diff --git a/test/test_contact.jl b/test/test_contact.jl
index 0bcec16c..7ddf4a82 100644
--- a/test/test_contact.jl
+++ b/test/test_contact.jl
@@ -1,6 +1,6 @@
 @testset "contact" begin
     @testset "HalfSpace3D" begin
-        Random.seed!(1)
+        Random.seed!(4)
         frame = CartesianFrame3D()
         point = Point3D(frame, rand(), rand(), rand())
         normal = FreeVector3D(frame, 0., 0., 1.)
diff --git a/test/test_custom_collections.jl b/test/test_custom_collections.jl
index 061a5602..7e8ed5ea 100644
--- a/test/test_custom_collections.jl
+++ b/test/test_custom_collections.jl
@@ -63,7 +63,7 @@ Base.axes(m::NonOneBasedMatrix) = ((1:m.m) .- 2, (1:m.n) .+ 1)
     end
 
     @testset "SegmentedBlockDiagonalMatrix" begin
-        Random.seed!(1)
+        Random.seed!(5)
         A = rand(10, 10)
         block_indices = [(1:1, 1:1),  # square
                          (2:4, 2:2),  # non-square
diff --git a/test/test_double_pendulum.jl b/test/test_double_pendulum.jl
index 39028e94..25e4cce4 100644
--- a/test/test_double_pendulum.jl
+++ b/test/test_double_pendulum.jl
@@ -1,5 +1,5 @@
 @testset "double pendulum" begin
-    Random.seed!(1)
+    Random.seed!(6)
     lc1 = -0.5
     l1 = -1.
     m1 = 1.
diff --git a/test/test_frames.jl b/test/test_frames.jl
index 6baeac65..fff35c6e 100644
--- a/test/test_frames.jl
+++ b/test/test_frames.jl
@@ -1,5 +1,5 @@
 @testset "frames" begin
-    Random.seed!(1)
+    Random.seed!(7)
     f1name = "1"
     f1 = CartesianFrame3D(f1name)
     f2 = CartesianFrame3D()
diff --git a/test/test_graph.jl b/test/test_graph.jl
index 0668849f..b23e578d 100644
--- a/test/test_graph.jl
+++ b/test/test_graph.jl
@@ -2,7 +2,7 @@ Graphs.flip_direction(edge::Edge{Int32}) = Edge(-edge.data)
 
 @testset "graphs" begin
     @testset "disconnected" begin
-        Random.seed!(1)
+        Random.seed!(8)
         graph = DirectedGraph{Vertex{Int64}, Edge{Float64}}()
         verts = [Vertex(rand(Int64)) for i = 1 : 10]
         for v in verts
@@ -23,7 +23,7 @@ Graphs.flip_direction(edge::Edge{Int32}) = Edge(-edge.data)
 
 
     @testset "tree graph" begin
-        Random.seed!(1)
+        Random.seed!(9)
         graph = DirectedGraph{Vertex{Int64}, Edge{Float64}}()
         root = Vertex(rand(Int64))
         add_vertex!(graph, root)
@@ -51,7 +51,7 @@ Graphs.flip_direction(edge::Edge{Int32}) = Edge(-edge.data)
     end
 
     @testset "remove_vertex!" begin
-        Random.seed!(1)
+        Random.seed!(10)
         graph = DirectedGraph{Vertex{Int64}, Edge{Float64}}()
         edge = Edge(rand())
         add_edge!(graph, Vertex(rand(Int64)), Vertex(rand(Int64)), edge)
@@ -83,7 +83,7 @@ Graphs.flip_direction(edge::Edge{Int32}) = Edge(-edge.data)
     end
 
     @testset "remove_edge!" begin
-        Random.seed!(1)
+        Random.seed!(11)
         graph = DirectedGraph{Vertex{Int64}, Edge{Float64}}()
         for i = 1 : 100
             add_vertex!(graph, Vertex(i))
@@ -110,7 +110,7 @@ Graphs.flip_direction(edge::Edge{Int32}) = Edge(-edge.data)
     end
 
     @testset "rewire!" begin
-        Random.seed!(1)
+        Random.seed!(12)
         graph = DirectedGraph{Vertex{Int64}, Edge{Float64}}()
         for i = 1 : 100
             add_vertex!(graph, Vertex(i))
@@ -145,7 +145,7 @@ Graphs.flip_direction(edge::Edge{Int32}) = Edge(-edge.data)
     end
 
     @testset "replace_edge!" begin
-        Random.seed!(1)
+        Random.seed!(13)
         graph = DirectedGraph{Vertex{Int64}, Edge{Float64}}()
         for i = 1 : 100
             add_vertex!(graph, Vertex(i))
@@ -175,7 +175,7 @@ Graphs.flip_direction(edge::Edge{Int32}) = Edge(-edge.data)
     end
 
     @testset "SpanningTree" begin
-        Random.seed!(1)
+        Random.seed!(14)
         rootdata = 0
 
         # graph1: tree grown incrementally
@@ -327,7 +327,7 @@ Graphs.flip_direction(edge::Edge{Int32}) = Edge(-edge.data)
     end
 
     @testset "reindex!" begin
-        Random.seed!(1)
+        Random.seed!(15)
         graph = DirectedGraph{Vertex{Int64}, Edge{Float64}}()
         for i = 1 : 100
             add_vertex!(graph, Vertex(i))
@@ -345,7 +345,7 @@ Graphs.flip_direction(edge::Edge{Int32}) = Edge(-edge.data)
     end
 
     @testset "map-like constructor" begin
-        Random.seed!(1)
+        Random.seed!(16)
         graph = DirectedGraph{Vertex{Int32}, Edge{Float32}}()
         for i = Int32(1) : Int32(100)
             add_vertex!(graph, Vertex(i))