e 100644
--- a/test/sql/sparsevec_input.sql
+++ b/test/sql/sparsevec_input.sql
@@ -38,7 +38,7 @@ SELECT '{1:1,1:1}/2'::sparsevec;
 SELECT '{1:1,2:1,1:1}/2'::sparsevec;
 SELECT '{}/5'::sparsevec;
 SELECT '{}/-1'::sparsevec;
-SELECT '{}/100001'::sparsevec;
+SELECT '{}/1000001'::sparsevec;
 SELECT '{0:1}/1'::sparsevec;
 SELECT '{2:1}/1'::sparsevec;
 
@@ -47,4 +47,4 @@ SELECT '{}/3'::sparsevec(2);
 SELECT '{}/3'::sparsevec(3, 2);
 SELECT '{}/3'::sparsevec('a');
 SELECT '{}/3'::sparsevec(0);
-SELECT '{}/3'::sparsevec(100001);
+SELECT '{}/3'::sparsevec(1000001);